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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallThread.sleep() pauses the thread that calls it for at least the requested interval, subject to the operating system’s timer and scheduler. It does not pause every thread, release a monitor, or make shared data safe to access. Here is how to call it, handle interruption, and avoid common timing and synchronization mistakes.
What Thread.sleep() does
Thread.sleep() is a static method on java.lang.Thread. It suspends the currently executing thread for a requested time. Other threads in the application can continue running.
The requested duration is not an exact wake-up guarantee: timer precision and scheduling affect when the thread resumes, and it may resume later than requested. Use sleep for simple pauses or pacing, not for meeting precise deadlines or reliably waiting for another thread’s condition.
Syntax and Java version support
The Java SE 26 API documents these overloads:
Thread.sleep(long millis)Thread.sleep(long millis, int nanos)Thread.sleep(Duration duration)
Each can throw InterruptedException. The Duration overload has been available since Java 19. For Java versions before 19, use one of the numeric overloads. See Oracle’s Thread API documentation for Java SE 26.
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Millisecond overload
Pass a nonnegative number of milliseconds:
Thread.sleep(1_000); // request a one-second pauseMillisecond-and-nanosecond overload
The second argument adds nanoseconds to the millisecond value. It must be between 0 and 999999, inclusive; the millisecond value must be nonnegative. Invalid numeric arguments cause IllegalArgumentException.
Thread.sleep(250, 500_000); // request 250 milliseconds plus 500,000 nanosecondsDuration overload (Java 19 and later)
Pass a java.time.Duration:
import java.time.Duration;
Thread.sleep(Duration.ofMillis(250));The API documents a negative Duration as a no-op. Numeric overloads instead reject negative millisecond values.
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Example: pause between actions
This complete program prints three steps, requesting a one-second pause after each. If sleep is interrupted, it restores the interrupt status and exits rather than silently carrying on.
public class SleepExample {
public static void main(String[] args) {
try {
for (int i = 1; i <= 3; i++) {
System.out.println("Step " + i);
Thread.sleep(1_000);
}
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
return;
}
}
}Save as SleepExample.java, compile with javac SleepExample.java, and run with java SleepExample. The pause is approximate; it is not a promise that each line appears exactly one second apart.
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Handle InterruptedException deliberately
Interruption is a cooperative request to stop or cancel work. If a thread is interrupted while sleeping, sleep throws InterruptedException and clears that thread’s interrupted status.
- If the method can pass the cancellation signal to its caller, declare
throws InterruptedExceptionand let the caller decide what to do. - If the method handles the exception locally and cannot propagate it, call
Thread.currentThread().interrupt()before returning or proceeding with cancellation handling. - Do not catch the exception and ignore it as if nothing happened; that discards the cancellation request.
Does Thread.sleep() release a lock?
No. A sleeping thread does not lose ownership of monitors it holds. If it calls Thread.sleep() inside a synchronized block, another thread that needs the same monitor remains blocked until the sleeping thread leaves that block.
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Avoid sleeping while holding a monitor needed by other threads; doing so can prevent them from making progress. Oracle states in its Java SE 26 Thread API that the thread “does not lose ownership of any monitors.”
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Sleep does not provide synchronization or visibility
Calling sleep does not establish synchronization or guarantee that a thread sees another thread’s updates. The Java Language Specification says that Thread.sleep and Thread.yield have no synchronization semantics.
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For example, repeatedly checking a shared non-volatile boolean and sleeping between checks does not make the loop safe. Use an appropriate coordination mechanism, such as a volatile field for suitable state, a lock, or a higher-level concurrency utility.
Common mistakes and fixes
- “Sleep for one second” must mean exactly one second: it means a requested interval, not a deadline. Allow for scheduling delay; use deadline-aware logic if timing precision matters.
- Waiting for another thread by polling with sleep: sleep does not tell you when a condition becomes true and can introduce unnecessary latency. Use a condition or coordination mechanism suited to the task.
- Sleeping inside a synchronized block: the monitor remains held. Move the pause outside the critical section where possible.
- Ignoring InterruptedException: interruption cancels the sleep and clears the status. Propagate it or restore the status when handling locally.
- Invalid numeric arguments: negative milliseconds or nanoseconds outside
0–999999causeIllegalArgumentException. Validate numeric values before calling.
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This Java method is not a browser-screenshot task, so ScreenshotNeo is not needed to use Thread.sleep(). If you also need to capture web pages, ScreenshotNeo offers a one-request screenshot API:
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Sources and version note
The overloads and behavior described above follow Oracle’s Java SE 26 Thread API and the Java Language Specification, Java SE 26. Oracle’s sleep tutorial is explicitly for JDK 8; its introductory example remains useful, but it predates the later Duration overload.
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