secondscalculator.java

ssd3部分quiz、exercise、exam的参考答案

import java.io.*;
import java.util.*;

public class SecondsCalculator {
	
	private static BufferedReader stdIn =
		new BufferedReader(new InputStreamReader(System.in)); 
	
	private static PrintWriter stdErr =
		new PrintWriter(System.err, true);
	
	private static PrintWriter stdOut =
		new PrintWriter(System.out, true);
	
	public static void main(String[] args) throws IOException {
		int myHour= 0, myMin= 0, mySec = 0;
		boolean justice = false;
		do {
			stdOut.print("time [hours:minutes:seconds]>");
			stdOut.flush();
			String myTime = stdIn.readLine();
			StringTokenizer tknzr = new StringTokenizer(myTime, ":");
			
			int num = tknzr.countTokens();
			if(num != 3) {
				stdErr.print("Invalid input");
				stdErr.flush();
				stdErr.println();
				continue;
			}
			else {
				myHour = Integer.parseInt(tknzr.nextToken());
				myMin = Integer.parseInt(tknzr.nextToken());
				mySec = Integer.parseInt(tknzr.nextToken());
				if(myHour > -1 && myHour < 24 && myMin >-1 && myMin < 60 && mySec >-1 && mySec <60)
					justice = true;
				else {
					stdErr.println("Invalid input");
				}
			}
		} while(!justice);
		stdOut.println("The number of seconds is: " + (myHour * 3600 + myMin * 60 + mySec));
	}
}