- 定义一个类TestCollectionsSort,要求如下
(1)查阅api文档(https://www.matools.com/api/java8 )和互联网资料,利用Collections的sort()方法对list[“China”,”Usa”,”India”,”Japan”]进行字典排序,然后输出排序前和排序后的结果
(2)定义一个ArrayList,添加[“China”,”Usa”,”india”,”Japan”]元素;
(3)利用Collections的sort()方法对list[“China”,”Usa”,”india”,”Japan”]进行字典排序,然后输出排序前和排序后的结果
package cn.edu.ahtcm.bean;
import java.util.*;
public class TestCollectionSort{
public List getListData(){
List list = new ArrayList();
list.add("China");
list.add("Usa");
list.add("India");
list.add("Japan");
return list;
}
public static void main(String[] args){
List list = new TestCollectionSort().getListData();
System.out.println("默认排序前:");
System.out.println(list);
Collections.sort(list);
System.out.println("默认排序后:");
System.out.println(list);
ArrayList<String> list1 = new ArrayList<>();
list1.add("China");
list1.add("Usa");
list1.add("india");
list1.add("Japan");
System.out.println("默认排序前:");
System.out.println(list1);
Collections.sort(list1);
System.out.println("默认排序后:");
System.out.println(list1);
}
}