1.抽象工厂设计模式

定义了一个接口用于创建相关或有依赖关系的对象族，而无需明确指定具体类public interface AbsFactory{Pizza createPizza(String ordertype)
}public class LDFactory implement AbsFactory{@Overrriedpublic createPizza(String orderType){Pizza pizza = null;if("cheese".equals(orderType)){pizza = new LDCheesFactory();}else if("pepper".equals(orderType)){pizza = new LDPepperPizza();}return pizza;}
}public class PizzaStroe{public static void main(string[] args){OrderPizza mOrderPizza;mOrderPizza = new OrderPizza("cheese")}
}

2.单例模式

确保一个类只有一个实例1.预加载    
public class ProloadSingLeton{public static ProloadSingLeton instance = new ProloadSingLeton();private ProloadSingLeton(){};public static ProloadSingLeton getInstance(){return instance;}
}2.懒加载
public class Singleton{private static Singleton instance = null;private Singleton(){};public static synchronized Singleton getInstance(){if(instance == null){synchronized (instance){if(instance == null){instance = new Singleton();}}}return instance;}
}

3.生成器模式

封装一个复杂对象的构造过程，允许按步骤构造
模式结构： 产品+抽象生成器+具体生产器+指挥者public abstract class ComputerBuilder{protected Computer computer;public Computer getComputer(){return computer;}public void buildComputer(){Computer computer = new Computer();System.out.println("生成一台电脑")}public abstract void buildMaster();public abstract void buildScrenn();public abstract void buildKeyboard();public abstract void buildMouse();public abstract void buildAudio();
}public class HPComputerBuilder extends ComputerBuilder{   @Overridepublic void buildMaster() {// TODO Auto-generated method stubcomputer.setMaster("i7,16g,512SSD,1060");System.out.println("(i7,16g,512SSD,1060)的惠普主机");}@Overridepublic void buildScreen() {// TODO Auto-generated method stubcomputer.setScreen("1080p");System.out.println("(1080p)的惠普显示屏");}@Overridepublic void buildKeyboard() {// TODO Auto-generated method stubcomputer.setKeyboard("cherry 青轴机械键盘");System.out.println("(cherry 青轴机械键盘)的键盘");}@Overridepublic void buildMouse() {// TODO Auto-generated method stubcomputer.setMouse("MI 鼠标");System.out.println("(MI 鼠标)的鼠标");}@Overridepublic void buildAudio() {// TODO Auto-generated method stubcomputer.setAudio("飞利浦 音响");System.out.println("(飞利浦 音响)的音响");}
}public class Director{private ComputerBuilder computerBuilder;public void setComputerBuilder(ComputerBuilder computerBuilder){this.computerBuilder = computerBuilder;}public void constructComputer(){computerBuilder.buildCompputer();computerBuilder.buildMaster();computerBuilder.buildScreen();computerBuilder.buildKeyboard();computerBuilder.buildMouse();computerBuilder.buildAudio();}
}

4. 原型模式

通过复制现有实例来创建新的实例，无需知道相应类的信息(深拷贝)public class Prototyoe implements Cloneable{public Object clone() throw Exception{Prototype proto = (Prototype) super.clean();return proto;}
}