Java学习Collections之案例:ArrayList存储学生对象并排序
    
package com.itheima_108;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
        
       
       
       
       
       
       
 
public class CollectionsDemo02 {
    public static void main(String[] args) {
        
        ArrayList<Student>  array = new ArrayList<Student>();
        
        Student s1 = new Student("林青霞",30);
        Student s2 = new Student("张曼玉",35);
        Student s3 = new Student("王祖贤",33);
        Student s4 = new Student("柳烟",33);
        
        array.add(s1);
        array.add(s2);
        array.add(s3);
        array.add(s4);
        
        
        Collections.sort(array, new Comparator<Student>() {
            @Override
            public int compare(Student s1, Student s2) {
                
                int num  = s1.getAge() - s2.getAge();
                int num2 = num==0?s1.getName().compareTo(s2.getName()):num;
                return num2;
            }
        });
        
        for(Student s:array){
            System.out.println(s.getName() + ":" + s.getAge());
        }
    }
}