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Java example source code file (Stopwatch.java)

This example Java source code file (Stopwatch.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

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Java - Java tags/keywords

log, logger, logging, stopwatch

The Stopwatch.java Java example source code

 * Copyright (C) 2006 Google Inc.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.

package com.google.inject.internal.util;

import java.util.logging.Logger;

 * Enables simple performance monitoring.
 * @author crazybob@google.com (Bob Lee)
public final class Stopwatch {
  private static final Logger logger = Logger.getLogger(Stopwatch.class.getName());

  private long start = System.currentTimeMillis();

   * Resets and returns elapsed time in milliseconds.
  public long reset() {
    long now = System.currentTimeMillis();
    try {
      return now - start;
    } finally {
      start = now;

   * Resets and logs elapsed time in milliseconds.
  public void resetAndLog(String label) {
    logger.fine(label + ": " + reset() + "ms");

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