hashmaptest.java

本压缩文件中含有线程的控制

package connections;

import java.util.*;
class HashMapTest{
	public static void printElements(Collection<String> c){
		Iterator<String> it=c.iterator();
		while(it.hasNext()){
			System.out.println(it.next());
		}
	}
	public static void main(String[] args){
		HashMap<String,String> hm=new HashMap<String,String>();
		hm.put("one","zhangsan");
		hm.put("two","lisi");
		hm.put("three","wangwu");
		
		System.out.println(hm.get("one"));
		System.out.println(hm.get("two"));
		System.out.println(hm.get("three"));
		
		
		Set<String> keys=hm.keySet();
		Iterator<String> it1 = keys.iterator();
		while(it1.hasNext()){
			String key = it1.next();
			System.out.println(key + ">>" + hm.get(key));
		}
//		System.out.println("Key:");
//		printElements(keys);
		
		Collection<String> values=hm.values();
		System.out.println("Value:");
		printElements(values);
		
		Set<Map.Entry<String, String>> entry=hm.entrySet();
		//printElements(entry);
		Iterator<Map.Entry<String, String>> it=entry.iterator();
		
		while(it.hasNext()){
			Map.Entry<String,String> me=(Map.Entry<String,String>)it.next();
			System.out.println(me.getKey()+":"+me.getValue());
		}
		
	}
}