java random number

1import java.util.Random;
2
3Random rand = new Random();
4
5// Obtain a number between [0 - 49].
6int n = rand.nextInt(50);
7
8// Add 1 to the result to get a number from the required range
9// (i.e., [1 - 50]).
10n += 1;

1import java.util.Random;
2
3Random rand = new Random();
4int maxNumber = 10;
5
6int randomNumber = rand.nextInt(maxNumber) + 1;
7
8System.out.println(randomNumber);

1import java.util.Random;
2
3class scratch{
4    public static void main(String[] args) {
5        Random rand = new Random();
6        System.out.println( rand.nextInt(5) );
7        //prints a random Int between 0 - 4 (including 0 & 4);
8    }
9}

1import java.lang.Math;
2
3int randomNumber;
4
5int minimum = 1;
6int maximum = 10 - minimum;
7
8randomNumber = (int)((Math.random()*maximum) + minimum);
9
10System.out.println("Random Number (Between 1-10): " + randomNumber);

1// java.util.random example
2import java.util.Random;
3public class JavaRandomClass
4{
5   public static void main(String[] args)
6   {
7      Random random = new Random();
8      // random integers in range 0 to 999 
9      int randInt1 = random.nextInt(1000); 
10      int randInt2 = random.nextInt(1000);
11      // printing random integers
12      System.out.println("Random Integers: " + randInt1); 
13      System.out.println("Random Integers: " + randInt2);
14      // here we are generating Random doubles
15      double randDou1 = random.nextDouble(); 
16      double randDou2 = random.nextDouble();
17      // printing random doubles
18      System.out.println("Random Doubles: " + randDou1); 
19      System.out.println("Random Doubles: " + randDou2);
20   }
21}

1// Thread safe random number generator.
2
3import java.util.concurrent.ThreadLocalRandom;
4
5
6
7// Generate random integers  
8int val = ThreadLocalRandom.current().nextInt();  
9
10// Print random int
11System.out.println("Random Integer: " + val); 
12