Posted on 2009-12-22 09:21
Gavin.lee 阅读(212)
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java SE & EE
package com.Gavin.tools.util;
import java.util.Hashtable;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
/** *//**
* @author Gavin.lee
* @date 2009-05-04 11:45am
* @param <K>
* @param <V>
*/
public class MapUtil<K, V> 
{
public void filter1(Map map) {
Iterator it = map.entrySet().iterator();
while (it.hasNext()) {
Map.Entry me = (Map.Entry) it.next();
System.out.println("key:" + me.getKey() + ",value:" + me.getValue());
}
System.out.println("************************************filter1");
}
public void filter2(Map map) {
Hashtable<String, String> ht = new Hashtable<String, String>();
ht.put("Gavin", "Kathy");
ht.put("杨过", "小龙女");
for (Map.Entry<String, String> me : ht.entrySet()) {
System.out.println("key:" + me.getKey() + ",value:" + me.getValue());
}
System.out.println("************************************filter2");
}
public void filter3(Map map) {
Iterator it = map.keySet().iterator();
while (it.hasNext()) {
String key;
key = (String) it.next();
System.out.println("key:" + key + ",value:" + map.get(key));
}
System.out.println("************************************filter3");
}
public void filter4(Map map) {
for (Object o : map.keySet()) {
System.out.println("key:" + o + ",value:" + map.get(o));
}
System.out.println("************************************filter4");
}
/** *//**
* 获得Map中特定value的key值
* @param map
* @param value
* @return
*/
public K getMapKeyFromValue(Map<K, V> map, V value) {
Set set = map.keySet();
K key = null;
Iterator it = set.iterator();
while (it.hasNext()) {
key = (K) it.next();
if (value.equals(map.get(key))) {
return key;
}
}
return null;
}
}