1.定义一个TestList类要求如下
(1)利用List接口和泛型新建一个ArrayList对象list,要求为String类型;
(2)list添加“China”,“Usa”,“India”,“Japan”四个字符串;
(3)打印输出list
(4)用3种方式遍历list元素
(5)删除索引为2的元素,然后打印输出list;
package cn.edu.ahtcm.bean;
import java.util.*;
public class Testlist {
public static void main(String[] args){
ArrayList<String> list = new ArrayList<>();
list.add("China");
list.add("Usa");
list.add("India");
list.add("Japan");
Collections.sort(list);
System.out.println(list);
for (String i :list){
System.out.println(i);
}
for (int i = 0; i < list.size();i++){
System.out.println(list.get(i));
}
String a;
for (String value : list){
a = value;
System.out.println(a);
}
list.remove(2);
System.out.println(list);
}
}