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Program: How to create random string with random characters?


Description:

Write a program to generate random string of length 10 charactors. Every time you call the method, the program should generate random string.


Code:
package com.java2novice.random;

import java.util.Random;

public class MyStringRandomGen {

	private static final String CHAR_LIST = 
		"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890";
	private static final int RANDOM_STRING_LENGTH = 10;
	
	/**
	 * This method generates random string
	 * @return
	 */
	public String generateRandomString(){
        
		StringBuffer randStr = new StringBuffer();
        for(int i=0; i<RANDOM_STRING_LENGTH; i++){
        	int number = getRandomNumber();
        	char ch = CHAR_LIST.charAt(number);
        	randStr.append(ch);
        }
        return randStr.toString();
    }
	
	/**
     * This method generates random numbers
     * @return int
     */
    private int getRandomNumber() {
        int randomInt = 0;
        Random randomGenerator = new Random();
        randomInt = randomGenerator.nextInt(CHAR_LIST.length());
        if (randomInt - 1 == -1) {
            return randomInt;
        } else {
            return randomInt - 1;
        }
    }
    
    public static void main(String a[]){
    	MyStringRandomGen msr = new MyStringRandomGen();
    	System.out.println(msr.generateRandomString());
    	System.out.println(msr.generateRandomString());
    	System.out.println(msr.generateRandomString());
    	System.out.println(msr.generateRandomString());
    	System.out.println(msr.generateRandomString());
    	System.out.println(msr.generateRandomString());
    	System.out.println(msr.generateRandomString());
    }
}


Output:
UdX5PwalMI
qj62F7zuoR
ndJUNiHSlh
YohYpF5MfA
mwX9UhI7Ci
bCn5bsk2em
pzMXQDYaDx
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List of Random class sample programs:

  1. Basic random number generator.
  2. How to generate random numbers in the given range?
  3. How to generate same random sequence everytime?
  4. How to change Random class seed value?
  5. How to create random string with random characters?
Knowledge Centre
Transient and Volatile Modifiers
Transient: The transient modifier applies to variables only and it is not stored as part of its object's Persistent state. Transient variables are not serialized.

Volatile: Volatile modifier applies to variables only and it tells the compiler that the variable modified by volatile can be changed unexpectedly by other parts of the program.

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Reference: Java™ Platform Standard Ed. 6 - API Specification | Java is registered trademark of Oracle.
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