checked exceptions详解
checked exceptions详解
qq52378628 发表于12个月前
checked exceptions详解
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Thread. sleep()是否会抛出checked exception?

 

下面为Thead类sleep()的方法的源码

    /** * Causes the currently executing thread to sleep (temporarily cease * execution) for the specified number of milliseconds, subject to * the precision and accuracy of system timers and schedulers. The thread * does not lose ownership of any monitors. * * @param millis * the length of time to sleep in milliseconds * * @throws IllegalArgumentException * if the value of {@code millis} is negative * * @throws InterruptedException * if any thread has interrupted the current thread. The * <i>interrupted status</i> of the current thread is * cleared when this exception is thrown. */
    public static native void sleep(long millis) throws InterruptedException;

 

 

可以看到sleep()方法会抛出InterruptedException,而根据checked exception的定义,所有Exception的子类,只要不是RuntimeException都是checked exception。

下面是InterruptedException的源码:

package java.lang;

/**
 * Thrown when a thread is waiting, sleeping, or otherwise occupied,
 * and the thread is interrupted, either before or during the activity.
 * Occasionally a method may wish to test whether the current
 * thread has been interrupted, and if so, to immediately throw
 * this exception.  The following code can be used to achieve
 * this effect:
 * <pre>
 *  if (Thread.interrupted())  // Clears interrupted status!
 *      throw new InterruptedException();
 * </pre>
 *
 * @author  Frank Yellin
 * @see     java.lang.Object#wait()
 * @see     java.lang.Object#wait(long)
 * @see     java.lang.Object#wait(long, int)
 * @see     java.lang.Thread#sleep(long)
 * @see     java.lang.Thread#interrupt()
 * @see     java.lang.Thread#interrupted()
 * @since   JDK1.0
 */
public
class InterruptedException extends Exception {
    private static final long serialVersionUID = 6700697376100628473L;

    /**
     * Constructs an <code>InterruptedException</code> with no detail  message.
     */
    public InterruptedException() {
        super();
    }

    /**
     * Constructs an <code>InterruptedException</code> with the
     * specified detail message.
     *
     * @param   s   the detail message.
     */
    public InterruptedException(String s) {
        super(s);
    }
}

可见InterruptedException会抛出checked exception

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