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Output question 7.
Java Interview Questions and Answers (part 4)
(Continued from previous question...)
67. Output question 7.
class MyRunnable implements Runnable {
public void run() {
System.out.println(Thread.currentThread().getName() + " has started");
try {
Thread.sleep(100); //ensure that main thread don’t complete before Thread-1
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println(Thread.currentThread().getName() + " has ended");
}
}
public class MyClass {
public static void main(String... args) throws InterruptedException {
System.out.println(Thread.currentThread().getName() + " has started");
Thread thread1 = new Thread(new MyRunnable(), "Thread-1");
thread1.start();
thread1.sleep(10000);
System.out.println(Thread.currentThread().getName() + " has ended");
}
}
/*OUTPUT
main has started
Thread-1 has started
Thread-1 has ended
main has ended
*/
Answer.
sleep() is a static method, causes the currently executing thread to sleep for the specified number of milliseconds.
Calling thread1.sleep(10000); will show warning - The static method sleep(long) from the type Thread should be accessed in a static way.
In the program first main thread started, than it invoked Thread-1, then Thread-1 called sleep(100) method to ensure that main thread don’t complete before Thread-1, than execution control went to main thread and it called thread1.sleep(10000) but rather than putting Thread-1 on sleep it made main thread to sleep. And Thread-1 ended before main thread.
(Continued on next question...)
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