Thread sleep
In this chapter you will learn:
Sleep a thread
The sleep() method causes the thread to suspend execution
for the specified period of milliseconds.
Its general form is shown here:
static void sleep(long milliseconds) throws InterruptedException
The number of milliseconds to suspend is specified in milliseconds. This method may throw an InterruptedException.
The sleep() method has a second form,
shown next, which allows you to specify the
period in terms of milliseconds and nanoseconds:
static void sleep(long milliseconds, int nanoseconds) throws InterruptedException
The following code makes the thread wait for one second.
Thread.sleep(1000); // Delay for 1 second
public class Main {
public static void main(String[] argv) throws Exception {
long numMillisecondsToSleep = 5000;
Thread.sleep(numMillisecondsToSleep);
}/*ja v a 2 s . c o m*/
}
Pause the execution
The following class defines utility methods to stop the thread for a second or number of seconds.
We can use those methods when we want to stop the execution of current thread.
class Wait {//from ja v a 2 s .c om
public static void oneSec() {
try {
Thread.currentThread().sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
public static void manySec(long s) {
try {
Thread.currentThread().sleep(s * 1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
public class Main{
public static void main(String args[]) {
Wait.oneSec();
Wait.manySec(5);
}
}
Add a delay
It illustrates the sleep method we can put the sleep method in a for loop and wait for one second for each loop.
public class Main {
public static void main(String[] args) {
for (int i = 0; i < 10; i++) {
System.out.println("i = " + i);
/*from j ava2 s . c o m*/
try {
Thread.sleep(1000);
} catch (InterruptedException ie) {
ie.printStackTrace();
}
}
}
}
Next chapter...
What you will learn in the next chapter: