Method stop

guava/src/com/google/common/base/Stopwatch.java:178–185

Stops the stopwatch. Future reads will return the fixed duration that had elapsed up to this point. @return this {@code Stopwatch} instance @throws IllegalStateException if the stopwatch is already stopped.

()

   * @throws IllegalStateException if the stopwatch is already stopped.
   */
  @CanIgnoreReturnValue
  public Stopwatch stop() {
    long tick = ticker.read();
    checkState(isRunning, "This stopwatch is already stopped.");
    isRunning = false;
    elapsedNanos += tick - startTick;
    return this;
  }

  /**
   * Sets the elapsed time for this stopwatch to zero, and places it in a stopped state.