java遍历map

import java.util.HashMap;
import java.util.Map;


public class Test {

	public static void main(String[] args) {
		
		Map<String,String> m = new HashMap<String,String>();
		m.put("a", "perfect");
		m.put("b", "good");
		m.put("c", "fantastic");
		m.put("d", "wonderful");
		
		for(Object o : m.keySet()){
		   System.out.println("key:"+o+"------value:"+ m.get(o).toString());
		}
	}
	
	
}