Java ThreadLocalRandom doubles() method

The doubles() method of Java ThreadLocalRandom class returns an effectively unlimited stream of pseudorandom double values. Each value must lie between 0 and 1. This method overrides doubles in class Random.

Syntax:

Parameter:

Returns:

This method returns a stream of pseudorandom double values.

Example

import java.util.concurrent.ThreadLocalRandom;

public class ThreadLocalRandomDoublesExample1 {
    public static void main(String[] args) {
    	
    	// Returns a stream of pseudorandom double values   	
    	System.out.println("stream of pseudorandom double value is: " +ThreadLocalRandom.current().doubles());
    }
}

Output:

stream of pseudorandom double value is: java.util.stream.DoublePipeline$Head@7382f612

Java ThreadLocalRandom doubles(long streamSize) method

The doubles(long streamSize) method of Java ThreadLocalRandom class returns a stream producing the given streamSize number of pseudorandom double values. Each value must conform to the given 0 (inclusive) and 1 (exclusive). This method overrides doubles in class Random.

Syntax:

Parameter:

streamSize - It is the number of values to generate

Returns:

This method returns a stream of double values.

Exception:

IllegalArgumentException: This exception will throw if the streamSize is less than zero.

Example 1

import java.util.concurrent.ThreadLocalRandom;

public class ThreadLocalRandomDoublesExample2 {
    public static void main(String[] args) {
    	
    	// Returns a stream of double values   	
    	System.out.println("stream of double value is: " +ThreadLocalRandom.current().doubles(100));
    }
}

Output:

stream of double value is: java.util.stream.DoublePipeline$Head@136432db

Example 2

import java.util.concurrent.ThreadLocalRandom;

public class ThreadLocalRandomDoublesExample3 {
    public static void main(String[] args) {
    	
    	// Returns exception because streamSize is negative 
    	System.out.println("stream of double value is: " +ThreadLocalRandom.current().doubles(-20));
    }
}

Output:

Exception in thread "main" java.lang.IllegalArgumentException: size must be non-negative
	at java.base/java.util.concurrent.ThreadLocalRandom.doubles(Unknown Source)
	at tests.JavaNextIntExample1.main(ThreadLocalRandomDoublesExample2.java:8)

Java ThreadLocalRandom doubles(double randomNumberOrigin, double randomNumberBound) method

The doubles(double randomNumberOrigin, double randomNumberBound) method of Java ThreadLocalRandom class returns an effectively unlimited stream of pseudorandom double values. Each value must conform to the given origin (inclusive) and bound (exclusive). This method overrides doubles in class Random.

Syntax:

public DoubleStream doubles(double randomNumberOrigin, double randomNumberBound)

Parameter:

randomNumberOrigin: It is the origin (inclusive) of each random value.

randomNumberBound: It is the bound (exclusive) of each random value.

Returns:

This method returns a stream of pseudorandom double values.

Exception:

IllegalArgumentException: This exception will throw if randomNumberOrigin is greater than or equal to randomNumberBound.

Example 1

import java.util.concurrent.ThreadLocalRandom;

public class ThreadLocalRandomDoublesExample4 {
    public static void main(String[] args) {
    	
    	// Returns a stream of pseudorandom double values   	
    	System.out.println("stream of pseudorandom double value is: " +ThreadLocalRandom.current().doubles(20, 30));
    }
}

Output:

stream of pseudorandom double value is: java.util.stream.DoublePipeline$Head@7382f612

Example 2

import java.util.concurrent.ThreadLocalRandom;

public class ThreadLocalRandomDoublesExample5 {
    public static void main(String[] args) {
    	
    	// Returns exception because origin is greater than bound  	
    	System.out.println("stream of pseudorandom double value is: " +ThreadLocalRandom.current().doubles(30, 10));
    }
}

Output:

Exception in thread "main" java.lang.IllegalArgumentException: bound must be greater than origin
	at java.base/java.util.concurrent.ThreadLocalRandom.doubles(Unknown Source)
	at tests.JavaNextIntExample.main(ThreadLocalRandomDoublesExample2.java:7)

Java ThreadLocalRandom doubles(long streamSize, double randomNumberOrigin, double randomNumberBound) method

The doubles(long streamSize, double randomNumberOrigin, double randomNumberBound) method of Java ThreadLocalRandom class returns a stream producing the given streamSize number of pseudorandom double values. Each value must conform to the given origin (inclusive) and bound (exclusive). This method overrides doubles in class Random.

Syntax:

public DoubleStream doubles(long streamSize, double randomNumberOrigin, double randomNumberBound)

Parameter:

streamSize - It is the number of values to generate

randomNumberOrigin - It is the origin (inclusive) of each random value

randomNumberBound - It is the bound (exclusive) of each random value

Returns:

This method returns a stream of pseudorandom double values.

Exception:

IllegalArgumentException: This exception will throw if the streamSize is less than zero.
IllegalArgumentException: This exception will throw if the randomNumberOrigin is greater than or equal to randomNumberBound.

Example 1

import java.util.concurrent.ThreadLocalRandom;

public class ThreadLocalRandomDoublesExample6 {
    public static void main(String[] args) {
    	
    	// Returns a stream of pseudorandom double values   	
    	System.out.println("stream of pseudorandom double value is: " +ThreadLocalRandom.current().doubles(10, 20, 30));
    }
}

Output:

stream of pseudorandom double value is: java.util.stream.DoublePipeline$Head@7382f612

Example 2

import java.util.concurrent.ThreadLocalRandom;

public class ThreadLocalRandomDoublesExample7 {
    public static void main(String[] args) {
    	
    	// Returns exception because steamSize is negative   	
    	System.out.println("stream of pseudorandom double value is: " +ThreadLocalRandom.current().doubles(-10, 20, 30));
    }
}

Output:

Exception in thread "main" java.lang.IllegalArgumentException: size must be non-negative
	at java.base/java.util.concurrent.ThreadLocalRandom.doubles(Unknown Source)
	at tests.JavaNextIntExample1.main(ThreadLocalRandomDoublesExample2.java:7)

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