在Java中实现equals方法 [英] Implementing the equals method in java

问题描述

这是我对Coor类的equals类的实现，该类仅包含2个整数x和y.这是实现此方法的正确方法吗?

This is my implementation of the equals class for a Coor class which is just contains 2 ints x and y. would this be the proper way of implementing this method?

 public boolean equals(Object obj) {
        if (obj == null || obj.getClass() != this.getClass()) {
            return false;
        }
        Coor temp = (Coor) obj;
        if (temp.x == this.x && temp.y == this.y) {
            return true;
        } else {
            return false;
        }
    }

推荐答案

您可以再添加一项自反性检查(等于自我检查):

You could add one more check for reflexive equality (equal to self):

 public boolean equals(Object obj) {

    // Reflexive equality: did I get passed myself?
    if(this == obj){
        return true;
    }

    if (obj == null || obj.getClass() != this.getClass()) {
        return false;
    }

    Coor temp = (Coor) obj;
    return temp.x == this.x && temp.y == this.y;
}

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