What is StopWatch in java?
Create a stopwatch using Java programming. We’ll build a basic stopwatch that starts, stops, and resets, allowing you to track time conveniently. This stopwatch provides a seamless experience, enabling you to initiate time measurement as needed and halt it with a simple stop command.
What is approach to implement StopWatch ?
- Handle user commands using Scanner.
- Start
- Stop
- Exit
- Capture start time.
- Calculate elapsed time.
- Ensure clear prompts for user interaction.
- Display the time to console
Program: Implement Stopwatch in java
import java.util.Scanner; public class SimpleStopwatch { private long startTime; private boolean isRunning; public void start() { if (!isRunning) { startTime = System.currentTimeMillis(); isRunning = true; System.out.println("Stopwatch started."); } else { System.out.println("Stopwatch is already running."); } } public void stop() { if (isRunning) { long endTime = System.currentTimeMillis(); long elapsedTime = endTime - startTime; isRunning = false; System.out.println("Stopwatch stopped. Elapsed time: " + formatTime(elapsedTime)); } else { System.out.println("Stopwatch is not running."); } } private String formatTime(long milliseconds) { long seconds = milliseconds / 1000; long minutes = seconds / 60; long hours = minutes / 60; seconds %= 60; minutes %= 60; return String.format("%02d:%02d:%02d", hours, minutes, seconds); } public static void main(String[] args) { Scanner scanner = new Scanner(System.in); SimpleStopwatch stopwatch = new SimpleStopwatch(); boolean isAppRunning = true; while (isAppRunning) { System.out.println("Enter 'start' to begin, 'stop' to end, or 'exit' to stop the application:"); String input = scanner.nextLine(); switch (input.toLowerCase()) { case "start": stopwatch.start(); break; case "stop": stopwatch.stop(); break; case "exit": isAppRunning = false; break; default: System.out.println("Invalid input. Please enter 'start', 'stop', or 'exit'."); break; } } scanner.close(); } }
Output: Simple stopwatch in java
Enter 'start' to begin, 'stop' to end, or 'exit' to stop the application: start Stopwatch started. Enter 'start' to begin, 'stop' to end, or 'exit' to stop the application: stop Stopwatch stopped. Elapsed time: 00:00:50