Random class in java

Random class:

• It is belongs to util package.
• It is used to work with System generated random integer values

nextInt():

• Non static method belongs to Random class.
• Random values will be generated in integer limits.
• Random value can be either positive or negative

Generate random value:

import java.util.Random;
class RandomNumbers 
{
	public static void main(String[] args) 
	{
		Random rand = new Random();
		int val = rand.nextInt();
		System.out.println("Random value is : " + val);
	}
}

Display multiple random values:

import java.util.Random;
class RandomNumbers 
{
	public static void main(String[] args) 
	{
		Random rand = new Random();
		for(int i=1 ; i<=10 ; i++)
		{
			int val = rand.nextInt();
			System.out.println(val);
		}
	}
}

Mod(%) operator returns the remainder when we divide with any value

Program Generate Positive or Negative values from 0 to 50:

import java.util.Random;
class RandomNumbers 
{
	public static void main(String[] args) 
	{
		Random rand = new Random();
		for(int i=1 ; i<=10 ; i++)
		{
			int val = rand.nextInt();
			System.out.println(val%50);
		}
	}
}

nextInt(int upperBound): Generate random values between 0 and specified bound

import java.util.Random;
class RandomNumbers 
{
	public static void main(String[] args) 
	{
		Random rand = new Random();
		for(int i=1 ; i<=10 ; i++)
		{
			int val = rand.nextInt(50);
			System.out.println(val);
		}
	}
}

Generate 20 random numbers of 2 digits:

import java.util.Random;
class RandomNumbers 
{
	public static void main(String[] args) 
	{
		Random rand = new Random();
		int count=0;
		while(count<20)
		{
			int val = rand.nextInt(100);
			if(val>9){
				System.out.println(val);
				++count;
			}
		}
	}
}