How can I retrieve values computed in a thread from the main method?

Passing Values from Threads

When working with threads, one may encounter the need to retrieve values computed within the thread from the main method. This can present a challenge, as threads don't inherently have a mechanism for returning values. However, there are strategies to overcome this limitation.

One approach involves utilizing a customized thread class that includes a method to access the computed value:

<code class="java">public class Foo implements Runnable {
    private volatile int value;

    @Override
    public void run() {
        value = 2; // Compute the value in the thread
    }

    public int getValue() {
        return value;
    }
}</code>

The main method can then utilize this custom thread as follows:

<code class="java">Foo foo = new Foo();
Thread thread = new Thread(foo);
thread.start();
thread.join();
int value = foo.getValue(); // Retrieve the value computed in the thread</code>

By referencing the thread like an ordinary class, the main method gains access to the computed value.

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