import java.util.*;
class Tester {
public static void main(String[] args) {
ArrayList < Student > list = new ArrayList < Student > ();
for (int i = 0; i < 5; i++) {
int age = (int)(Math.random() * 24) + 7;
Student s = new Student("学生" + i, age);
list.add(s);
}
System.out.println("排序前:" + list);
Collections.sort(list);
System.out.println("排序后:" + list);
}
}
class Student implements Comparable<Student> {
private String name;
private int age;
public Student(String name, int age) {
this.name = name;
this.age = age;
}
public int compareTo(Student obj) {
if(this.age>obj.age){
return 1;
}else if(this.age<obj.age){
return -1;
}else{
return 0;
}
}
public String toString() {
String showStr = "姓名: "+this.name + ";年龄: " + this.age;
return showStr;
}
}
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