ArrayList集合根据实体类字段进行升降排序

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本文链接： https://blog.csdn.net/ssssaaaawe/article/details/89665193

package nianling;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;

public class UserName {

public static void main(String[]ages) {
	User user = new User();
	user.setAge(11);
	user.setName("张三");
	
	User user1 = new User();
	user1.setAge(32);
	user1.setName("李四");
	
	User user2 = new User();
	user2.setAge(22);
	user2.setName("王二麻子");
	
	User user3 = new User();
	user3.setAge(19);
	user3.setName("小淘气");
	
	User user4 = new User();
	user4.setAge(16);
	user4.setName("王五");
	
	User user5 = new User();
	user5.setAge(24);
	user5.setName("赵六");
	ArrayList<User>list = new ArrayList<User>();
	list.add(user);
	list.add(user1);
	list.add(user2);
	list.add(user3);
	list.add(user4);
	list.add(user5);
	Collections.sort(list,new Comparator<User>() {

		@Override
		public int compare(User o1, User o2) {
			
			return o1.getAge()-o2.getAge();  //   升序
			return o2.getAge()-o1.getAge();  //   降序
		}
	});
	for (int i = 0; i < list.size(); i++) {
		System.out.println("年龄 = "+list.get(i).getAge()+"    姓名 = "+list.get(i).getName());
		
	}
}

}