Java ThreadLocalRandom nextDouble() method

The nextDouble() method of Java ThreadLocalRandom class returns a pseudorandom double value between 0 and 1. This method overrides the nextDouble in class Random.

Syntax:

Parameter:

Returns:

This method returns a pseudorandom double value between 0 and 1.

Example

import java.util.concurrent.ThreadLocalRandom;

public class ThreadLocalRandomNextDoubleExample1 {
    public static void main(String[] args) {
    	
    	// Returns a pseudorandom double value between 0 and 1   	
    	System.out.println("Random double value is: " +ThreadLocalRandom.current().nextDouble());
    }
}

Output:

Random double value is: 0.2967936086945462

Java ThreadLocalRandom nextDouble(double n) method

The nextDouble(double n) method of Java ThreadLocalRandom class returns a pseudorandom. It returns the uniformly distributed double value between 0 and the specified value.

Syntax:

Parameter:

n: It is the bound on the random number. It must be positive.

Returns:

This method returns the next value.

Exception:

IllegalArgumentException - This exception will throw if n is not positive.

Example 1

import java.util.concurrent.ThreadLocalRandom;

public class ThreadLocalRandomNextDoubleExample2 {
    public static void main(String[] args) {
    	
    	// Returns a pseudorandom, uniformly distributed double value between 0 and 10000
    	System.out.println("Random double value is: " +ThreadLocalRandom.current().nextDouble(10000));
    }
}

Output:

Random double value is: 172.58603834580222

Example 2

import java.util.concurrent.ThreadLocalRandom;

public class ThreadLocalRandomNextDoubleExample3 {
    public static void main(String[] args) {
    	
    	// Returns a pseudorandom, uniformly distributed double value between 0 and 5000
    	System.out.println("Random double value is: " +ThreadLocalRandom.current().nextDouble(5000));
    }
}

Output:

Random double value is: 3961.37003622182

Example 3

import java.util.concurrent.ThreadLocalRandom;

public class ThreadLocalRandomNextDoubleExample4 {
    public static void main(String[] args) {
    	
    	// Returns exception because specified value is negative    	System.out.println("Random double value is: " +ThreadLocalRandom.current().nextDouble(-5000));
    }
}

Output:

Exception in thread "main" java.lang.IllegalArgumentException: bound must be positive
	at java.base/java.util.concurrent.ThreadLocalRandom.nextDouble(Unknown Source)
	at tests.JavaNextDoubleExample2.main(ThreadLocalRandomNextDoubleExample3.java:7)

Java ThreadLocalRandom nextDouble(double least, double bound) method

The nextDouble(double least, double bound) method of Java ThreadLocalRandom class returns a pseudorandom. It returns the uniformly distributed double value between the given least value and bound.

Syntax:

Parameter:

least - It is the least value.

bound - It is the upper bound (exclusive).

Returns:

This method returns the next value.

Exception:

IllegalArgumentException - This exception will throw if least is greater than or equal to bound.

Example 1

import java.util.concurrent.ThreadLocalRandom;

public class ThreadLocalRandomNextDoubleExample5 {
    public static void main(String[] args) {
    	
    	// Returns a pseudorandom, uniformly distributed double value between 5000 and 7000
    	System.out.println("Random double value is: " +ThreadLocalRandom.current().nextDouble(5000, 7000));
    }
}

Output:

Random double value is: 5240.122245986785

Example 2

import java.util.concurrent.ThreadLocalRandom;

public class ThreadLocalRandomNextDoubleExample6 {
    public static void main(String[] args) {
    	
    	// Returns a pseudorandom, uniformly distributed double value between 10000 and 20000
    	System.out.println("Random double value is: " +ThreadLocalRandom.current().nextDouble(10000, 20000));
    }
}

Output:

Random double value is: 17190.013525593356

Example 3

import java.util.concurrent.ThreadLocalRandom;

public class ThreadLocalRandomNextDoubleExample7 {
    public static void main(String[] args) {
    	
    	// Returns exception because least value is greater than bound
    	System.out.println("Random double value is: " +ThreadLocalRandom.current().nextDouble(50000, 3000));
    }
}

Output:

Exception in thread "main" java.lang.IllegalArgumentException: bound must be greater than origin
	at java.base/java.util.concurrent.ThreadLocalRandom.nextDouble(Unknown Source)
	at tests.JavaNextDoubleExample2.main(ThreadLocalRandomNextDoubleExample3.java:7)

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