JuniorTheoryCommon

What does the program print?

JAVA

public class Main {
    public static void main(String[] args) {
        Thread t = new Thread(() -> {
            String name = Thread.currentThread().getName();
            System.out.println(name);
        }, "cook");
        t.run();
    }
}

main

Expecting cook: run() does not start a thread, so the task runs in main, and Thread.currentThread() returns the main thread.
Expecting nothing because the thread was never started: run() is an ordinary call, so the task runs at once in the calling thread.

What would the program print if t.run() were replaced with t.start()?
What happens if you call start() on the same thread twice?

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Back to questions

JuniorTheoryCommon

What does the program print?

JAVA

public class Main {
    public static void main(String[] args) {
        Thread t = new Thread(() -> {
            String name = Thread.currentThread().getName();
            System.out.println(name);
        }, "cook");
        t.run();
    }
}

main

Expecting cook: run() does not start a thread, so the task runs in main, and Thread.currentThread() returns the main thread.
Expecting nothing because the thread was never started: run() is an ordinary call, so the task runs at once in the calling thread.

What would the program print if t.run() were replaced with t.start()?
What happens if you call start() on the same thread twice?

Back to questions Open topic in roadmap →Answer it yourself — Quiz