secondscalculator.java

JAVA编程 SSD3 UNIT1完全答案 满分作业!! CMU经典课程

/**
 *
 * <p>Title: SecondsCalculator</p>
 * <p>Description: calculate the seconds according to the input</p>
 * <p>Copyright: Copyright (c) 2006</p>
 * <p>Company: </p>
 * @author liuyongdong
 * @version 1.0
 */
import java.io.*;
import java.util.*;

public class SecondsCalculator {
	//ONE - initialize time and reset the time whose value is -1
	private static final int ONE = -1;

	//RATE1 - the rate from hour to second
	private static final int RATE1 = 3600;

	// RATE2 - the rate from minute to second
	private static final int RATE2 = 60;

	//the standard input 
	private static BufferedReader stdIn = new BufferedReader(
			new InputStreamReader(System.in));

	// the standard output
	private static PrintWriter stdOut = new PrintWriter(System.out, true);

	//the standard error output
	private static PrintWriter stdErr = new PrintWriter(System.err, true);
	
	//initialize hour 
	private static int hour = ONE;

	//initialize minute 
	private static int minute = ONE;

	//initialize second
	private static int second = ONE;

	//store the totle second 
	private static int sum;

	private static int numOfTokenizer;

	private static StringTokenizer tokenizer;

	/**
	 * constructor
	 * @throws IOException
	 */
	public SecondsCalculator() throws IOException {
		input();
		calculator();
	}

	/**
	 * get the input
	 * @throws IOException
	 */
	public static void input() throws IOException {
		do {
			stdErr.print("time [ hour : minute : second ]> ");
			stdErr.flush();
			tokenizer = new StringTokenizer(stdIn.readLine(), ":");

			setNumOfTokenizer();
			try {
				setTime();
				if (3 != getNumOfTokenizer() || getHour() < 0
						|| getHour() >= 24 || getMinute() < 0
						|| getMinute() >= 60 || getSecond() < 0
						|| getSecond() >= 60) {
					stdErr.println("Invalid input!");
					resetTime();
				}
			} catch (NumberFormatException ex) {
				stdErr.println(ex.toString());
			} catch (NoSuchElementException nsee) {
				stdErr.println("Invalid Enter!");
			}
		} while (3 != getNumOfTokenizer() || getHour() < 0 || getHour() >= 24
				|| getMinute() < 0 || getMinute() >= 60 || getSecond() < 0
				|| getSecond() >= 60);
	}

	private static void resetTime() {
		// TODO Auto-generated method stub
		hour = ONE;
		minute = ONE;
		second = ONE;		
	}

	/**
	 * set the hour
	 */
	private static void setHour() {
		hour = Integer.parseInt(tokenizer.nextToken());
	}

	/**
	 * set the minute
	 */
	private static void setMinute() {
		minute = Integer.parseInt(tokenizer.nextToken());
	}

	/**
	 * set the second
	 */
	private static void setSecond() {
		second = Integer.parseInt(tokenizer.nextToken());
	}

	/**
	 * set the setNumOfTokenizer
	 */
	private static void setNumOfTokenizer() {
		numOfTokenizer = tokenizer.countTokens();
	}

	/**
	 * set the time
	 */
	private static void setTime() {
		setHour();
		setMinute();
		setSecond();
	}

	/**
	 * @return the hour
	 */
	public static int getHour() {
		return hour;
	}

	/**
	 * @return the minute
	 */
	public static int getMinute() {
		return minute;
	}

	/**
	 * @return the second
	 */
	public static int getSecond() {
		return second;
	}

	/**
	 * @return the setNumOfTokenizer
	 */
	public static int getNumOfTokenizer() {
		return numOfTokenizer;
	}

	/**
	 * calculate the seconds
	 */
	private static void calculator() {
		sum = hour * RATE1 + minute * RATE2 + second;
	}

	/**
	 * @return the sum of seconds
	 */
	public static int getSum() {
		return sum;
	}

	/**
	 * @return a String to show a output
	 */
	public String toString() {
		return "The number of second is " + getSum();
	}

	public static void main(String[] args) throws IOException {
		SecondsCalculator sc = new SecondsCalculator();
		stdOut.println(sc.toString());
	}
}