參考：原文地址

1.java collection ?overview

?

2.Map ?接口 概覽

3、常用接口方法使用示例

add ?remove ?addAll ?removeAll

package com.interview.base.collection;

import java.util.ArrayList;

import java.util.Collection;

import java.util.HashSet;

import java.util.Iterator;

import java.util.List;

import java.util.Set;

public class MyCollectionUtil {

public static void doSomething(Collection collection) {

Iterator iterator = collection.iterator();

while(iterator.hasNext()){

Object object = iterator.next();

//do something to object here...

}

}

public static void main(String[] args) {

String? ? anElement? = "an element";

String? ? twoElement? = "an element";

Collection setCollection = new HashSet();

Collection listCollection = new ArrayList();

boolean setChange = setCollection.add(anElement);

boolean setChange2 = setCollection.add(anElement);

System.out.println(setChange2);

System.out.println("setCollection: "+ setCollection.size());

System.out.println("contain test: " + setCollection.contains("aobo"));

boolean? removeExist = setCollection.remove(anElement);

boolean? removeNotExist = setCollection.remove("aobo");

System.out.println("removeExist: " + removeExist);

System.out.println("removeNotExist: " + removeNotExist);

boolean listChange = listCollection.add(anElement);

boolean listChange2 = listCollection.add(anElement);

System.out.println("listCollection: "+ listCollection.size());

// the first output method

for(Object s : listCollection){

System.out.println(s.toString());

}

//the secondn output? method

Iterator iterator = listCollection.iterator();

System.out.println("----------------------華麗分割線---------------------------------");

while(iterator.hasNext()){

Object object = iterator.next();

//do something to object;

System.out.println(object.toString());

}

}

}