Colleation小练习

package com.wangg;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;

public class Dome01 {
    public static void main(String[] args) {
        Collection collection = new ArrayList();
        collection.add(18);
        collection.add(15);
        collection.add(666);
        collection.add("王刚");
        System.out.println(collection);
        List list= Arrays.asList(new Integer[]{15, 16, 17, 18, 19});
        collection.addAll(list);
        System.out.println(collection);
        //collection.clear();//删除集合所有元素
        System.out.println(collection);
        System.out.println("集合的数量为："+collection.size());
        System.out.println("集合是否为空："+collection.isEmpty());
        boolean isr = collection.remove(19);//删除集合指定数据
        System.out.println(collection);
        System.out.println("集合数据是否删除："+isr);
        Collection collection1 = new ArrayList();
        collection1.add(18);
        collection1.add(15);
        collection1.add(666);
        collection1.add("王刚");
        Collection collection2 = new ArrayList();
        collection2.add(18);
        collection2.add(15);
        collection2.add(666);
        collection2.add("王刚");
        System.out.println(collection1.equals(collection2));//equals是比较是否一样
        System.out.println(collection1==collection2);//比较大小比较的是地址，所以不一样
        System.out.println(collection1.contains(666));//contains是否包含


    }
}

Colleation小练习

原文：https://www.cnblogs.com/java5745/p/15113375.html