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方法演示：

java">package exercise;import java.util.ArrayList;
import java.util.List;public class ListDemo1 {public static void main(String[] args) {List<String> list = new ArrayList<>();list.add("hello");list.add("world");list.add("java");System.out.println(list);list.add(1, "javaee");System.out.println(list);String remove = list.remove(2);System.out.println(remove + " " + list);String javaSe = list.set(1, "javaSe");System.out.println(javaSe + " " + list);for (int i = 0; i < list.size(); i++) {System.out.print(list.get(i) + " ");}}
}

tips:

java">package exercise;import java.util.ArrayList;
import java.util.List;public class ListDemo2 {public static void main(String[] args) {//List集合中的两个删除方法List<Integer> list = new ArrayList<>();list.add(1);list.add(2);list.add(3);//当方法出现重载时，优先调用形参和实参类型一致的那个方法。list.remove(1);System.out.println(list);//如不想这样，则需要手动装箱Integer i = Integer.valueOf(1);list.remove(i);System.out.println(list);}
}

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方法演示：

java">package exercise;import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;public class ListDemo3 {public static void main(String[] args) {List<String> list = new ArrayList<>();list.add("hello");list.add("world");list.add("java");Iterator<String> it = list.iterator();while (it.hasNext()) {String s = it.next();System.out.println(s);}System.out.println("=======");for (String s : list) {System.out.println(s);}System.out.println("=======");list.forEach(s -> System.out.println(s));System.out.println("=======");for (int i = 0; i < list.size(); i++) {System.out.println(list.get(i));}System.out.println("=======");//相比迭代器，额外添加了一个方法。在遍历过程中，可以添加元素ListIterator<String> s = list.listIterator();while (s.hasNext()) {String str = s.next();if ("world".equals(str)) {s.add("javaee");}}System.out.println(list);}
}

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