Generate all combinations for Brute Force Attack

The below snippet lets you generate different combinations of your input.


public class className {
    private StringBuilder output = new StringBuilder();
    private final String inputstring;
    public Combine( final String str ){
        inputstring = str;
        System.out.println("The input string  is  : " + inputstring);
    }
    
    
    public static void main (String args[])
    {
      Combine combo= new Combine("123#!@");
        System.out.println("");
        System.out.println("");
        System.out.println("All possible combinations are :  ");
        System.out.println("");
        System.out.println("");
        combo.combine();
    }
    
    public void combine()
    {
      combine(0);
    }
    
    private void combine(int start)
    {
      for( int i = start; i < inputstring.length(); ++i )
      {
            output.append( inputstring.charAt(i) );
            System.out.println( output );
            if ( i < inputstring.length() )
            combine( i + 1);
            output.setLength( output.length() - 1 );
        }
    }
}