From 0857874b423e35c01c1de4ebd6c19e53a68f76f8 Mon Sep 17 00:00:00 2001
From: Yuhuang Hu <duguyue100@gmail.com>
Date: Wed, 29 Feb 2012 18:19:04 +0800
Subject: [PATCH] lab 2

---
 lab_answer/lab2/Time24.java   | 104 ++++++++++++++++++++++++++++++++++
 lab_answer/lab2/TimeCard.java |  20 +++++++
 2 files changed, 124 insertions(+)
 create mode 100644 lab_answer/lab2/Time24.java
 create mode 100644 lab_answer/lab2/TimeCard.java

diff --git a/lab_answer/lab2/Time24.java b/lab_answer/lab2/Time24.java
new file mode 100644
index 0000000..4fe09ce
--- /dev/null
+++ b/lab_answer/lab2/Time24.java
@@ -0,0 +1,104 @@
+import java.text.DecimalFormat;
+import java.util.Scanner;
+
+
+public class Time24 {
+	private int hour;
+	private int minute;
+	
+	
+	private void normalizeTime()
+	{
+		int extraHours=minute/60;
+		
+		minute%=60;
+		hour=(hour+extraHours%24);
+	}
+	
+	public Time24()
+	{
+		hour=0;
+		minute=0;
+	}
+	
+	public Time24(int h, int m)
+	{
+		hour=h;
+		minute=m;
+		normalizeTime();
+	}
+	
+	public void addTime(int m)
+	{
+		if (m<0)
+		{
+			throw new IllegalArgumentException("Time24.setTime: "+ "argument must be a positive integer");
+		}
+		
+		minute+=m;
+		normalizeTime();
+	}
+	
+	public Time24 interval(Time24 t)
+	{
+		int currTime=hour*60+minute;
+		int tTime=t.hour*60+t.minute;
+		
+		if (tTime<currTime)
+			tTime+=24*60;
+		
+		return new Time24(0,tTime-currTime);
+	}
+	
+	public int getHour()
+	{
+		Scanner input=new Scanner(System.in);
+		return input.nextInt();
+	}
+	
+	public int getMinute()
+	{
+		Scanner input=new Scanner(System.in);
+		return input.nextInt();
+	}
+	
+	public void setTime(int h, int m)
+	{
+		if (h<0||m<0)
+		{
+			throw new IllegalArgumentException("Time24.setTime: "+"parameters must be positive integers");
+		}
+		
+		this.hour=h;
+		this.minute=m;
+		
+		normalizeTime();
+	}
+	
+	public String toString()
+	{
+		DecimalFormat fmt=new DecimalFormat("00");
+		return new String(hour+":"+fmt.format(minute));
+	}
+	
+	public static Time24 praseTime(String s)
+	{
+		String hours="";
+		String minutes="";
+		
+		int k=0;
+		while (s.charAt(k)!=':')
+		{
+			hours=hours+s.charAt(0);
+			k++;
+		}
+		k++;
+		while (k<s.length())
+		{
+			minutes=minutes+s.charAt(k);
+			k++;
+		}
+		
+		return new Time24(Integer.parseInt(hours),Integer.parseInt(minutes));
+	}
+}
diff --git a/lab_answer/lab2/TimeCard.java b/lab_answer/lab2/TimeCard.java
new file mode 100644
index 0000000..7d6618d
--- /dev/null
+++ b/lab_answer/lab2/TimeCard.java
@@ -0,0 +1,20 @@
+
+public class TimeCard {
+	private String workerID;
+	private double payrate;
+	private Time24 punchInTime, punchOutTime;
+	
+	public TimeCard(String id, double pr, int punchInHour, int punchInMinute)
+	{
+		workerID=id;
+		payrate=pr;
+		punchInTime.setTime(punchInHour, punchInMinute);
+	}
+	
+	public String payWorker(int punchOutHour, int punchOutMinute)
+	{
+		punchOutTime.setTime(punchOutHour, punchOutMinute);
+		Time24 result=punchOutTime.interval(punchInTime);
+		return result.toString();
+	}
+}