实现接口的java类不能在equals中使用自身而不是对象

qni6mghb 于 2021-07-11 发布在 Java

关注(0)|答案(2)|浏览(321)

我尝试继承一个接口，该接口包含接收另一个对象的方法equals，但在类中，我尝试使用类类型，例如：class grade，并用grade other重写该方法。如果我错了，请纠正我，任何类都继承自java中的对象类。我可能不太了解接口。谢谢！

public interface Comparable {

    int Bigger(String ... args);

    boolean Equals(Object other);

}

@Override
    public boolean Equals(Grade other) {
        if(other.getGrade() == this.getGrade() && other.getPoints() == this.getPoints() && other.getSubject() == this.getSubject())
            return true;
        return false;
    }

Java polymorphism Interface

来源：https://stackoverflow.com/questions/64891809/class-that-implements-an-interface-cant-use-itself-insted-of-object-in-equals

2条答案

按热度按时间

kknvjkwl1#

使用泛型：

interface Comparable<T> {
    // …
    boolean Equals(T other);
}

class Grade implements Comparable<Grade> {
    // …

    @Override
    public boolean Equals(Grade other) {
        return other.getGrade() == getGrade()
            && other.getPoints() == getPoints()
            && other.getSubject() == getSubject());
    }

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bbmckpt72#

忘记了泛型编程，

public interface Comparable<T>{

int Bigger(String ... args);

boolean Equals(T other);
}

public class Grade implements Comparable<Grade>{
@Override
public boolean Equals(Grade other) {
    if(other.getGrade() == this.getGrade() && other.getPoints() == this.getPoints() && other.getSubject() == this.getSubject())
        return true;
    return false;
}
}

赞(0）回复(0）举报 2021-07-11

我来回答

实现接口的java类不能在equals中使用自身而不是对象

2条答案

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