Пример

public class ClassA {
private boolean b;
private Thread t;
public classA () {
//...
}
public void methodA () {
//...
b = Thread.interrupted();
}

}
Исправление
Замените 'Thread.interrupted()' на 't.interrupted()'

public class ClassA {
private boolean b;
private Thread t;
public classA () {
//...
}
public void methodA () {
//...
b = Tt.interrupted();
}

}