Override注解报错怎么办 Method does not override method from its superclass

JackHe97 2021-03-25

源自：Java集合排序 4-4 编程练习

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好帮手慕阿满回答被采纳获得+3积分 2021-03-25 14:00:40

同学你好，compareTo()方法的参数是Employee类型，表示要对Employee类型比较排序，所以在实现Comparable接口时，需要指明泛型是Employee。

如果不指明泛型<Employee>，重写的compareTo()方法参数应该是Object类型。

祝学习愉快~

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JackHe97 提问者 2021-03-25 11:51:23

//实现Comparable接口
public class Employee implements Comparable {
    //成员变量
    private int no;
    private String name;
    private int salary;

    //构造方法

    public Employee() {
    }

    public Employee(int no, String name, int salary) {
        this.no = no;
        this.name = name;
        this.salary = salary;
    }

//getter和setter方法

    public int getNo() {
        return no;
    }

    public void setNo(int no) {
        this.no = no;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getSalary() {
        return salary;
    }

    public void setSalary(int salary) {
        this.salary = salary;
    }


    //toString()方法

    @Override
    public String toString() {
        return "no=" + no +
                ", name='" + name + '\'' +
                ", salary=" + salary +
                '}';
    }

    @Override
    public int compareTo(Employee o) {
        int a = this.getSalary();
        int b = o.getSalary();
        int n = a - b;
        return n;
    }