Java的比较接口comparable与comparator

Posted 2021-05-07 z2529827226

package test0;

import java.util.Comparator;


//限定修饰符为friend不能为public，一个java文件中只能有一个public类
/***
 * java程序是从一个public类的main函数开始执行的，
 *（其实是main线程），就像c程序是从main（）函数开始执行一样。   
 * 只能有一个public类是为了给类装载器提供方便。
 */

interface MyComparable<T>{     //接口类--抽象类
    
    public int compare(T agr0); //抽象方法--在子类中实现
    
}

class student implements Comparable<student> {
    private String name="zhang";
    private int num=12;

    @Override
    public String toString() {
        return "名字为:" + name +","+ "学号为:" + num;
    }

    @Override
    public int compareTo(student arg0) {
        
        return this.num-arg0.num;
    }
   
}


class teacher implements Comparator<student> {
    private String name="zhang";
    private int num=12;

    @Override
    public String toString() {
        return "名字为:" + name +","+ "学号为:" + num;
    }

    @Override
    public int compare(student arg0, student arg1) {
        // TODO Auto-generated method stub
        return 0;
    }
   
}




public class Test {
    
    public static void main(String[] args) {
        teacher space=new teacher();
        
    }

}