Hi Friend,

Try the following code:

import java.io.*;
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());
sb.append(charset.charAt(pos));
}
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");
out.newLine();

Scanner input=new Scanner(System.in);
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 type=input.next();
if(type.equals("Numeric")){
String charset = "0123456789";
System.out.println("Generated Password- "+RandomPassword.getRandomString(len,charset));
out.write(st+" "+RandomPassword.getRandomString(len,charset));
out.newLine();
}
else if(type.equals("Alphanumeric")){
String charset = "0123456789abcdefghijklmnopqrstuvwxyz";
System.out.println("Generated Password- "+RandomPassword.getRandomString(len,charset));
out.write(st+" "+RandomPassword.getRandomString(len,charset));
out.newLine();
}
else if(type.equals("Alphabetic")){
String charset = "abcdefghijklmnopqrstuvwxyz";
System.out.println("Generated Password- "+RandomPassword.getRandomString(len,charset));
out.write(st+" "+RandomPassword.getRandomString(len,charset));
out.newLine();
}
out.close();
}
}

Thanks