18章总结—Swing程序设计

例题1

package admi;

import java.awt.*;
import javax.swing.*;
public class JFreamTest {
   public static void main(String[] args) {
       JFrame jf=new JFrame();
       jf.setTitle("创建一个JFrame窗体");
       Container container=jf.getContentPane();
       JLabel jl =new JLabel("这是一个JFrame窗体");
       jl.setHorizontalAlignment(SwingConstants.CENTER);
       container.add(jl);
       jf.setSize(300,150);
       jf.setLocation(320,240);
       jf.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
       jf.setVisible(true);
   }
}

例题2

package shiba;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

class MyJDialog extends JDialog {
   public MyJDialog(MyFrame frame) {
       super(frame,"第一个JDialog窗体",true);
       Container container=getContentPane();
       container.add(new JLabel("这是一个对话框"));
       setBounds(120,120,100,100);
   }
}
public class MyFrame extends JFrame{
   public MyFrame() {
       Container container =getContentPane();
       container.setLayout(null);
       JButton bl = new JButton("弹出对话框");
       bl.setBounds(10,10,100,21);
       bl.addActionListener(new ActionListener(){
           public void actionPerformed(ActionEvent e) {
           MyJDialog dialog = new MyJDialog(MyFrame.this);
           dialog.setVisible(true);
       }
   });
       container.add(bl);
       setSize(200,200);
       setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
       setVisible(true);
   }
public static void main(String args[]) {
   new MyFrame();
}}

例题3

package sh;

import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JOptionPane;

public class Demo {
   public static void main(String[] args) {
       Object o[]= {new JButton("是的"),new JButton("再想想")};
       Icon icon =new ImageIcon("src/注意.png");
       JOptionPane.showOptionDialog(null,
               "你做好准备了吗？",
               "注意了！",
               JOptionPane.DEFAULT_OPTION,
               JOptionPane.DEFAULT_OPTION,
               icon, o, null);
   }
}

例题4

package shiba;

import javax.swing.JOptionPane;

public class Demo4 {
   public static void main(String[] args) {
       int answer =JOptionPane.showConfirmDialog
               (null,
                       "确定离开吗？",
                       "标题",
                       JOptionPane.YES_NO_CANCEL_OPTION);
   }
}

例题5

         package shiba;

import javax.swing.JOptionPane;

public class Demo5 {
   public static void main(String[] args) {
       String name =JOptionPane.showInputDialog
               (null,
                       "请输入您的名字");
   }
}

例题6

package shiba;

import javax.swing.JOptionPane;

public class Demo6 {
   public static void main(String[] args) {
       JOptionPane.showConfirmDialog
       (null,
               "您与服务器断开了连接",
               "发生错误",
               JOptionPane.ERROR_MESSAGE);
   }
}

例题7

package shiba;

import java.awt.Container;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.WindowConstants;

public class AbsolutePosition extends JFrame {
   public AbsolutePosition() {
       setTitle("本窗体使用绝对布局");
       setLayout(null);
       setBounds(0,0,300,150);
       Container c=getContentPane();
       JButton b1 =new JButton("按钮1");
       JButton b2 =new JButton("按钮2");
       b1.setBounds(10, 30, 80, 30);
       b2.setBounds(60,70, 100, 20);
       c.add(b1);
       c.add(b2);
       setVisible(true);
       setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
   }
   public static void main(String[] args) {
       new AbsolutePosition();
   }
}

例题8

package shiba;

import java.awt.Container;
import java.awt.FlowLayout;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.WindowConstants;

public class FlowLayoutPosition   extends JFrame {
   public FlowLayoutPosition() {
       setTitle("本窗体使用流布局管理器");
       Container c =getContentPane();
       setLayout(new FlowLayout(FlowLayout.RIGHT,10,10));
       for(int i=0;i<10;i++) {
           c.add(new JButton("button"+i));
       }
       setSize(3300,200);
       setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
       setFocusable(true);
   }
   public static void main(String[] args) {
       new FlowLayoutPosition();
   }
}

例题9

package shiba;

import java.awt.BorderLayout;
import java.awt.Container;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.WindowConstants;

public class BorderLayoutPosition extends JFrame {
   public BorderLayoutPosition() {
       setTitle("这个窗体使用边界布局管理器");
       Container c=getContentPane();
       setLayout(new BorderLayout());
       JButton centerBtn =new JButton("中");
       JButton northBtn =new JButton("北");
       JButton southBtn =new JButton("南");
       JButton westBtn =new JButton("西");
       JButton eastBtn =new JButton("东");
       c.add(centerBtn,BorderLayout.CENTER);
       c.add(northBtn,BorderLayout.NORTH);
       c.add(southBtn,BorderLayout.SOUTH);
       c.add(westBtn,BorderLayout.WEST);
       c.add(eastBtn,BorderLayout.EAST);
       setSize(350,200);
       setVisible(true);
       setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
   }
   public static void main(String[] args) {
       new BorderLayoutPosition();
   }
}

例题10

package shiba;

import java.awt.Container;
import java.awt.GridLayout;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.WindowConstants;

public class GridLayoutPostiton extends JFrame {
   public GridLayoutPostiton() {
       Container c=getContentPane();
       setLayout(new GridLayout(7,3,5,5));
       for(int i=0;i<20;i++) {
           c.add(new JButton("button"+i));
       }
       setSize(300,300);
       setTitle("这是一个使用网格布局管理器的窗体");
       setVisible(true);
       setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
   }
   public static void main(String[] args) {
       new GridLayoutPostiton();
   }
}

