Java Random Number Generator

The Java random function is one of the Java Math Library function which is used to return the Pseudo random numbers between Zero and One.

In this article we will show you, How to use Math.random function in Java Programming language with example.

TIP: The value generated by the Java random function is from 0 (included) and less than 1.

Syntax of Java Random Number Generator

The basic syntax of the Math.random in Java Programming language is as shown below.

static double random(); //Return Type is Double

// In order to use in program: 
Math.random();

Java Random Number Generator example

The Java Math.random Function is used to return the Pseudo random numbers between 0 to 1.

In this Java program, We are going to generate the random numbers in Java, and display the output

JAVA CODE

// Java Random Number Generator (Math.random) example

package MathFunctions;

public class RandomMethod {
	public static void main(String[] args) {
		
		System.out.println("\nRandom Number is = " + Math.random());
		System.out.println("\nRandom Numbers is = " + Math.random());

		System.out.println("\nRandom Numbers is = " + Math.random());
		System.out.println("\nRandom Numbers is = " + Math.random());
	}
}

OUTPUT

NOTE: If you observe the above screenshot, We called the Java Math.random Function for four times and it is returning four different (random) values.

Java Random Number Generator example 2

In this Java program we will show you, How to store the random values into an array. Here, we are going to declare an array of double type and fill that array with random valued generated by Java Math.random.

JAVA CODE

package MathFunctions;

public class RandomMethodInArray {
	public static void main(String[] args) {
		
		double [] myArray = new double[10];

		for (int i = 0; i < 10; i++) {
			myArray[i] = Math.random();
		}
		//Displaying Result
		for (int i = 0; i < myArray.length; i++) {
			System.out.println("Array Element = " + myArray[i]);
		}
	}
}

OUTPUT

ANALYSIS

First, We declared an empty double Array.

double [] myArray = new double[10];

Next, We used the Java For Loop to iterate the Array. Within the For Loop, we initialized the i value as 0. Next, compiler will check for the condition (i < 10). As along the condition is True statement inside the for loop will be executed.

for (int i = 0; i < 10; i++) {

Following Java Random statements will store the random values into an array. If you observe the code snippet, we are assigning each index position with one random value.

Here, compiler will call the Math.random method (static double random() ) to return random value betwen 0 and 1

myArray[i] = Math.random();

Next, To display the array values We used another Java For Loop to iterate the Array. Within the For Loop, we initialized the i value as 0 and the compiler will check the condition (i < myArray.length). As along the condition is True statement inside the for loop will be executed.

TIP: myArray.length is used to find the length of an array.

for (int i = 0; i < myArray.length; i++) {

Following statements will print the output.

System.out.println("Array Element = " + myArray[i]);

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