Randomly Generating Values - Java Language Basics

Java examples for Language Basics:Random

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Solution 1

Use the java.util.Random class to help generate the random numbers.

Solution 2

Make use of the Math.random() method.

Demo Code


import java.util.Random;

public class Main {

  public static void main(String[] args) {
    // Create a new instance of the Random class
    Random random = new Random();
    System.out.println("Random: " + random);

    // Generates a random Integer
    int myInt = random.nextInt();
    System.out.println("Random int: " + myInt);
    // Generates a random Double value
    double myDouble = random.nextDouble();
    System.out.println("Random double: " + myDouble);

    // Generates a random float
    float myFloat = random.nextFloat();
    System.out.println("Random float: " + myFloat);

    // Generates a random Gaussian double
    // mean 0.0 and standard deviation 1.0
    double gausDouble = random.nextGaussian();
    System.out.println("Random Gaussian double: " + gausDouble);
    // Generates a random Long
    long myLong = random.nextLong();
    System.out.println("Random long: " + myLong);
    // Generates a random boolean
    boolean myBoolean = random.nextBoolean();
    System.out.println("Random boolean: " + myBoolean);
    double rand = Math.random();
    System.out.println("Random double via Math: " + rand);

  }//from  w  w  w . j  a  v  a 2s .  co m
}

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