例题11

package shiba;

import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.GridLayout;

import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.WindowConstants;

public class JPanelTest extends JFrame {
   public JPanelTest() {
       Container c =getContentPane();
       //将整个容器设置为2行2列的网格布局，组件水平间隔10像素，垂直间隔10像素
       c.setLayout(new GridLayout(2,2,10,10));
       //初始化一个面板，此面板使用1行4列的网格布局，组件水平间隔10像素，垂直间隔10像素
       JPanel p1 =new JPanel(new GridLayout(1,4,10,10));
       //初始化一个面板，此面板使用边界布局
       JPanel p2 =new JPanel(new BorderLayout());
       //初始化一个面板，此面板使用1行2列的网格布局，组件水平间隔10像素，垂直间隔10像素
       JPanel p3 =new JPanel(new GridLayout(1,2,10,10));
       //初始化一个面板，此面板使用2行1列的网格布局，组件水平间隔10像素，垂直间隔10像素
       JPanel p4 =new JPanel(new GridLayout(2,1,10,10));
       //给每个面板都添加边框和标题，使用BorderFactory 工厂类生成带标题的边框对象
       p1.setBorder(BorderFactory.createTitledBorder("面板1"));
       p2.setBorder(BorderFactory.createTitledBorder("面板2"));
       p3.setBorder(BorderFactory.createTitledBorder("面板3"));
       p4.setBorder(BorderFactory.createTitledBorder("面板4"));
       //向面板1中添加按钮
       p1.add(new JButton("b1"));
       p1.add(new JButton("b1"));
       p1.add(new JButton("b1"));
       p1.add(new JButton("b1"));
       //向面板2中添加按钮
       p2.add(new JButton("b2"),BorderLayout.WEST);
       p2.add(new JButton("b2"),BorderLayout.EAST);
       p2.add(new JButton("b2"),BorderLayout.NORTH);
       p2.add(new JButton("b2"),BorderLayout.SOUTH);
       p2.add(new JButton("b2"),BorderLayout.CENTER);
       //向面板3中添加按钮
       p3.add(new JButton("b3"));
       p3.add(new JButton("b3"));
       //向面板4中添加按钮
       p4.add(new JButton("b4"));
       p4.add(new JButton("b4"));
       //向容器中添加面板
       c.add(p1);
       c.add(p2);
       c.add(p3);
       c.add(p4);
       setTitle("在这个窗体中使用了面板");
       setSize(500,300);//窗体宽高
       setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);//关闭动作
   }
   public static void main(String[] args) {
       JPanelTest test=new JPanelTest();
       test.setVisible(true);
   }
}

例题12

import java.awt.Container;

import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.WindowConstants;

public class JScrollPaneTest extends JFrame{
   public JScrollPaneTest() {
       Container c = getContentPane();
       JTextArea ta = new JTextArea(20, 50);
       JScrollPane sp = new JScrollPane(ta);
       c.add(sp);
       setTitle("带滚动条的文字编译器");
       setSize(400, 200);
       setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
   }

   public static void main(String[] args) {
       JScrollPaneTest test = new JScrollPaneTest();
       test.setVisible(true);
   }
}

18.5:文字标签组件与图标

18.5.1：JLabel标签

package eightth;

import java.awt.Container;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.WindowConstants;

public class JLabelTest extends JFrame {
   public JLabelTest() {
       Container container = getContentPane();
       // 创建一个标签
       JLabel jl = new JLabel("这是一个JFrame窗体");
       container.add(jl); // 将标签添加到容器中
       setSize(200, 100); // 设置窗体大小
       // 设置窗体关闭模式
       setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
       setVisible(true); // 使窗体可见
   }

   public static void main(String args[]) {
       new JLabelTest(); // 创建MyImageIcon对象
   }
}
//例题18.13

18.5.2：图标的使用

package eightth;

import java.awt.Container;
import java.net.URL;

import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.SwingConstants;
import javax.swing.WindowConstants;

public class MyImageIcon extends JFrame {
   public MyImageIcon() {
       Container container = getContentPane();
       //创建一个标签
       JLabel jl = new JLabel("这是一个JFrame窗体", JLabel.CENTER);
       //获取图片所在的URL
       URL url = MyImageIcon.class.getResource("pic.png");
       Icon icon = new ImageIcon(url);        //创建Icon对象
       jl.setIcon(icon);                        //为标签设置图片
       //设置文字放置在标签中间
       jl.setHorizontalAlignment(SwingConstants.CENTER);
       jl.setOpaque(true);                    //设置标签为不透明状态
       container.add(jl);                        //将标签添加到容器中
       setSize(300, 200);                        //设置窗体大小
       setVisible(true);                        //使窗体可见
       //设置窗体关闭模式
       setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
   }
   public static void main(String args[]) {
       new MyImageIcon();                        //创建MyImageIcon对象
   }
}
//例题18.14

18.6：按钮组件

18.6.1：JButton按钮

package eightth;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class JButtonTest extends JFrame {
   public JButtonTest() {
       Icon icon = new ImageIcon("src/imageButtoo.jpg"); // 获取图片文件
       setLayout(new GridLayout(3, 2, 5, 5)); // 设置网格布局管理器
       Container c = getContentPane(); // 获取主容器
       JButton btn[] = new JButton[6]; // 创建按钮数组
       for (int i = 0; i < btn.length; i++) {
           btn[i] = new JButton(); // 实例化数组中的对象
           c.add(btn[i]); // 将按钮添加到容器中
       }
       btn[0].setText("不可用");
       btn[0].setEnabled(false); // 设置按钮不可用
       btn[1].setText("有背景色");
       btn[1].setBackground(Color.YELLOW);
       btn[2].setText("无边框");
       btn[2].setBorderPainted(false); // 设置按钮边框不显示
       btn[3].setText("有边框");
       btn[3].setBorder(BorderFactory.createLineBorder(Color.RED)); // 添加红色线型边框
       btn[4].setIcon(icon); // 为按钮设置图标
       btn[4].setToolTipText("图片按钮"); // 设置鼠标悬停时提示的文字
       btn[5].setText("可点击");
       btn[5].addActionListener(new ActionListener() { // 为按钮添加监听事件
           public void actionPerformed(ActionEvent e) {
               JOptionPane.showMessageDialog(JButtonTest.this, "点击按钮"); // 弹出确认对话框
           }
       });
       setDefaultCloseOperation(EXIT_ON_CLOSE);
       setVisible(true);
       setTitle("创建不同样式的按钮");
       setBounds(100, 100, 400, 200);
   }

