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());
}
}
}
