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How to generate a Random Number in Java 

The following example shows generating a random int, long, float, double etc. in Java.

File Name  :  
com/bethecoder/articles/basics/random/RandomTest.java 
Author  :  Sudhakar KV
Email  :  kvenkatasudhakar@gmail.com
   
package com.bethecoder.articles.basics.random;

import java.util.Arrays;
import java.util.Random;

public class RandomTest {

  /**
   @param args
   */
  public static void main(String[] args) {

    Random rand = new Random();
    
    System.out.println(rand.nextBoolean());
    System.out.println(rand.nextDouble());
    System.out.println(rand.nextFloat());
    System.out.println(rand.nextGaussian());
    System.out.println(rand.nextInt());
    System.out.println(rand.nextLong());
    System.out.println(rand.nextInt(17291729));
    
    byte [] bytes = new byte[12];
    rand.nextBytes(bytes);
    System.out.println(Arrays.toString(bytes));
  }

}
   

It gives the following output,
true
0.9208379651206896
0.12319869
1.0118488718946061
2033383028
-6555723401767464176
11676418
[58, -116, 78, 126, 71, 31, 117, -101, 80, 0, 67, -10]

File Name  :  
com/bethecoder/articles/basics/random/RandomTest2.java 
Author  :  Sudhakar KV
Email  :  kvenkatasudhakar@gmail.com
   
package com.bethecoder.articles.basics.random;


public class RandomTest2 {

  /**
   @param args
   */
  public static void main(String[] args) {

    //Returns a value between 0 and 1
    double value = Math.random();
    System.out.println(value);
    
    //Random number between 0 and 1729
    int n = (int) (Math.random() 1729);
    System.out.println(n);
  }

}
   

It gives the following output,
0.14997177505825
488


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