   public static void main(String[] args) {
       new JButtonTest();
   }
}
//例题18.15package eightth;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class JButtonTest extends JFrame {
   public JButtonTest() {
       Icon icon = new ImageIcon("src/imageButtoo.jpg"); // 获取图片文件
       setLayout(new GridLayout(3, 2, 5, 5)); // 设置网格布局管理器
       Container c = getContentPane(); // 获取主容器
       JButton btn[] = new JButton[6]; // 创建按钮数组
       for (int i = 0; i < btn.length; i++) {
           btn[i] = new JButton(); // 实例化数组中的对象
           c.add(btn[i]); // 将按钮添加到容器中
       }
       btn[0].setText("不可用");
       btn[0].setEnabled(false); // 设置按钮不可用
       btn[1].setText("有背景色");
       btn[1].setBackground(Color.YELLOW);
       btn[2].setText("无边框");
       btn[2].setBorderPainted(false); // 设置按钮边框不显示
       btn[3].setText("有边框");
       btn[3].setBorder(BorderFactory.createLineBorder(Color.RED)); // 添加红色线型边框
       btn[4].setIcon(icon); // 为按钮设置图标
       btn[4].setToolTipText("图片按钮"); // 设置鼠标悬停时提示的文字
       btn[5].setText("可点击");
       btn[5].addActionListener(new ActionListener() { // 为按钮添加监听事件
           public void actionPerformed(ActionEvent e) {
               JOptionPane.showMessageDialog(JButtonTest.this, "点击按钮"); // 弹出确认对话框
           }
       });
       setDefaultCloseOperation(EXIT_ON_CLOSE);
       setVisible(true);
       setTitle("创建不同样式的按钮");
       setBounds(100, 100, 400, 200);
   }

   public static void main(String[] args) {
       new JButtonTest();
   }
}
//例题18.15

JRadioButton单选按钮

package eightth;

import javax.swing.*;

public class RadioButtonTest extends JFrame {
   public RadioButtonTest() {
       setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
       setTitle("单选按钮的使用");
       setBounds(100, 100, 240, 120);
       getContentPane().setLayout(null); // 设置绝对布局
       JLabel lblNewLabel = new JLabel("请选择性别：");
       lblNewLabel.setBounds(5, 5, 120, 15);
       getContentPane().add(lblNewLabel);
       JRadioButton rbtnNormal = new JRadioButton("男");
       rbtnNormal.setSelected(true);
       rbtnNormal.setBounds(40, 30, 75, 22);
       getContentPane().add(rbtnNormal);
       JRadioButton rbtnPwd = new JRadioButton("女");
       rbtnPwd.setBounds(120, 30, 75, 22);
       getContentPane().add(rbtnPwd);
       // 创建按钮组，把交互面板中的单选按钮添加到按钮组中
       ButtonGroup group = new ButtonGroup();
       group.add(rbtnNormal);
       group.add(rbtnPwd);
   }

   public static void main(String[] args) {
       RadioButtonTest frame = new RadioButtonTest(); // 创建窗体对象
       frame.setVisible(true); // 使窗体可见
   }
}
//例题18.16

18.6.3：JCheckBox

package eightth;

import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFrame;

public class CheckBoxTest extends JFrame {
   public CheckBoxTest() {
       setBounds(100, 100, 170, 110); // 窗口坐标和大小
       setDefaultCloseOperation(EXIT_ON_CLOSE);
       Container c = getContentPane(); // 获取主容器
       c.setLayout(new FlowLayout()); // 容器使用流布局
       JCheckBox c1 = new JCheckBox("1"); // 创建复选框
       JCheckBox c2 = new JCheckBox("2");
       JCheckBox c3 = new JCheckBox("3");
       c.add(c1); // 容器添加复选框
       c.add(c2);
       c.add(c3);
       JButton btn = new JButton("打印"); // 创建打印按钮
       btn.addActionListener(new ActionListener() { // 打印按钮动作事件
           public void actionPerformed(ActionEvent e) {
               // 在控制台分别输出三个复选框的选中状态
               System.out.println(c1.getText() + "按钮选中状态：" + c1.isSelected());
               System.out.println(c2.getText() + "按钮选中状态：" + c2.isSelected());
               System.out.println(c3.getText() + "按钮选中状态：" + c3.isSelected());
           }
       });
       c.add(btn); // 容器添加打印按钮
       setVisible(true);
   }

   public static void main(String[] args) {
       new CheckBoxTest();
   }
}

//例题18.17

选中之后控制台会返回真或者假

18.7：列表组件

18.7.1：JComboBox下拉列表框

package eightth;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;

