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PORandom password generation
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copied!<p>I wrote a program where I want some output which starts with an uppercase letter + digit. Then some random generation from the allowed characters.</p> <p>But I find the output contains spaces like: <code>k r w ea</code>. Whereas I expected : <code>W3krwea</code>.</p> <p>I don't know why these spaces appear in my output.</p> <pre><code>import java.util.Random; import sun.security.util.Password; /* * To change this template, choose Tools | Templates * and open the template in the editor. */ /** * * @author taskin */ public class RPG { public static String generate(String allowedCharacters, boolean mustHaveUppercase, boolean mustHaveDigit, int minLength, int maxLength) { Random rand=new Random(); String rp = null; // Random Password int Length=allowedCharacters.length(); char[] password=new char[25]; int [] asc=new int[18]; char[] UpperCase=new char[25]; char[] Digit=new char[25]; char[] Mixed=new char[25]; int point1=0,point2=0,point3=0; for (int i=0;i<Length;i++) { asc[i]=(int)allowedCharacters.charAt(i); } for (int k=0;k<Length;k++) { if (asc[k]>=65 && asc[k]<=90) { UpperCase[point1]=(char)asc[k]; point1++; continue; } else if (asc[k]>=48 && asc[k]<=57) { Digit[point2]=(char)asc[k]; point2++; continue; } else { Mixed[point3]=(char)asc[k]; point3++; } } StringBuilder strbld=new StringBuilder(); int length=maxLength-minLength+1+minLength; strbld.append(UpperCase[rand.nextInt(UpperCase.length)]);//get a uppercase char strbld.append(Digit[rand.nextInt(Digit.length)]);//get a digit for(int i=0;i<length-2;i++){ strbld.append(Mixed[rand.nextInt(Mixed.length)]); } rp=strbld.toString(); // Your code to set rp appropriately goes here return rp; } public static void main(String[] args) { String allowedCharacters = "weakPasSWorD1234$*"; boolean mustHaveUppercase = true; boolean mustHaveDigit = true; int minLength = 3; int maxLength = 20; String randomPassword = generate(allowedCharacters, mustHaveUppercase, mustHaveDigit, minLength, maxLength); System.out.println("Random password: " + randomPassword); } } </code></pre>

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