單項(xiàng)選擇題

What can cause a thread to become non-runnable？（）

A. Exiting from a synchronized block.
B. Calling the wait method on an object.
C. Calling the notify method on an object.
D. Calling the notifyAll method on an object.

你可能感興趣的試題

單項(xiàng)選擇題

public class A extends Thread {
A（） {
setDaemon（true）；
}
public void run（） {
（new B（））.start（）；
try {
Thread.sleep（60000）；
} catch （InterruptedException x） {}
System.out.println（“A done”）；
}
class B extends Thread {
public void run（） {
try {
Thread.sleep（60000）；
} catch （InterruptedException x） {}
System.out.println（“B done”）；
}
}
public static void main（String[] args） {
（new A（））.start（）；
}
}
What is the result？（）

A. A done
B. B done
C. A done B done
D. B done A done
E. There is no exception that the application will print anything.
F. The application outputs “A done” and “B done”， in no guaranteed order.

單項(xiàng)選擇題

public class X implements Runnable {
private int x；
private int y；
public static void main（String [] args） {
X that = new X（）；
（new Thread（ that ））.start（）；
（new Thread（ that ））.start（）；
}
public void run（） {
for （；；） {
synchronized （this） {
x++；
y++；
}
System.out.println（Thread.currentThread（）.getName（） +
“x = “ + x + “， y = “ + y）；
}
}
}
What is the result？（）

A. Compilation fails.
B. The program prints pairs of values for x and y that might not always be the same on the same line （for example， “x = 2， y = 1”）.
C. The program prints pairs of values for x and y that are always the same on the same line （for example， “x = 1， y = 1”）. In addition， each value appears only once （for example， “x = 1， y = 1” followed by “x = 2， y = 2”）. The thread name at the start of the line shows that both threads are executing concurrently.
D. The program prints pairs of values for x and y that are always the same on the same line （for example， “x = 1， y = 1”）. In addition， each value appears only once （for example， “x = 1， y = 1” followed by “x = 2， y = 2”）. The thread name at the start of the line shows that only a single thread is actually executing.

What can cause a thread to become non-runnable？（）

你可能感興趣的試題

What can cause a thread to become non-runnable？（）