public class JComboBoxTest extends JFrame {
   public JComboBoxTest() {
       setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
       setTitle("下拉列表框的使用");
       setBounds(100, 100, 317, 147);
       getContentPane().setLayout(null); // 设置绝对布局
       JLabel lblNewLabel = new JLabel("请选择证件：");
       lblNewLabel.setBounds(28, 14, 80, 15);
       getContentPane().add(lblNewLabel);
       JComboBox<String> comboBox = new JComboBox<String>(); // 创建一个下拉列表框
       comboBox.setBounds(110, 11, 80, 21); // 设置坐标
       comboBox.addItem("身份证"); // 为下拉列表中添加项
       comboBox.addItem("军人证");
       comboBox.addItem("学生证");
       comboBox.addItem("工作证");
       comboBox.setEditable(true);
       getContentPane().add(comboBox); // 将下拉列表添加到容器中
       JLabel lblResult = new JLabel("");
       lblResult.setBounds(0, 57, 146, 15);
       getContentPane().add(lblResult);
       JButton btnNewButton = new JButton("确定");
       btnNewButton.setBounds(200, 10, 67, 23);
       getContentPane().add(btnNewButton);
       btnNewButton.addActionListener(new ActionListener() { // 为按钮添加监听事件
           @Override
           public void actionPerformed(ActionEvent arg0) {
               // 获取下拉列表中的选中项
               lblResult.setText("您选择的是：" + comboBox.getSelectedItem());
           }
       });
   }

   public static void main(String[] args) {
       JComboBoxTest frame = new JComboBoxTest(); // 创建窗体对象
       frame.setVisible(true); // 使窗体可见
   }
}//例题18.18

18.7.2：JList列表框

package eightth;
import java.awt.Container;
import java.awt.event.*;
import javax.swing.*;

public class JListTest extends JFrame {
   public JListTest() {
       Container cp = getContentPane(); // 获取窗体主容器
       cp.setLayout(null); // 容器使用绝对布局
       // 创建字符串数组，保存列表的中的数据
       String[] contents = { "列表1", "列表2", "列表3", "列表4", "列表5", "列表6" };
       JList<String> jl = new JList<>(contents); // 创建列表，并将数据作为构造参数
       JScrollPane js = new JScrollPane(jl); // 将列表放入滚动面板
       js.setBounds(10, 10, 100, 109); // 设定滚动面板的坐标和大小
       cp.add(js);
       JTextArea area = new JTextArea(); // 创建文本域
       JScrollPane scrollPane = new JScrollPane(area); // 将文本域放入滚动面板
       scrollPane.setBounds(118, 10, 73, 80); // 设定滚动面板的坐标和大小
       cp.add(scrollPane);
       JButton btnNewButton = new JButton("确认"); // 创建确认按钮
       btnNewButton.setBounds(120, 96, 71, 23); // 设定按钮的坐标和大小
       cp.add(btnNewButton);
       btnNewButton.addActionListener(new ActionListener() { // 添加按钮事件
           public void actionPerformed(ActionEvent e) {
               // 获取列表中选中的元素，返回java.util.List类型
               java.util.List<String> values = jl.getSelectedValuesList();
               area.setText(""); // 清空文本域
               for (String value : values) {
                   area.append(value + "\n"); // 在文本域循环追加List中的元素值
               }
           }
       });
       setTitle("在这个窗体中使用了列表框");
       setSize(217, 167);
       setVisible(true);
       setDefaultCloseOperation(EXIT_ON_CLOSE);
   }

   public static void main(String args[]) {
       new JListTest();
   }
}
//例题18.19

18.8：文本组件

18.8.1：JTextField文本框

package eightth;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class JTextFieldTest extends JFrame {
public JTextFieldTest() {
Container c = getContentPane(); // 获取窗体主容器
c.setLayout(new FlowLayout());
JTextField jt = new JTextField("请点击清除按钮"); // 设定文本框初始值
jt.setColumns(20); // 设置文本框长度
jt.setFont(new Font("宋体", Font.PLAIN, 20)); // 设置字体
JButton jb = new JButton("清除");
jt.addActionListener(new ActionListener() { // 为文本框添加回车事件
public void actionPerformed(ActionEvent arg0) {
jt.setText("触发事件"); // 设置文本框中的值
}
});
jb.addActionListener(new ActionListener() { // 为按钮添加事件
public void actionPerformed(ActionEvent arg0) {
System.out.println(jt.getText()); // 输出当前文本框的值
jt.setText(""); // 将文本框置空
jt.requestFocus(); // 焦点回到文本框
}
});
c.add(jt); // 窗体容器添加文本框
c.add(jb); // 窗体添加按钮
setBounds(100, 100, 250, 110);
setVisible(true);
setDefaultCloseOperation(EXIT_ON_CLOSE);
}
public static void main(String[] args) {
new JTextFieldTest();
}
}

//例题18.20

在窗体输入后控制台会输出内容

18.8.2：JPasswordField密码框

密码框组件由JPasswordField对象表示，其作用是吧用户输入的字符串以某种符号进行加密。

package eightth;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JLabel;
import javax.swing.JOptionPane;

import java.awt.Font;
import javax.swing.JTextField;
import javax.swing.SwingConstants;
import javax.swing.JButton;
import javax.swing.JPasswordField;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.ImageIcon;
import java.awt.Color;

public class mima extends JFrame { // 创建一个“登录”类，并继承JFrame
   // 声明窗体中的组件
   private JPanel contentPane;
   private JPasswordField passwordField;
   private JLabel lblBanner;
   //主方法
   public static void main(String[] args) {
       mima frame = new mima(); // 创建密码对象
       frame.setVisible(true); // 使frame可视
   }
   //创建JFrame窗体

   public mima() { // Login的构造方法
       setResizable(false); // 不可改变窗体大小
       setTitle("密码框"); // 设置窗体题目
       setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // 设置窗体关闭的方式
       setBounds(80, 80, 406, 289); // 设置窗体大小
       //创建JPanel面板contentPane置于JFrame窗体中，并设置面板的边距和布局
       contentPane = new JPanel();
       contentPane.setBackground(Color.WHITE);
       contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));//边界
       setContentPane(contentPane);
       contentPane.setLayout(null);
       // 创建标签lblPwd置于面板contentPane中，设置标签的大小以及标签中字体的内容、样式
       JLabel lblPwd = new JLabel("密码：");
       lblPwd.setHorizontalAlignment(SwingConstants.RIGHT);
       lblPwd.setFont(new Font("幼圆", Font.PLAIN, 16));
       lblPwd.setBounds(125, 175, 54, 15);
       contentPane.add(lblPwd);
       //创建密码框置于面板contentPane中，设置密码框的大小
       passwordField = new JPasswordField();
       passwordField.setBounds(180, 172, 156, 21);
       contentPane.add(passwordField);

