JAVA中Map的用法

Map 初始化

1	Map<String, String> map = new HashMap<String, String>();

插入元素

1	map.put("key1", "value1");

獲取元素

1	map.get("key1")

移除元素

1	map.remove("key1");

清空map

1	map.clear();

 

 

 

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Scanner;

import javax.activation.MailcapCommandMap;

public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc=new Scanner(System.in);
		
		
		Map<String, String> map=new HashMap<String, String>();
		
         //添加
		map.put("1", "111");
		map.put("2", "222");
		
		//for遍歷
		for(String key:map.keySet()) {
			System.out.println("key="+key+"   value"+map.get(key));
		}
		
        //迭代器遍歷
		Iterator<String>iterator=map.keySet().iterator();
		while(iterator.hasNext()) {
			String key=iterator.next();
			System.out.println(key+"   "+map.get(key));
		}
		sc.close();
	}

}