Run vs start in threads in java What are Yasser Ibrahim @Jobilize

Author: Yasser Ibrahim

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Question 223 / 297: What are the possible results of compiling and running the following code?
Choose 2

public class Test implements Runnable {

	int id;

	Test(int id) {
		this.id = id;
	}

	public static void main(String[] args) throws InterruptedException {
		Thread thread1 = new Thread(new Test(1));
		Thread thread2 = new Thread(new Test(2));
		thread1.run();
		thread2.start();
		System.out.print("main");
	}

	public void run() {
		System.out.print(id);
	}

}

12main

21main

2main1

1main2

compilation error, cannot invoke run() directly on thread1

compilation error, cannot invoke start() directly on thread2

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Explanation:

Invoking run() on a thread doesn't cause a new thread of execution to start with a new call stack, invoking method start() does that. Therefore line thread1.run() will always execute and complete executing before thread2.start()

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