   }
}

18..3：JTextArea文本域

18.9.3：维护表格模型

package eightth;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.table.*;
public class AddAndDeleteDemo extends JFrame {
private DefaultTableModel tableModel; // 定义表格模型对象
private JTable table; // 定义表格对象
private JTextField aTextField;
private JTextField bTextField;
public static void main(String args[]) {
AddAndDeleteDemo frame = new AddAndDeleteDemo();
frame.setVisible(true);
}
public AddAndDeleteDemo() {
setTitle("维护表格模型");
setBounds(100, 100, 530, 200);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
final JScrollPane scrollPane = new JScrollPane();
getContentPane().add(scrollPane, BorderLayout.CENTER);
String[] columnNames = {"A", "B"}; // 定义表格列名数组
// 定义表格数据数组
String[][] tableValues = {{"A1", "B1"}, {"A2", "B2"}, {"A3", "B3"}};
// 创建指定表格列名和表格数据的表格模型
tableModel = new DefaultTableModel(tableValues, columnNames);
table = new JTable(tableModel); // 创建指定表格模型的表格
table.setRowSorter(new TableRowSorter<>(tableModel)); // 设置表格的排序器
// 设置表格的选择模式为单选
table.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
// 为表格添加鼠标事件监听器
table.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e) { // 发生了单击事件
int selectedRow = table.getSelectedRow(); // 获得被选中行的索引
// 从表格模型中获得指定单元格的值
Object oa = tableModel.getValueAt(selectedRow, 0);
// 从表格模型中获得指定单元格的值
Object ob = tableModel.getValueAt(selectedRow, 1);
aTextField.setText(oa.toString()); // 将值赋值给文本框
bTextField.setText(ob.toString()); // 将值赋值给文本框
}
});
scrollPane.setViewportView(table);
JPanel panel = new JPanel();
getContentPane().add(panel, BorderLayout.SOUTH);
panel.add(new JLabel("A："));
aTextField = new JTextField("A4", 10);
panel.add(aTextField);
panel.add(new JLabel("B："));
bTextField = new JTextField("B4", 10);
panel.add(bTextField);
JButton addButton = new JButton("添加");
addButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
String[] rowValues = {aTextField.getText(),
bTextField.getText()}; // 创建表格行数组
tableModel.addRow(rowValues); // 向表格模型中添加一行
int rowCount = table.getRowCount() + 1;
aTextField.setText("A" + rowCount);
bTextField.setText("B" + rowCount);
}
});
panel.add(addButton);
JButton updButton = new JButton("修改");
updButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
int selectedRow = table.getSelectedRow(); // 获得被选中行的索引
if (selectedRow != -1) { // 判断是否存在被选中行
// 修改表格模型当中的指定值
tableModel.setValueAt(aTextField.getText(), selectedRow, 0);
// 修改表格模型当中的指定值
tableModel.setValueAt(bTextField.getText(), selectedRow, 1);
}
}
});
panel.add(updButton);
JButton delButton = new JButton("删除");
delButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
int selectedRow = table.getSelectedRow(); // 获得被选中行的索引
if (selectedRow != -1) // 判断是否存在被选中行
tableModel.removeRow(selectedRow); // 从表格模型当中删除指定行
}
});
panel.add(delButton);
}
}
//例题18.24

18.10：时间监听器

18.10.1：ActionEvent动作事件

package eightth;

import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.WindowConstants;

public class SimpleEvent extends JFrame {

   private JButton jb = new JButton("我是按钮，点击我");

   public SimpleEvent() {
       setLayout(null);
       setSize(200, 100);
       setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
       Container cp = getContentPane();
       cp.add(jb);
       jb.setBounds(10, 10, 150, 30);
       jb.addActionListener(new jbAction());
       setVisible(true);
   }

   class jbAction implements ActionListener {
       public void actionPerformed(ActionEvent arg0) {
           jb.setText("我被点击了");
       }
   }

   public static void main(String[] args) {
       new SimpleEvent();
   }
}

//例题18.25
18.10.2：KeyEvent键盘事件
package eightth;

import java.awt.BorderLayout;
import java.awt.EventQueue;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import java.awt.Color;
import java.awt.Component;

import javax.swing.JButton;
import java.awt.Font;
import javax.swing.SwingConstants;
import javax.swing.border.TitledBorder;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.util.ArrayList;

import javax.swing.JTextField;

