What will be the output of the below java code using volatile keyword?

Problem statement: Given code is

1. public class Test extends Thread {
2. private volatile int i = 0;
3. public int getData() {
4. return i + 1;
5. }
6. public void run() {}
7. public static void main(String[] args) {
8. Test t1 = new Test();
9. t1.start();
10. System.out.println("First thread: " + t1.getData());
11. Test t2 = new Test();
12. t2.start();
13. System.out.println("Second thread: " + t2.getData());
14. Test t3 = new Test();
15. t3.start();
16. System.out.println("Third thread: " + t3.getData());
17. }
18. }

Output:
First thread: 1
Second thread: 1
Third thread: 1

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what will be the output of thread problem?

Problem statement:
what will be the output of the following code?

1. public class Person extends Thread {
2.     private int count;
3.     private Person(int count) {
4.         this.count = count;
5.     }
6.     @Override
7.     public void run() {
8.         for (int i = 1; i < 4; i++) {
9.             count = count + 1;
10.         }
11.     }
12.     public static void main(String[] args) {
13.         Person t = new Person(10);
14.         t.start();
15.         System.out.println(t.count);
16.     }
17. }

Output: 10

output will vary, will explain the reason soon

what will be the output of thread code?

Problem statement:

what will be the output of the following code?

1. public class ExecutionFourteen extends Thread {
2.     private int count;
3.     private ExecutionFourteen(int count) {
4.         this.count = count;
5.     }
6.     @Override
7.     public void run() {
8.         for (int i = 1; i < 4; i++) {
9.             count = count + 1;
10.             System.out.println("count inside run() method: " + count + ", thread name: " + Thread.currentThread().getName());
11.         }
12.     }
13.     public static void main(String[] args) {
14.         ExecutionFourteen t = new ExecutionFourteen(10);
15.         t.start();
16.         System.out.println("count inside main() method: " + t.count);
17.     }
18. }

Output:

count inside main() method: 10

count inside run() method: 11, thread name: Thread-0

count inside run() method: 12, thread name: Thread-0

count inside run() method: 13, thread name: Thread-0