java 遍历map

package com.jackey.topic;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;

//循环遍历map的方法
public class CircleMap {
?public static void main(String[] args) {
??Map<String, Integer> tempMap = new HashMap<String, Integer>();
??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.Entry<String, Integer> entry : 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 <String, ArrayList> map = new HashMap <String,
??// ArrayList>();
??System.out
????.println("java? 遍历Map <String, ArrayList> map = new HashMap <String, ArrayList>();");
??Map<String, ArrayList> map = new HashMap<String, ArrayList>();
??Set<String> keys = map.keySet();
??Iterator<String> 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<String, List> mapList = new HashMap<String, List>();
??for (Map.Entry entry : mapList.entrySet()) {
???String key = entry.getKey().toString();
???List<String> values = (List) entry.getValue();
???for (String value : values) {
????System.out.println(key + " --> " + value);
???}
??}
?}
}