Merge pull request #4 from nbevacqua/master

added our cal implementation

nbevacqua-nantonov/Cal.java

@@ -0,0 +1,115 @@
+import java.util.Arrays;
+import java.util.Calendar;
+
+public class Cal {
+
+	private static int getNumDaysInMonth(int month, int year) {
+		int days;
+		boolean isLeapYear = (year % 4 == 0 && year % 100 != 0)
+				|| (year % 400 == 0);
+		switch (month) {
+		case 1:
+			days = 31;
+			break;
+		case 2:
+			if (isLeapYear)
+				days = 29;
+			else
+				days = 28;
+			break;
+		case 3:
+			days = 31;
+			break;
+		case 4:
+			days = 30;
+			break;
+		case 5:
+			days = 31;
+			break;
+		case 6:
+			days = 30;
+			break;
+		case 7:
+			days = 31;
+			break;
+		case 8:
+			days = 31;
+			break;
+		case 9:
+			days = 30;
+			break;
+		case 10:
+			days = 31;
+			break;
+		case 11:
+			days = 30;
+			break;
+		case 12:
+			days = 31;
+			break;
+		default:
+			return 31;
+		}
+
+		return days;
+	}
+
+	private static String bufferSpace(String s, int i) {
+		if (i <= 0)
+			return s;
+		if(i%2 == 0) {
+			for(int j = 0; j < i/2; j++)
+			{
+				s = (" " + s + " ");
+			}
+		} else {
+			for(int j = 0; j < i/2; j++)
+			{
+				s = (" " + s + " ");
+			}
+			s = " "+s;
+		}
+
+		return s;
+	}
+
+
+	public static void main(String[] args) {
+		String[] months = new String[] {"January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"};
+		String dayOfWeekStr = "Su Mo Tu We Th Fr Sa";
+		Calendar cal = Calendar.getInstance();
+
+		if(args.length == 2) {
+			int monthInt = Integer.parseInt(args[0])-1;
+			int yearInt = Integer.parseInt(args[1]);
+			cal.set(Calendar.MONTH, monthInt);
+			cal.set(Calendar.YEAR, yearInt);
+		}
+		cal.set(Calendar.DAY_OF_MONTH, 1);
+
+		String titleString = months[cal.get(Calendar.MONTH)]+" "+cal.get(Calendar.YEAR);
+		titleString = bufferSpace(titleString, dayOfWeekStr.length()-titleString.length());
+		System.out.println(titleString);
+		System.out.println(dayOfWeekStr);
+
+
+		String[] data = new String[7];
+		Arrays.fill(data, "");
+		String printfString = "%2s %2s %2s %2s %2s %2s %2s";
+		int dayOfWeek = cal.get(Calendar.DAY_OF_WEEK)-1;
+
+		for(int i = 0; i < getNumDaysInMonth(cal.get(Calendar.MONTH)+1, cal.get(Calendar.YEAR)); i++) {
+			data[dayOfWeek++] = ""+(i+1);
+			if(dayOfWeek == 7) {
+				dayOfWeek = 0;
+				System.out.println(String.format(printfString, data[0], data[1], data[2], data[3], data[4], data[5], data[6]));
+				Arrays.fill(data, "");
+			}
+
+			if(i == getNumDaysInMonth(cal.get(Calendar.MONTH)+1, cal.get(Calendar.YEAR))-1) {
+				System.out.println(String.format(printfString, data[0], data[1], data[2], data[3], data[4], data[5], data[6]));
+			}
+		}
+	}
+
+}