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/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
 
private static void permutation(char[] perm, int pos, String str) {
    if (pos == perm.length) {
        System.out.println(new String(perm));
    } else {
        for (int i = 0 ; i < str.length() ; i++) {
            perm[pos] = str.charAt(i);
            permutation(perm, pos+1, str);
        }
    }
}	
 
 
 
	public static void main (String[] args) throws java.lang.Exception
	{
char[] perm = new char[5];
permutation(perm, 0, "2424");
	}
}

Success #stdin #stdout 0.1s 55340KB

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Standard input is empty

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