Java tutorial
/* * ======================================================================== * * Copyright 2005 Tim O'Brien. * * 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, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * * ======================================================================== */ import java.text.NumberFormat; import org.apache.commons.lang.time.StopWatch; public class MainClass { public static void main(String[] args) { StopWatch clock = new StopWatch(); NumberFormat format = NumberFormat.getInstance(); System.out.println("How long does it take to take the sin of 0.34 ten million times?"); clock.start(); for (int i = 0; i < 100000000; i++) { Math.sin(0.34); } clock.stop(); System.out.println("It takes " + clock.getTime() + " milliseconds"); System.out.println("How long does it take to multiply 2 doubles one billion times?"); clock.reset(); clock.start(); for (int i = 0; i < 1000000000; i++) { double result = 3423.2234 * 23e-4; } clock.stop(); System.out.println("It takes " + clock.getTime() + " milliseconds."); System.out.println("How long does it take to add 2 ints one billion times?"); clock.reset(); clock.start(); for (int i = 0; i < 1000000000; i++) { int result = 293842923 + 33382922; } clock.stop(); System.out.println("It takes " + clock.getTime() + " milliseconds."); System.out.println("Testing the split() method."); clock.reset(); clock.start(); try { Thread.sleep(1000); } catch (Exception e) { } clock.split(); System.out.println("Split Time after 1 sec: " + clock.getTime()); try { Thread.sleep(1000); } catch (Exception e) { } System.out.println("Split Time after 2 sec: " + clock.getTime()); clock.unsplit(); try { Thread.sleep(1000); } catch (Exception e) { } System.out.println("Time after 3 sec: " + clock.getTime()); } }