Question

Solve the following using java

Write a program that runs three threads, each thread randomizes a number between 1 and 100. The main thread waits for all the others to finish, calculates the maximum of the numbers, which were randomized, and prints it.

Random number 1: 10

Random number 2: 38

Random number 3: 81

Max: 81

Note: You should create 3 threads in adition to the main thread. Also, you can use a single thread class and create 3 instances from it in the main class.

Answer 1

If you have any problem with the code feel free to comment.

Program

//custom Random class for generating random number between 1 and 100;
class Random {
   int num;

   public void randomize() {
       num = (int) (Math.random() * 100 + 1);
   }
}

public class Test {
   public static void main(String[] args) throws InterruptedException {
       int num1, num2, num3;

       // object of random
       Random obj = new Random();

       // creating 3 threads
       // each thread calling randomize()
       Thread th1 = new Thread(() -> {
           obj.randomize();
       });

       Thread th2 = new Thread(() -> {
           obj.randomize();
       });
       Thread th3 = new Thread(() -> {
           obj.randomize();
       });

       // starting and waiting for each thread to finish
       // then assigning the value to num's
       th1.start();
       th1.join();
       num1 = obj.num;

       th2.start();
       th2.join();
       num2 = obj.num;

       th3.start();
       th3.join();
       num3 = obj.num;

       // printing each thread result
       System.out.println("Random Number 1: " + num1);
       System.out.println("Random Number 2: " + num2);
       System.out.println("Random Number 3: " + num3);

       // fidning maximum number
       int max = (num1 > num2 && num1 > num3) ? num1 : (num2 > num1 && num2 > num3) ? num2 : num3;

       // printing maximum number
       System.out.println("Max: " + max);

   }
}

Output