Java Random.longs() – Syntax & Examples

Java Random.longs() – Examples

In this tutorial, we will learn about the Java Random.longs() method, and learn how to use this method to generate a stream of long type numbers, with the help of examples.

longs()

Random.longs() returns an effectively unlimited stream of pseudorandom long values.

Syntax

The syntax of longs() method is

Random.longs()

Returns

The method returns LongStream object.

Example 1 – longs()

In this example, we will generate an unlimited sequence of random long type numbers using longs() method and print out four of them to the console.

Java Program

import java.util.Random;
import java.util.function.LongConsumer;
import java.util.stream.LongStream;  

public class Example {  
	public static void main(String[] args) {  
		Random random = new Random();  
		LongStream ds = random.longs();  

		ds.limit(4).forEach(new LongConsumer() {
			@Override
			public void accept(long value) {
				System.out.println(value);
			}
		});
	}  
}

Output

-6251239855392854015
-7974780473092051021
-2652163404078734145
7738474359912325515

longs(long streamSize)

Random.longs() returns a stream producing the given streamSize number of pseudorandom long values.

Syntax

The syntax of longs() method with stream size is

Random.longs(long streamSize)

where

Parameter	Description
streamSize	The number of values to generate in the stream.

Returns

The method returns LongStream object.

Example 2 – longs(streamSize)

In this example, we will generate an specific number of long values, say eight, using longs(streamSize) method and print out these random numbers from the stream to the console.

Java Program

import java.util.Random;
import java.util.function.LongConsumer;
import java.util.stream.LongStream;  

public class Example {  
	public static void main(String[] args) {  
		long streamSize = 8;
		Random random = new Random();  
		LongStream ds = random.longs(streamSize);  

		ds.forEach(new LongConsumer() {
			@Override
			public void accept(long value) {
				System.out.println(value);
			}
		});
	}  
}

Output

-6830441378515779608
-1179248027058137291
-5606058920192108368
8178120771225726595
-3472126381625498085
7782182188885249485
-4504231265999262239
-4107022727140179889

longs(long randomNumberOrigin, long randomNumberBound)

Random.longs() returns an effectively unlimited stream of pseudorandom long values, each conforming to the given origin (inclusive) and bound (exclusive).

Syntax

The syntax of longs() method with random number origin and random number bound is

Random.longs(long randomNumberOrigin, long randomNumberBound)

where

Parameter	Description
randomNumberOrigin	The origin (inclusive) of each random value.
randomNumberBound	The bound (exclusive) of each random value.

Returns

The method returns LongStream object.

Example 3 – longs(randomNumberOrigin, randomNumberBound)

In this example, we will generate an unlimited sequence of random long values, which are limited by an origin and bound using longs() method and print out four of these numbers from the stream to the console.

Java Program

import java.util.Random;
import java.util.function.LongConsumer;
import java.util.stream.LongStream;  

public class Example {  
	public static void main(String[] args) {  
		long randomNumberOrigin = 154;  
		long randomNumberBound = 200;  
		Random random = new Random();  
		LongStream ds = random.longs(randomNumberOrigin, randomNumberBound);  

		ds.limit(4).forEach(new LongConsumer() {
			@Override
			public void accept(long value) {
				System.out.println(value);
			}
		});
	}  
}

Output

188
174
194
188

longs(long streamSize, long randomNumberOrigin, long randomNumberBound)

Random.longs() returns a stream producing the given streamSize number of pseudorandom long, each conforming to the given origin (inclusive) and bound (exclusive).

Syntax

The syntax of longs() method with stream size, random number origin and random number bound is

Random.longs(long streamSize, long randomNumberOrigin, long randomNumberBound)

where

Parameter	Description
streamSize	The number of values to generate in the Stream.
randomNumberOrigin	The origin (inclusive) of each random value in the Stream.
randomNumberBound	The bound (exclusive) of each random value in the Stream.

Returns

The method returns LongStream object.

Example 4 – longs( streamSize, randomNumberOrigin, randomNumberBound)

In this example, we will generate eight random numbers of type long which are limited by an origin and bound using longs() method and print out these random numbers from the stream to the console.

Java Program

import java.util.Random;
import java.util.function.LongConsumer;
import java.util.stream.LongStream;  

public class Example {  
	public static void main(String[] args) {  
		long streamSize = 8;
		long randomNumberOrigin = 154;  
		long randomNumberBound = 200;  
		Random random = new Random();  
		LongStream ds = random.longs(streamSize, randomNumberOrigin, randomNumberBound);

		ds.forEach(new LongConsumer() {
			@Override
			public void accept(long value) {
				System.out.println(value);
			}
		});
	}  
}

Output

192
172
155
170
179
157
188
197

Conclusion

In this Java Tutorial, we have learnt the syntax of Java Random.longs() method, and also learnt how to use this method with the help of examples.