// 虚拟键盘(键盘的按下与释放)

public class KeyBoard extends JFrame { // 创建“键盘”类继承JFrame
   // 声明窗体中的成员组件
   private JPanel contentPane;
   private JTextField textField;
   private JButton btnQ;
   private JButton btnW;
   private JButton btnE;
   private JButton btnR;
   private JButton btnT;
   private JButton btnY;
   private JButton btnU;
   private JButton btnI;
   private JButton btnO;
   private JButton btnP;
   private JButton btnA;
   private JButton btnS;
   private JButton btnD;
   private JButton btnF;
   private JButton btnG;
   private JButton btnH;
   private JButton btnJ;
   private JButton btnK;
   private JButton btnL;
   private JButton btnZ;
   private JButton btnX;
   private JButton btnC;
   private JButton btnV;
   private JButton btnB;
   private JButton btnN;
   private JButton btnM;
   Color green = Color.GREEN;// 定义Color对象，用来表示按下键的颜色
   Color white = Color.WHITE;// 定义Color对象，用来表示释放键的颜色

   ArrayList<JButton> btns = new ArrayList<JButton>();// 定义一个集合，用来存储所有的按键ID
   // 自定义一个方法，用来将容器中的所有JButton组件添加到集合中

   private void addButtons() {
       for (Component cmp : contentPane.getComponents()) {// 遍历面板中的所有组件
           if (cmp instanceof JButton) {// 判断组件的类型是否为JButton类型
               btns.add((JButton) cmp);// 将JButton组件添加到集合中
           }
       }
   }

   //主方法

   public static void main(String[] args) {
       EventQueue.invokeLater(new Runnable() { // 使得Runnable中的的run()方法在the system EventQueue的指派线程中被调用
           public void run() {
               try {
                   KeyBoard frame = new KeyBoard(); // 创建KeyBoard对象
                   frame.setVisible(true); // 使frame可视
                   frame.addButtons();// 初始化存储所有按键的集合
               } catch (Exception e) {
                   e.printStackTrace();
               }
           }
       });
   }

   // 创建JFrame窗体

   public KeyBoard() { // KeyBoard的构造方法
       setTitle("\u865A\u62DF\u952E\u76D8\uFF08\u6A21\u62DF\u952E\u76D8\u7684\u6309\u4E0B\u4E0E\u91CA\u653E\uFF09"); // 设置窗体题目
       setResizable(false); // 不可改变窗体宽高
       setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // 设置窗体关闭的方式
       setBounds(100, 100, 560, 280); // 设置窗体的位置和宽高
       //创建JPanel面板contentPane置于JFrame窗体中，并设置面板的背景色、边距和布局

       contentPane = new JPanel();
       contentPane.setBackground(Color.WHITE);
       contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
       setContentPane(contentPane);
       contentPane.setLayout(null);
       //创建按钮button置于面板contentPane中，设置按钮的背景色、位置、宽高以及按钮中的字体位置、内容、样式
       btnQ = new JButton("Q");
       btnQ.setBackground(white);
       btnQ.setVerticalAlignment(SwingConstants.TOP);
       btnQ.setHorizontalAlignment(SwingConstants.LEADING);
       btnQ.setFont(new Font("Times New Roman", Font.PLAIN, 14));
       btnQ.setBounds(0, 60, 47, 45);
       contentPane.add(btnQ);
       // 创建按钮button_2置于面板contentPane中，设置按钮的背景色、位置、宽高以及按钮中的字体位置、内容、样式

       btnW = new JButton("W");
       btnW.setBackground(white);
       btnW.setVerticalAlignment(SwingConstants.TOP);
       btnW.setHorizontalAlignment(SwingConstants.LEADING);
       btnW.setFont(new Font("Times New Roman", Font.PLAIN, 14));
       btnW.setBounds(55, 60, 49, 45);
       contentPane.add(btnW);
       // 创建按钮button_3置于面板contentPane中，设置按钮的背景色、位置、宽高以及按钮中的字体位置、内容、样式

       btnE = new JButton("E");
       btnE.setBackground(white);
       btnE.setVerticalAlignment(SwingConstants.TOP);
       btnE.setHorizontalAlignment(SwingConstants.LEADING);
       btnE.setFont(new Font("Times New Roman", Font.PLAIN, 14));
       btnE.setBounds(110, 60, 45, 45);
       contentPane.add(btnE);
       // 创建按钮button_4置于面板contentPane中，设置按钮的背景色、位置、宽高以及按钮中的字体位置、内容、样式

       btnR = new JButton("R");
       btnR.setBackground(white);
       btnR.setVerticalAlignment(SwingConstants.TOP);
       btnR.setHorizontalAlignment(SwingConstants.LEADING);
       btnR.setFont(new Font("Times New Roman", Font.PLAIN, 14));
       btnR.setBounds(165, 60, 45, 45);
       contentPane.add(btnR);
       // 创建按钮button_5置于面板contentPane中，设置按钮的背景色、位置、宽高以及按钮中的字体位置、内容、样式

       btnF = new JButton("F");
       btnF.setBackground(white);
       btnF.setVerticalAlignment(SwingConstants.TOP);
       btnF.setHorizontalAlignment(SwingConstants.LEADING);
       btnF.setFont(new Font("Times New Roman", Font.PLAIN, 14));
       btnF.setBounds(195, 125, 45, 45);
       contentPane.add(btnF);
       //创建按钮button_6置于面板contentPane中，设置按钮的背景色、位置、宽高以及按钮中的字体位置、内容、样式

       btnD = new JButton("D");
       btnD.setBackground(white);
       btnD.setVerticalAlignment(SwingConstants.TOP);
       btnD.setHorizontalAlignment(SwingConstants.LEADING);
       btnD.setFont(new Font("Times New Roman", Font.PLAIN, 14));
       btnD.setBounds(137, 125, 45, 45);
       contentPane.add(btnD);

       btnT = new JButton("T");
       btnT.setVerticalAlignment(SwingConstants.TOP);
       btnT.setHorizontalAlignment(SwingConstants.LEADING);
       btnT.setFont(new Font("Times New Roman", Font.PLAIN, 14));
       btnT.setBackground(white);
       btnT.setBounds(220, 60, 45, 45);
       contentPane.add(btnT);

