学步园

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

public class Du {

	public static void main(String[] args) {

		Map map = new HashMap();
		visitMapByKey(map);//通过key遍历
		visitMapByEntry(map);//通过entry遍历
	}

	private static void visitMapByEntry(Map map) {
		Iterator ite = map.entrySet().iterator();
		
		while(ite.hasNext()){
			Map.Entry<Object, Object> entry = (Entry<Object, Object>) ite.next();
			Object key = entry.getKey();//map中的key
			Object value = entry.getValue();//上面key对应的value
		}
	}

	private static void visitMapByKey(Map map) {
		Iterator keys = map.keySet().iterator();
		
		while(keys.hasNext()){
			Object key = keys.next();//key
			Object value = map.get(key);//上面key对应的value
		}
	}
}