java中遍历MAP,嵌套map的几种方法

java中遍历MAP，嵌套map的⼏种⽅法java中遍历MAP的⼏种⽅法

Map<String,String> map=new HashMap<String,String>();

map.put("username", "qq");

map.put("passWord", "123");

map.put("userID", "1");

map.put("email", "qq@qq");

1.⽤for循环

for (Map.Entry<String, String> entry : Set()) {

System.out.println(">>>>>>>>" + Key() + ", " + Value());

}

2.⽤keySet()迭代

Iterator<String> it=map.keySet().iterator();

while(it.hasNext()){

System.out.println("<<<<<<<<" + it.next().toString() + ", " + (it.next().toString()));

}

3. ⽤entrySet()迭代

Iterator<Entry<String, String>> it = Set().iterator();

while (it.hasNext()) {

Map.Entry<String, String> entry1 = it.next();

System.out.Key().toString() + "==" + Value().toString());

}

public static void main(String[] a) {

Map<String,Map<String,String>> requests = new HashMap<String, Map<String,String>>();

Map<String,String> headers = new HashMap<String,String>();

Map<String,String> cookies = new HashMap<String,String>();

requests.put("header", headers);

requests.put("cookie", cookies);

headers.put("ua", "uaaaaaaaaaaaaaaaaaa");

aaaaaaaaaaaaaaaaaacookies.put("sessionid1", "sessionid1111111111");

headers.put("accept", "acceptttttttttttttttt");

cookies.put("sessionid2", "sessionid2222222222");

Set<String> keySet = requests.keySet();

for(Iterator<String> it = keySet.iterator();it.hasNext();) {

String key = it.next();

Map<String,String> map = (key);

Set<Entry<String, String>> entrySet = Set();

for(Iterator<Entry<String, String>> it2 = entrySet.iterator();it2.hasNext();) {

Map.Entry<String, String> me = ();

System.out.println(key+"^"+me.getKey() + "^" + me.getValue());

}

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