Java ThreadLocalRandom nextLong() method

The nextLong() method of Java ThreadLocalRandom class returns a pseudorandom long value. This method overrides the nextLong in class Random.

Syntax:

Parameter:

Returns:

This method returns a pseudorandom long value.

Example

import java.util.concurrent.ThreadLocalRandom;

public class ThreadLocalRandomNextLongExample1 {
    public static void main(String[] args) {
    	
    	// Returns a pseudorandom long value    	
    	System.out.println("Random long value is: " +ThreadLocalRandom.current().nextLong());
    }
}

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Output:

Random long value is: 8925561344935968546

Java ThreadLocalRandom nextLong(long bound) method

The nextLong(long bound) method of Java ThreadLocalRandom class returns a pseudorandom. It returns the uniformly distributed value between 0 and bound.

Syntax:

Parameter:

bound: 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 ThreadLocalRandomNextLongExample2 {
    public static void main(String[] args) {

        // Returns a pseudorandom, uniformly distributed long value between 0 and 2000
        System.out.println("Random long value is: " + ThreadLocalRandom.current().nextLong(2000));
    }
}

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Output:

Random long value is: 1703

Example 2

import java.util.concurrent.ThreadLocalRandom;

public class ThreadLocalRandomNextLongExample3 {
    public static void main(String[] args) {
    	
    	// Returns exception because bound is negative 
    	System.out.println("Random long value is: " +ThreadLocalRandom.current().nextInt(-10));
    }
}

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Output:

Exception in thread "main" java.lang.IllegalArgumentException: bound must be positive
	at java.base/java.util.concurrent.ThreadLocalRandom.nextInt(Unknown Source)
	at tests.JavaNextLongExample2.main(ThreadLocalRandomNextLongExample2.java:7)

Java ThreadLocalRandom nextLong(long origin, long bound) method

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

Syntax:

Parameter:

origin - It is the least value.

bound - It is the upper bound (exclusive).

Returns:

This method returns a pseudorandom long value between the origin and the bound.

Exception:

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

Example 1

import java.util.concurrent.ThreadLocalRandom;

public class ThreadLocalRandomNextLongExample4 {
    public static void main(String[] args) {

        // Returns a pseudorandom, uniformly distributed long value between 10000 and 50000
        System.out.println("Random long value is: " + ThreadLocalRandom.current().nextLong(10000, 50000));
    }
}

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Output:

Random long value is: 39171

Example 2

import java.util.concurrent.ThreadLocalRandom;

public class ThreadLocalRandomNextLongExample5 {
    public static void main(String[] args) {

        // Returns a pseudorandom, uniformly distributed long value between 26000 and 60000
        System.out.println("Random long value is: " + ThreadLocalRandom.current().nextLong(26000, 60000));
    }
}

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Output:

Random long value is: 42248

Example 3

import java.util.concurrent.ThreadLocalRandom;

public class ThreadLocalRandomNextLongExample6 {
    public static void main(String[] args) {

        // Returns exception because the bound is negative 
        System.out.println("Random long value is: " + ThreadLocalRandom.current().nextLong(-10000));
    }
}

Test it Now

Output:

Exception in thread "main" java.lang.IllegalArgumentException: bound must be positive
	at java.base/java.util.concurrent.ThreadLocalRandom.nextLong(Unknown Source)
	at tests.JavaNextLongExample2.main(ThreadLocalRandomNextLongExample3.java:7)

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