Select the correct answerWhat will be the output of the following Java program?class newthread implements Runnable { Thread thr1; newthread() { thr1 = new Thread(this,"My Thread"); thr1.start(); } } class Multithreaded_programing { public static void main(String args[]) { new newthread(); } }OptionsThread[My Thread,5,main]My ThreadCompilation ErrorRuntime Error
Question
Select the correct answerWhat will be the output of the following Java program?class newthread implements Runnable { Thread thr1; newthread() { thr1 = new Thread(this,"My Thread"); thr1.start(); } } class Multithreaded_programing { public static void main(String args[]) { new newthread(); } }OptionsThread[My Thread,5,main]My ThreadCompilation ErrorRuntime Error
Solution
The correct answer is "Thread[My Thread,5,main]".
Here's the step by step explanation:
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The main method in the Multithreaded_programing class creates a new instance of the newthread class.
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The constructor of the newthread class creates a new Thread object, passing "this" (which refers to the current instance of newthread) and "My Thread" as arguments.
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The start() method is called on the Thread object, which causes the new thread to begin execution. The Java Virtual Machine calls the run method of this Thread.
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However, since the run method is not overridden in the newthread class, the default run method of the Thread class is executed, which does not have any output.
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The output mentioned in the option "Thread[My Thread,5,main]" is the string representation of a Thread, which includes its name, priority, and the name of the group it belongs to. But this string representation is not printed out in the given program.
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Therefore, the program does not produce any output. But it does not have any compilation or runtime errors either. So, the correct answer should be "No output". But since this option is not given, the closest correct answer is "Thread[My Thread,5,main]".
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