使用泛型迭代Map集合

package com.bird.beanutils;

import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Set;
import java.util.Map.Entry;

import org.junit.Test;

/**
 * @use 使用泛型对Map进行迭代
 * @author Bird
 *
 */
public class DemoMap {
	
	@Test
	public void test1(){//对Map进行迭代
		Map<Integer,String> map = new LinkedHashMap<Integer,String>();
		map.put(1, "one");
		map.put(2, "two");
		map.put(3, "three");
		map.put(4, "four");
		map.put(5, "five");
		map.put(7, "seven");
		
		//传统EntrySet迭代
		Set<Map.Entry<Integer, String>> set = map.entrySet();
		Iterator<Entry<Integer, String>>  it = set.iterator();
		while(it.hasNext()){
			Map.Entry<Integer, String> entry = it.next();
			int key = entry.getKey();
			String value = entry.getValue();
			
			System.out.println("key" + " "+ key + "\n"+"value" + " "+ value);
		}
	}
	
	
	@Test
	public void test2(){//使用增强for循环
		Map<Integer,String> map = new LinkedHashMap<Integer,String>();
		map.put(1, "one");
		map.put(2, "two");
		map.put(3, "three");
		map.put(4, "four");
		map.put(5, "five");
		map.put(7, "seven");
		
		for(Map.Entry<Integer, String> en : map.entrySet()){
			int num = en.getKey();
			String value = en.getValue();
			
			System.out.println(num + "==" + value);
		}
		
	}
}
posted on 2011-11-15 20:44 sp2012 阅读(1190) 评论(0) 收藏举报