       btnY = new JButton("Y");
       btnY.setVerticalAlignment(SwingConstants.TOP);
       btnY.setHorizontalAlignment(SwingConstants.LEADING);
       btnY.setFont(new Font("Times New Roman", Font.PLAIN, 14));
       btnY.setBackground(white);
       btnY.setBounds(275, 60, 45, 45);
       contentPane.add(btnY);

       btnU = new JButton("U");
       btnU.setVerticalAlignment(SwingConstants.TOP);
       btnU.setHorizontalAlignment(SwingConstants.LEADING);
       btnU.setFont(new Font("Times New Roman", Font.PLAIN, 14));
       btnU.setBackground(white);
       btnU.setBounds(330, 60, 45, 45);
       contentPane.add(btnU);

       btnI = new JButton("I");
       btnI.setVerticalAlignment(SwingConstants.TOP);
       btnI.setHorizontalAlignment(SwingConstants.LEADING);
       btnI.setFont(new Font("Times New Roman", Font.PLAIN, 14));
       btnI.setBackground(white);
       btnI.setBounds(385, 60, 45, 45);
       contentPane.add(btnI);

       btnO = new JButton("O");
       btnO.setVerticalAlignment(SwingConstants.TOP);
       btnO.setHorizontalAlignment(SwingConstants.LEADING);
       btnO.setFont(new Font("Times New Roman", Font.PLAIN, 14));
       btnO.setBackground(white);
       btnO.setBounds(440, 60, 46, 45);
       contentPane.add(btnO);

       btnP = new JButton("P");
       btnP.setVerticalAlignment(SwingConstants.TOP);
       btnP.setHorizontalAlignment(SwingConstants.LEADING);
       btnP.setFont(new Font("Times New Roman", Font.PLAIN, 14));
       btnP.setBackground(white);
       btnP.setBounds(495, 60, 45, 45);
       contentPane.add(btnP);

       btnA = new JButton("A");
       btnA.setVerticalAlignment(SwingConstants.TOP);
       btnA.setHorizontalAlignment(SwingConstants.LEADING);
       btnA.setFont(new Font("Times New Roman", Font.PLAIN, 14));
       btnA.setBackground(white);
       btnA.setBounds(23, 125, 45, 45);
       contentPane.add(btnA);

       btnS = new JButton("S");
       btnS.setVerticalAlignment(SwingConstants.TOP);
       btnS.setHorizontalAlignment(SwingConstants.LEADING);
       btnS.setFont(new Font("Times New Roman", Font.PLAIN, 14));
       btnS.setBackground(white);
       btnS.setBounds(82, 125, 45, 45);
       contentPane.add(btnS);

       btnG = new JButton("G");
       btnG.setVerticalAlignment(SwingConstants.TOP);
       btnG.setHorizontalAlignment(SwingConstants.LEADING);
       btnG.setFont(new Font("Times New Roman", Font.PLAIN, 14));
       btnG.setBackground(white);
       btnG.setBounds(251, 125, 45, 45);
       contentPane.add(btnG);

       btnH = new JButton("H");
       btnH.setVerticalAlignment(SwingConstants.TOP);
       btnH.setHorizontalAlignment(SwingConstants.LEADING);
       btnH.setFont(new Font("Times New Roman", Font.PLAIN, 14));
       btnH.setBackground(white);
       btnH.setBounds(306, 125, 45, 45);
       contentPane.add(btnH);

       btnJ = new JButton("J");
       btnJ.setVerticalAlignment(SwingConstants.TOP);
       btnJ.setHorizontalAlignment(SwingConstants.LEADING);
       btnJ.setFont(new Font("Times New Roman", Font.PLAIN, 14));
       btnJ.setBackground(white);
       btnJ.setBounds(361, 125, 45, 45);
       contentPane.add(btnJ);

       btnK = new JButton("K");
       btnK.setVerticalAlignment(SwingConstants.TOP);
       btnK.setHorizontalAlignment(SwingConstants.LEADING);
       btnK.setFont(new Font("Times New Roman", Font.PLAIN, 14));
       btnK.setBackground(white);
       btnK.setBounds(416, 125, 47, 45);
       contentPane.add(btnK);

       btnL = new JButton("L");
       btnL.setVerticalAlignment(SwingConstants.TOP);
       btnL.setHorizontalAlignment(SwingConstants.LEADING);
       btnL.setFont(new Font("Times New Roman", Font.PLAIN, 14));
       btnL.setBackground(white);
       btnL.setBounds(471, 125, 45, 45);
       contentPane.add(btnL);

       btnZ = new JButton("Z");
       btnZ.setVerticalAlignment(SwingConstants.TOP);
       btnZ.setHorizontalAlignment(SwingConstants.LEADING);
       btnZ.setFont(new Font("Times New Roman", Font.PLAIN, 14));
       btnZ.setBackground(white);
       btnZ.setBounds(39, 190, 45, 45);
       contentPane.add(btnZ);

       btnX = new JButton("X");
       btnX.setVerticalAlignment(SwingConstants.TOP);
       btnX.setHorizontalAlignment(SwingConstants.LEADING);
       btnX.setFont(new Font("Times New Roman", Font.PLAIN, 14));
       btnX.setBackground(white);
       btnX.setBounds(107, 190, 45, 45);
       contentPane.add(btnX);

       btnC = new JButton("C");
       btnC.setVerticalAlignment(SwingConstants.TOP);
       btnC.setHorizontalAlignment(SwingConstants.LEADING);
       btnC.setFont(new Font("Times New Roman", Font.PLAIN, 14));
       btnC.setBackground(white);
       btnC.setBounds(178, 190, 45, 45);
       contentPane.add(btnC);

