Exemplo Código de vários métodos para atravessar o mapa em java

Java 中遍历 mapa 的几种方法

Mapa <string, string> map = new hashmap <string, string> (); map.put ("nome de usuário", "qq"); map.put ("senha", "123"); map.put ("userID", "1"); map.put ("Email", "[email protected]"); Mapa <string, string> map = new hashmap <string, string> (); map.put ("nome de usuário", "qq"); map.put ("senha", "123"); map.put ("userID", "1"); map.put ("Email", "[email protected]");

第一种用 para 循环

para (map.entry <string, string> entrada: map.entrySet ()) {system.out.println (entradas.getKey ()+"--->"+entrada.getValue ()); } para (map.entry <string, string> Entrada: map.entrySet ()) {System.out.println (entradas.getKey ()+"--->"+entradas.getValue ()); }

第二种用迭代

Set set = map.entrySet (); Iterator i = set.iterator (); while (i.hasNext ()) {map.entry <string, string> entradas1 = (map.entry <string, string>) i.next (); System.out.println (entradas1.getKey ()+"=="+entradas1.getValue ()); } Set set = map.entrySet (); Iterator i = set.iterator (); while (i.hasNext ()) {map.entry <string, string> entradas1 = (map.entry <string, string>) i.next (); System.out.println (entradas1.getKey ()+"=="+entradas1.getValue ()); }

用 keyset () 迭代

Iterator it = map.keyset (). Iterator (); while (it.hasnext ()) {string key; Valor da string; key = it.Next (). ToString (); value = map.get (chave); System.out.println (chave+"-"+valor); } Iterator it = map.keyset (). Iterator (); while (it.hasnext ()) {string key; Valor da string; key = it.Next (). ToString (); value = map.get (chave); System.out.println (chave+"-"+valor); }

用 Entryset () 迭代

Iterator it = map.entrySet (). Iterator (); System.out.println (map.entrySet (). Size ()); Chave de string; Valor da string; while (it.hasNext ()) {map.entry Entry = (map.entry) it.Next (); key = Entry.getKey (). ToString (); value = Entry.getValue (). ToString (); System.out.println (chave+"===="+valor); }

以上就是对 Java 遍历 mapa 的资料整理 ， 后续继续补充相关资料 ， 谢谢大家对本站的支持！