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uday kumar
1 Answer(s)      7 years ago
Posted in : Swing AWT
sir howcan i creat a buttion for generating randompassword whose length are fix upto 5-15, the condition is every time we get differnt password. we have to take input from user side as:-
1.Text for which password to be generated.
2.Length of password to be generated.(5-15).
3.Types of password User wants to generat:-
(a). Alphanumeric
(b). Numeric
(c). Alphabetic

Generated Password-JU12H6
Inside filename.txt-Text From User Generated Password

View Answers

August 27, 2010 at 11:36 AM

Hi Friend,

Try the following code:

import java.util.*;

public class RandomPassword {
public static String getRandomString(int length, String charset) {
Random r= new Random(System.currentTimeMillis());
StringBuffer sb = new StringBuffer();
for (int i = 0; i < length; i++) {
int pos = r.nextInt(charset.length());
return sb.toString();
public static void main(String[] args)throws Exception {
File file = new File("C:/filename.txt");
FileWriter fstream = new FileWriter(file,true);
BufferedWriter out = new BufferedWriter(fstream);
out.write("Text From User Generated Password");

Scanner input=new Scanner(;
System.out.print("Text for which password to be generated: ");
String st=input.nextLine();
System.out.print("Length of password to be generated.(5-15): ");
int len=input.nextInt();
System.out.print("Type of password User wants to generate: Numeric or Alphanumeric or Alphabetic:");
String charset = "0123456789";
System.out.println("Generated Password- "+RandomPassword.getRandomString(len,charset));
out.write(st+" "+RandomPassword.getRandomString(len,charset));
else if(type.equals("Alphanumeric")){
String charset = "0123456789abcdefghijklmnopqrstuvwxyz";
System.out.println("Generated Password- "+RandomPassword.getRandomString(len,charset));
out.write(st+" "+RandomPassword.getRandomString(len,charset));
else if(type.equals("Alphabetic")){
String charset = "abcdefghijklmnopqrstuvwxyz";
System.out.println("Generated Password- "+RandomPassword.getRandomString(len,charset));
out.write(st+" "+RandomPassword.getRandomString(len,charset));



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