java - 如何使用可比较的属性来比较两个对象 - JAVA

Question

我希望通过“int value”比较两个 Die 对象，并返回具有较高值的​​对象。我做错了什么......谢谢

public class Die implements DieIntf , Comparable {

    private int value;

    public Die(){}

class ComparatorId implements Comparator<Die> {

        @Override
        public int compare(Die t, Die t1) {
               Integer d1 = t.getValue();
               Integer d2 = t.getValue();
               if(d1>d2) return 1;
               else if(d1<d2) return -1;
               else return 0;
        }
    } 
}

Answer 1

Do not use Comparable/Comparator interface, until you have any requirement like sorting an object into ascending/descending order.

In your case, you want Bigger Object(based upon it's value) return while compare it.

所以做同样的事情

public class Die{

    int value;


    public Die compareMyDieObjce(Die d){

        if(this.value > d.value){
            return this;
        }

        return d;

    }

    @Override
    public String toString() {
        return " Object-Value : " + this.value;
    }

    public static void main(String[] args) {

        Die d1 = new Die(); d1.value = 5;
        Die d2 = new Die(); d2.value = 55;

        System.out.println(d1.compareMyDieObjce(d2)); // Object-Value : 55

    }

}