Three ways to traverse map in Java

three ways to traverse map:1. Use keyset traversal, while loop;2. Use EntrySet traversal, while loop;3. Use for loop traversal. tell you a little secret: (The next ↓ is the test code, most love to see the code, wordy and more useless) people I don't tell him oh.

Import java.util.*;
//0 my main interfacepublic class Maptraverse {public static void main (string[] args) {string[] str = {' I love you ', ' You love he ', ' he love he ' R "," She Love Me "}; Map<integer, string> m = new HashMap (); for (int i=0; i<str.length; i++) {m.put (I, Str[i]);} System.out.println ("1. Using keyset traversal, while loop"); Myketset (m); System.out.println ("2. Using EntrySet traversal, while loop"); Myentryset (m); System.out.println ("3. Use for loop traversal"); Myfor (m);}

//1 My Myketset () methodpublic static void Myketset (Map<integer, string> m) {Set s = (set<integer>) m.keyset (); Iterator<integer > it = s.iterator (); int Key; String Value;while (It.hasnext ()) {Key = It.next (); value = (String) m.get (key); System.out.println (key+ ": \ T" +value);}}

//2 my Myentryset () methodpublic static void Myentryset (Map m) {Set s = m.entryset (); Iterator<map.entry<integer, string>> it = S.iterato R (); Map.entry<integer, string> entry;int Key; String Value;while (It.hasnext ()) {entry = It.next (); Key = Entry.getkey (); value = Entry.getvalue (); System.out.println (key+ ": \ T" +value);}}

//3 My Myfor () methodpublic static void Myfor (Map<integer, string> m) {int Key; String value;for (Map.entry<integer, string> entry:m.entryset ()) {Key = Entry.getkey (); value = Entry.getvalue (); System.out.println (key+ ": \ T" +value);}}}



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Three ways to traverse map in Java