equals方法的实现

Cat类（三个成员变量furcolor,height,weight)的equals方法如下public boolean equals(Object obj)实现过程：先判参数不为空，接着判是否同一类型，否的话，强转后比较三个成员变量均都相同才返回真，否则为假

import java.util.Objects;

public class Cat {
    String furcolor;
    float height;
    float weight;
    public Cat(){}
    public Cat(String furcolor,float height,float weight){
        this.furcolor = furcolor;
        this.height = height;
        this.weight = weight;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        Cat cat = (Cat) o;
        return Float.compare(cat.height, height) == 0 &&
                Float.compare(cat.weight, weight) == 0 &&
                Objects.equals(furcolor, cat.furcolor);
    }

    @Override
    public int hashCode() {
        return Objects.hash(furcolor, height, weight);
    }

    public String getFurcolor() {
        return furcolor;
    }

    public void setFurcolor(String furcolor) {
        this.furcolor = furcolor;
    }

    public float getHeight() {
        return height;
    }

    public void setHeight(float height) {
        this.height = height;
    }

    public float getWeight() {
        return weight;
    }

    public void setWeight(float weight) {
        this.weight = weight;
    }
}

getClass().toString()获取变量类型进行比较，三个变量比较

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