Java Interrupts - Who or What clears interrupted flag and How ?

Main.java

/**
 * Created by rozaydin on 2/15/17.
 */
public class Main {

    public static void main(String[] args) {

        try {

            t1 t1 = new t1();
            t1.start();

            Thread.sleep(10);
            t1.interrupt();
            System.out.println("t1.isInterrupted: " + t1.isInterrupted() + " t1.state: " + t1.getState());
            Thread.sleep(20);
            System.out.println("t1.isInterrupted: " + t1.isInterrupted() + " t1.state: " + t1.getState());

        } catch (Exception exc) {
            System.out.println("Exeption: " + exc);
        }

    }
}

output.txt

...
Processing
Processing
Processing
t1.isInterrupted: true t1.state: RUNNABLE
Execution completed - interrupt status: true
t1.isInterrupted: false t1.state: TERMINATED

t1.java

/**
 * Created by rozaydin on 2/15/17.
 */
public class t1 extends Thread {

    @Override
    public void run() {

        while (!Thread.currentThread().isInterrupted()) {
            System.out.println("Processing");
        }

        System.out.println("Execution completed - interrupt status: " + Thread.currentThread().isInterrupted());
    }
}