       btnV = new JButton("V");
       btnV.setVerticalAlignment(SwingConstants.TOP);
       btnV.setHorizontalAlignment(SwingConstants.LEADING);
       btnV.setFont(new Font("Times New Roman", Font.PLAIN, 14));
       btnV.setBackground(white);
       btnV.setBounds(250, 190, 45, 45);
       contentPane.add(btnV);

       btnB = new JButton("B");
       btnB.setVerticalAlignment(SwingConstants.TOP);
       btnB.setHorizontalAlignment(SwingConstants.LEADING);
       btnB.setFont(new Font("Times New Roman", Font.PLAIN, 14));
       btnB.setBackground(white);
       btnB.setBounds(315, 190, 45, 45);
       contentPane.add(btnB);

       btnN = new JButton("N");
       btnN.setVerticalAlignment(SwingConstants.TOP);
       btnN.setHorizontalAlignment(SwingConstants.LEADING);
       btnN.setFont(new Font("Times New Roman", Font.PLAIN, 14));
       btnN.setBackground(white);
       btnN.setBounds(382, 190, 47, 45);
       contentPane.add(btnN);

       btnM = new JButton("M");
       btnM.setVerticalAlignment(SwingConstants.TOP);
       btnM.setHorizontalAlignment(SwingConstants.LEADING);
       btnM.setFont(new Font("Times New Roman", Font.PLAIN, 14));
       btnM.setBackground(white);
       btnM.setBounds(449, 190, 48, 45);
       contentPane.add(btnM);
       // 创建面板panel置于面板contentPane中，设置面板panel的位置、宽高、TitledBorder、背景色以及布局方式（边界布局）

       JPanel panel = new JPanel();
       panel.setBorder(new TitledBorder(null, "文本显示区", TitledBorder.LEADING, TitledBorder.TOP, null, null));
       panel.setBackground(Color.WHITE);
       panel.setBounds(0, 0, 540, 45);
       contentPane.add(panel);
       panel.setLayout(new BorderLayout(0, 0));

       // 创建文本框textField置于面板panel的中间

       textField = new JTextField();
       textField.addKeyListener(new KeyAdapter() { // 文本框添加键盘事件的监听
           char word;

           @Override
           public void keyPressed(KeyEvent e) { // 按键被按下时被触发
               word = e.getKeyChar();// 获取按下键表示的字符
               for (int i = 0; i < btns.size(); i++) {// 遍历存储按键ID的ArrayList集合
                   // 判断按键是否与遍历到的按键的文本相同
                   if (String.valueOf(word).equalsIgnoreCase(btns.get(i).getText())) {
                       btns.get(i).setBackground(green);// 将指定按键颜色设置为绿色
                   }
               }
           }

           @Override
           public void keyReleased(KeyEvent e) { // 按键被释放时被触发
               word = e.getKeyChar();// 获取释放键表示的字符
               for (int i = 0; i < btns.size(); i++) {// 遍历存储按键ID的ArrayList集合
                   // 判断按键是否与遍历到的按键的文本相同
                   if (String.valueOf(word).equalsIgnoreCase(btns.get(i).getText())) {
                       btns.get(i).setBackground(white);// 将指定按键颜色设置为白色
                   }
               }
           }
       });
       panel.add(textField, BorderLayout.CENTER);
       textField.setColumns(10);
   }
}
//例题18.26

18.10.3：MouseEvent鼠标事件

package eightth;

import java.awt.BorderLayout;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;

import javax.swing.JFrame;
import javax.swing.JLabel;

public class MouseEventDemo extends JFrame { // 继承窗体类JFrame

   public static void main(String args[]) {
       MouseEventDemo frame = new MouseEventDemo();
       frame.setVisible(true); // 设置窗体可见，默认为不可见
   }

   // 判断按下的鼠标键，并输出相应提示 @param e 鼠标事件

   private void mouseOper(MouseEvent e) {
       int i = e.getButton(); // 通过该值可以判断按下的是哪个键
       if (i == MouseEvent.BUTTON1)
           System.out.println("按下的是鼠标左键");
       else if (i == MouseEvent.BUTTON2)
           System.out.println("按下的是鼠标滚轮");
       else if (i == MouseEvent.BUTTON3)
           System.out.println("按下的是鼠标右键");
   }

   public MouseEventDemo() {
       super(); // 继承父类的构造方法
       setTitle("鼠标事件示例"); // 设置窗体的标题
       setBounds(100, 100, 500, 375); // 设置窗体的显示位置及大小
       // 设置窗体关闭按钮的动作为退出
       setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

       final JLabel label = new JLabel();
       label.addMouseListener(new MouseListener() {
           public void mouseEntered(MouseEvent e) {// 光标移入组件时被触发
               System.out.println("光标移入组件");
           }

           public void mousePressed(MouseEvent e) {// 鼠标按键被按下时被触发
               System.out.print("鼠标按键被按下，");
               mouseOper(e);
           }

           public void mouseReleased(MouseEvent e) {// 鼠标按键被释放时被触发
               System.out.print("鼠标按键被释放，");
               mouseOper(e);
           }

           public void mouseClicked(MouseEvent e) {// 发生单击事件时被触发
               System.out.print("单击了鼠标按键，");
               mouseOper(e);
               int clickCount = e.getClickCount();// 获取鼠标单击次数
               System.out.println("单击次数为" + clickCount + "下");
           }

           public void mouseExited(MouseEvent e) {// 光标移出组件时被触发
               System.out.println("光标移出组件");
           }
       });
       getContentPane().add(label, BorderLayout.CENTER);
       //
   }

}

//例题18.27