CoreJava_Collection接口中的add是有返回值的！

    下面是一个小例子，细节决定成败，与君共勉。

import java.util.Collection;
import java.util.HashSet;

public class CollectionInterface {
    public static void main(String[] args) {
        int[] arrays = new int[]{1,2,3,4,5,6,7,8,9,10,1,2,3,4,5};
        Collection<Integer> set = new HashSet<Integer>();
        int counter = 0;
        for(int temp :arrays){
            if(set.add(temp)){
                counter++;
            }else{
                System.out.println("The date "+temp+" has already been existent,discard it.");
            }
        }
        System.out.println("counter=> "+counter);
        System.out.println("set.size()=> "+set.size());
    }
}

CoreJava_Collection接口中的add是有返回值的！,布布扣,bubuko.com

CoreJava_Collection接口中的add是有返回值的！

原文：http://blog.csdn.net/ziwen00/article/details/38660125