Java Random.setSeed() – Examples
In this tutorial, we will learn about the Java Random.setSeed() method, and learn how to use this method to set seed for the Random class object, with the help of examples.
setSeed(seed)
Random.setSeed() method sets the seed of this random number generator using a single long seed.
Syntax
The syntax of setSeed() method is
Random.setSeed(long seed)
where
| Parameter | Description |
|---|---|
| seed | The initial seed for the Random number generator. |
Returns
The method returns void.
Example 1 – setSeed(seed)
In this example, we will create a Random class object and set the seed for this Random object.
Java Program
import java.util.Random;
public class Example {
public static void main(String[] args) {
Random random = new Random();
long seed = 20;
random.setSeed(seed);
System.out.println("The seed is set for the random object.");
System.out.println("Next Random Int : "+random.nextInt());
}
} Output
The seed is set for the random object. Next Random Int : -1150867590
Example 2 – setSeed(seed) – Multiple Runs
In this example, we will see how setting a seed to Random class object effects the generation of random numbers. We will print next random integers using nextInt() method. For a given seed, the sequence of random numbers generated, for each run will remain same.
Java Program
import java.util.Random;
public class Example {
public static void main(String[] args) {
Random random = new Random();
long seed = 20;
random.setSeed(seed);
for(int i = 0; i < 10; i++) {
System.out.println(random.nextInt());
}
}
} Run #1
-1150867590 -1704868423 884779003 -29161773 -885414485 -1791719506 700408466 -1654940986 665796387 -1584522320
Run #2
-1150867590 -1704868423 884779003 -29161773 -885414485 -1791719506 700408466 -1654940986 665796387 -1584522320
Conclusion
In this Java Tutorial, we have learnt the syntax of Java Random.setSeed() function, and also learnt how to use this function with the help of examples.