Java Random.ints() – Syntax & Examples

Java Random.ints() – Examples

In this tutorial, we will learn about the Java Random.ints() method, and learn how to use this method to generate a stream of pseudorandom int values, with the help of examples.

ints()

Random.ints() returns an effectively unlimited stream of pseudorandom int values.

Syntax

The syntax of ints() method is

Random.ints()

Returns

The method returns IntStream object.

Example 1 – ints()

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

Java Program

import java.util.Random;
import java.util.stream.IntStream;
import java.util.function.IntConsumer;

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

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

Output

1549243955
-654704097
-1217687007
1648661790

ints(randomNumberOrigin, randomNumberBound)

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

Syntax

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

Random.ints(int randomNumberOrigin, int randomNumberBound)

where

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

Returns

The method returns IntStream object.

Example 2 – ints(randomNumberOrigin, randomNumberBound)

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

Java Program

import java.util.Random;
import java.util.function.IntConsumer;
import java.util.stream.IntStream;  

public class Example {  
	public static void main(String[] args) {  
		int randomNumberOrigin = 1;  
		int randomNumberBound = 7;  
		Random random= new Random();  
		IntStream ds = random.ints(randomNumberOrigin, randomNumberBound);  

		ds.limit(5).forEach(new IntConsumer() {
			@Override
			public void accept(int value) {
				System.out.println(value);
			}
		});
	}  
}

Output

2
2
1
1
5

ints(long streamSize)

Random.ints() returns a stream producing the given streamSize number of pseudorandom int values.

Syntax

The syntax of ints() method with stream size is

Random.ints(long streamSize)

where

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

Returns

The method returns IntStream object.

Example 3 – ints(streamSize)

In this example, we will generate eight random integers using ints(streamSize) method and print out these random numbers from the stream to the console.

Java Program

import java.util.Random;
import java.util.function.IntConsumer;
import java.util.stream.IntStream;  

public class Example {  
	public static void main(String[] args) {  
		int streamSize = 8;
		Random random = new Random();  
		IntStream ds = random.ints(streamSize);  

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

Output

790793602
-445498747
-322809516
1575745272
732465345
586364815
1791511337
-1366525847

ints(long streamSize, int randomNumberOrigin, int randomNumberBound)

Random.ints() Returns a stream producing the given streamSize number of pseudorandom int values, each conforming to the given origin (inclusive) and bound (exclusive).

Syntax

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

Random.ints(long streamSize, int randomNumberOrigin, int 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 IntStream object.

Example 4 – ints(streamSize, randomNumberOrigin, randomNumberBound)

In this example, we will generate eight random integers which are limited by an origin 1 and bound 7 using ints() method and print out these random numbers from the stream to the console.

Java Program

import java.util.Random;
import java.util.function.IntConsumer;
import java.util.stream.IntStream;  

public class Example {  
	public static void main(String[] args) {  
		int streamSize = 8;
		int randomNumberOrigin = 1;  
		int randomNumberBound = 7;  
		Random random = new Random();  
		IntStream ds = random.ints(streamSize, randomNumberOrigin, randomNumberBound);  

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

Output

4
6
2
5
5
3
3
2

Conclusion

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