Java Random.nextInt() – Syntax & Examples

Java Random.nextInt() – Examples

In this tutorial, we will learn about the Java Random.nextInt() method, and learn how to use this method to generate a random integer value, with the help of examples.

nextInt()

Random.nextInt() returns the next pseudorandom, uniformly distributed int value from this random number generator’s sequence.

Syntax

The syntax of nextInt() method is

Random.nextInt()

Returns

The method returns int value.

Example 1 – nextInt()

In this example, we will create an object random of Random class type. We will call nextInt() on this Random object to get the next integer value. We shall print it to console.

Java Program

import java.util.Random;

public class Example{ 
    public static void main(String[] args) {
    	Random random = new Random();
    	int i = random.nextInt();
    	System.out.println("Next random integer value is : " + i);
    }
}

Output

Next random integer value is : 759359738

Output may vary, since the integer value is generated randomly.

Example 2 – nextInt()

In this example, we will generate random integers in a for loop using nextInt().

Java Program

import java.util.Random;

public class Example{ 
    public static void main(String[] args) {
    	Random random = new Random();
    	for (int i=0; i < 10; i++) {
    		System.out.println(random.nextInt());
    	}
    }
}

Output

-1606630265
-125238934
1699538591
602193890
-1853930796
-1411396788
358058549
-1257625834
-1537171335
-277970796

nextInt(int bound)

Random.nextInt() Returns a pseudorandom, uniformly distributed int value between 0 (inclusive) and the specified value (exclusive), drawn from this random number generator’s sequence.

Syntax

The syntax of nextInt() method with bound specified is

Random.nextInt(int bound)

where

Parameter	Description
bound	The upper bound on the random value to be generated.

Returns

The method returns int value.

Example 3 – nextInt(int bound)

In this example, we will create an object random of Random class type. We will call nextInt(bound) on this Random object to get the next integer value within the number, bound. We shall print it to console.

Java Program

import java.util.Random;

public class Example{ 
    public static void main(String[] args) {
    	Random random = new Random();
    	int bound = 100;
    	int i = random.nextInt(bound);
    	System.out.println("Next random integer value is : " + i);
    }
}

Output

Next random integer value is : 53

Output may vary, since the integer value is generated randomly.

Example 4 – nextInt(int bound)

In this example, we will generate random integers within the given bound value, in a for loop using nextInt().

Java Program

import java.util.Random;

public class Example{ 
    public static void main(String[] args) {
    	Random random = new Random();
    	int bound = 10;
    	for (int i=0; i < 10; i++) {
    		System.out.println(random.nextInt(bound));
    	}
    }
}

Output

3
0
6
4
6
1
0
9
3
8

Output may vary, since the integer value is generated randomly.

Conclusion

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