Java: Shuffle characters in a string

'Collection.shuffle' method can be used to shuffle characters in a string.

public static void shuffle(List<?> list)

public static void shuffle(List<?> list, Random rnd)

Example

public static String shuffleString(String string) {

         List<String> letters = Arrays.asList(string.split(""));

         Collections.shuffle(letters);

         StringBuilder builder = new StringBuilder();

         for (String letter : letters) {

                  builder.append(letter);

         }

         return builder.toString();

}

App.java

package com.sample.app;

import java.util.Arrays;
import java.util.Collections;
import java.util.List;

public class App {

 public static String shuffleString(String string) {
  List<String> letters = Arrays.asList(string.split(""));
  Collections.shuffle(letters);
  StringBuilder builder = new StringBuilder();
  for (String letter : letters) {
   builder.append(letter);
  }
  return builder.toString();
 }

 public static void main(String args[]) throws Exception {
  String str = "Hello Wolrd";
  String result = shuffleString(str);

  System.out.println("Actual String : " + str);
  System.out.println("Shuffled String : " + result);
 }
}

Sample Output

Actual String : Hello Wolrd

Shuffled String : eHdolWll ro

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