Random Number Generation with Java

Using the Random Class

generate a random number is to use the Java Random class of the java.util package. It generates a stream of pseudorandom numbers. We can generate a random number of any data type, such as integer, float, double, Boolean, long. If you are going to use this class to generate random numbers, follow the steps given below:

First, import the class java.lang.Random.
Create an object of the Random class. Why (TBD)
Invoke any of the following methods:
nextInt()
nextFloat()
nextDouble()
nextLong()
nextBoolean()

Example: Using Java Random Class

First, we will see the implementation using java.util.Random – Assume we need to generate 10 digit random number in Java between 0 to 100.

import java.util.Random;
public class RandomNumbers{
        public static void main(String[] args) {
        	Random objGenerator = new Random();
            for (int iCount = 0; iCount< 10; iCount++){
              int randomNumber = objGenerator.nextInt(100);
              System.out.println("Random No : " + randomNumber); 
             }
     }
}


Output:

Random No : 17
Random No : 57
Random No : 73
Random No : 48
Random No : 68
Random No : 86
Random No : 34
Random No : 97
Random No : 73            
Random No : 18

program-2

import java.util.Random;

class AtRandomNumber
{
    public static void main(String[] args) 
    {
      Random random = new Random();
int rand = 0;
while (true){
    rand = random.nextInt(11);
    if(rand !=0) 
    break;
}
System.out.println(rand);
    }
}
output 
6

The now() method of LocalDate class

The now() method of the Localdate class returns the Date object representing the current time.

import java.time.LocalDate;
public class CreateDate {
   public static void main(String args[]) {  
      LocalDate date = LocalDate.now();
      System.out.println("Current Date: "+date);
   }
}
Output

Current Date: 2020-11-08

reference:

https://www.tutorialspoint.com/how-to-get-the-current-date-in-java

https://www.w3schools.in/java/examples/generate-random-numbers

https://www.tutorialspoint.com/using-predefined-class-name-as-class-or-variable-name-in-java

Learn Java