Comparator挽救比較器

挽救比較器
類已經定義了不能修改類
class Persion{
    private String name;
    private int age;
    
    public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public Persion(String name,int age) {
    this.name = name;
    this.age = age;
    }
    @Override
    public String toString() {
    return "姓名：" + this.name + ",年齡：" + this.age;
    }
}
class PersionComparator implements Comparator<Persion>{


@Override
public int compare(Persion arg0, Persion arg1) {
// TODO Auto-generated method stub
return arg0.getAge()-arg1.getAge();
}

}
public class CompareTor {
 public static void main(String args[]) {
Persion per[] =new Persion [] {
new Persion("小李",39),  
new Persion("小茗",19),
new Persion("小紅",33)
};
Arrays.sort(per,new PersionComparator());
System.out.println(Arrays.toString(per));
 }
}
在進行對象數組排序的過程中需要使用比較器，比較器有兩個
java.lang.Comparable是在類定義的時候默認實現好的接口，裏面提供了一個compareTo()
java.util.Comparator需要單獨定義一個排序的配角規則類裏面有兩個方法compare和equals()