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  1. import java.util.*;
  2. import java.lang.*;
  3. import java.io.*;
  4. import java.security.SecureRandom;
  5. /**
  6.   *  @author re
  7.   *  http://j...content-available-to-author-only...i.al
  8.   */
  9. class Ideone
  10. {
  11. 	String charactersToBeUsed;
  12.  
  13.     private static final String UPPERCASE_CHARACTERS = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
  14.     private static final int DEFAULT_PASSWORD_LENGTH = 8;
  15.  
  16.     // default constructor
  17.     Ideone() { this(UPPERCASE_CHARACTERS); }
  18.     // constructor
  19.     Ideone(String characters) { this.charactersToBeUsed = characters; }
  20.  
  21.     public String generate() { return generate(DEFAULT_PASSWORD_LENGTH); }
  22.  
  23.     public String generate(int length) {
  24.         char[] password = new char[length];
  25.  
  26.         char[] possibleCharacters = charactersToBeUsed.toCharArray();
  27.         SecureRandom r = new SecureRandom();
  28.  
  29.         for (int i = 0; i < length; i++) {
  30.             password[i] = possibleCharacters[r.nextInt(possibleCharacters.length)];
  31.         }
  32.         return new String(password);
  33.     }
  34.  
  35. 	private enum EnumAsciiCharacters {
  36. 	    UPPERCASE( "ABCDEFGHIJKLMNOPQRSTUVWXYZ" ),
  37. 	    LOWERCASE( "abcdefghijklmnopqrstuvwxyz" ),
  38. 	    NUMERIC( "1234567890" ),
  39. 	    SPECIAL( "~!@#$%^&*()_|" );
  40.  
  41. 	    private String characters;
  42.  
  43. 	    @Override
  44. 	    public String toString() {
  45. 	      return this.characters;
  46. 	    }
  47.  
  48. 	    private EnumAsciiCharacters( String characters ) {
  49. 	      this.characters = characters;
  50. 	    }
  51. 	} // EnumAsciiCharacters
  52.  
  53. 	public static void main (String[] args) throws java.lang.Exception
  54. 	{
  55. 		String useThisCharacters = 
  56. 			String.format(
  57. 				"%s%s%s",
  58. 				EnumAsciiCharacters.UPPERCASE, EnumAsciiCharacters.LOWERCASE, EnumAsciiCharacters.SPECIAL
  59. 			);
  60. 	    Ideone pg = new Ideone(useThisCharacters);
  61. 	    System.out.println(pg.generate());
  62. 	}
  63. }
Success #stdin #stdout 0.13s 320448KB
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vbtRZmo@
https://ideone.com/vGjsB6
simple password generator
language:
Java (HotSpot 12)
created:
8 years ago
visibility:
public

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