packagecom.cn.util;importjava.util.ArrayList;importjava.util.HashMap;importjava.util.Iterator;importjava.util.List;importjava.util.Map;importjava.util.Set;//循环遍历map的方法

public classUtil {public static voidmain(String[] args) {

Map tempMap = new HashMap();

tempMap.put("a", 1);

tempMap.put("b", 2);

tempMap.put("c", 3);//JDK1.4中//遍历方法一 hashmap entrySet() 遍历

System.out.println("方法一");

Iterator it=tempMap.entrySet().iterator();while(it.hasNext()) {

Map.Entry entry=(Map.Entry) it.next();

Object key=entry.getKey();

Object value=entry.getValue();

System.out.println("key=" + key + " value=" +value);

}

System.out.println("");//JDK1.5中,应用新特性For-Each循环//遍历方法二

System.out.println("方法二");for (Map.Entryentry : tempMap.entrySet()) {

String key=entry.getKey().toString();

String value=entry.getValue().toString();

System.out.println("key=" + key + " value=" +value);

}

System.out.println("");//遍历方法三 hashmap keySet() 遍历

System.out.println("方法三");for (Iterator i =tempMap.keySet().iterator(); i.hasNext();) {

Object obj=i.next();

System.out.println(obj);//循环输出key

System.out.println("key=" + obj + " value=" +tempMap.get(obj));

}for (Iterator i =tempMap.values().iterator(); i.hasNext();) {

Object obj=i.next();

System.out.println(obj);//循环输出value

}

System.out.println("");//遍历方法四 treemap keySet()遍历

System.out.println("方法四");for(Object o : tempMap.keySet()) {

System.out.println("key=" + o + " value=" +tempMap.get(o));

}

System.out.println("11111");//java如何遍历Map map = new HashMap ();

System.out

.println("java 遍历Map map = new HashMap ();");

Map map = new HashMap();

Set keys =map.keySet();

Iterator iterator =keys.iterator();while(iterator.hasNext()) {

String key=iterator.next();

ArrayList arrayList=map.get(key);for(Object o : arrayList) {

System.out.println(o+ "遍历过程");

}

}

System.out.println("2222");

Map mapList = new HashMap();for(Map.Entry entry : mapList.entrySet()) {

String key=entry.getKey().toString();

List values =(List) entry.getValue();for(String value : values) {

System.out.println(key+ " --> " +value);

}

}

}

}