Program: How to create random string with random characters?

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

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());
    }
}

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