secondscalculator.java

卡耐基教程SSD3中所有exercise和quiz的全部答案

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


public class SecondsCalculator {
    private static BufferedReader  stdIn =
        new BufferedReader(new  InputStreamReader(System.in));

    private static PrintWriter  stdOut =
        new PrintWriter(System.out, true);
 
    private static PrintWriter  stdErr =
        new PrintWriter(System.err, true);
    public static void main(String[] args) throws IOException{
    	String time;
    	int hour,minute,second,totalseconds,parts;
    	for(;;){
    		try{
    			stdOut.print("time [hours:minutes:seconds]>");
    			stdOut.flush();
    			hour=0;minute=0;second=0;
    			time=stdIn.readLine();
    			StringTokenizer k=new StringTokenizer(time,":");
    			parts=k.countTokens();
    			if(parts!=3) stdOut.println("Invalid input");
    			else{
    				hour=Integer.parseInt(k.nextToken());
        			minute=Integer.parseInt(k.nextToken());
        			second=Integer.parseInt(k.nextToken());
        			totalseconds=hour*3600+minute*60+second;
        			 if(hour<=23 & hour>=0 & minute<=59 & minute>=0 & second<=59 & second>=0){
    				stdOut.println("The number of seconds is:"+totalseconds);
    				break;}
    			    else stdOut.println("Invalid input"); 
    			}
    			
    		}catch(NumberFormatException nfe){
    	            stdErr.println(nfe);
    			
    		}
    		
    	}
    	
    }


}