BigTime.java

import java.util.*;     // for GregorianCalendar

public class BigTime {

    public static void main(String[] args) {

        /**
        *   Program: BigTime.java
        *   Purpose: Command line Digital clock with large scrolling display
        *   Creator: Chris Clarke
        *   Created: 17-18.01.2011
        *   Modified: 19.10.2012 add Thread.sleep(), reposition display
        */

        // method call to create digits
        createDigits();

        while (true) {
            strTime = "";
            // clear screen
            for (int i = 0; i < 25; i++) {
                // slow down scrolling
                slowItDown(40);
                System.out.println();
            } // end for

            // create instance of calendar
            GregorianCalendar now = new GregorianCalendar();
            int hour = now.get(Calendar.HOUR);
            int amPm = now.get(Calendar.AM_PM);
            int minute = now.get(Calendar.MINUTE);

            if (hour == 0) {
                hour = 12;
            } // end if
            // "01", "02" etc instead of "1", "2" etc
            if (hour < 10) {
                strTime += " "; // add a space
                // or strTime += "0"; // or add a zero
            } // end if
            strTime += hour;
                strTime += ":";
            // "00", "01", "02" etc instead of "0", "1", "2"
            if (minute<10) {
                strTime += "0";
            } // end if
            strTime += minute;

            // method call to display large characters
            displayLetters( amPm);

            int newMinute;
            // loop until newMinute changes
            do {
                GregorianCalendar later = new GregorianCalendar();
                // create new instance of calendar
                newMinute = later.get(Calendar.MINUTE);
                // get current minute
            } while (newMinute == minute);
        } // end while
    } // end main

    public static void slowItDown(int amount) {
        try {
            Thread.sleep(amount);
        } catch (Exception x) {
            System.out.println("Caught Exception! " + x.getMessage());
        } // end try...catch
    } // end slowItDown

    public static void displayLetters( int amPm) {
        String ch = "";
        int digitNum = 0;
        for (int row = 0; row < 7; row++) {
            // slow down scrolling of text
            slowItDown(40);

            System.out.print("\t\t");
            for (int i = 0; i < 5; i++) {
                // separate into 5 Strings
                ch = strTime.substring(i, i+1);
                if (i == 2) {
                    // colon
                    digitNum = 11;
                } else {
                    if (ch.equals(" " )) {
                        // space
                        digitNum = 10;
                    } else {
                        // number 0-9
                        digitNum = Integer.parseInt(ch);
                    } // end if
                } // end if
                System.out.print(digit[digitNum][row]);
                // add space
                System.out.print(" ");
            } // end for i
            if (amPm == 0) {
                // "a" for "am"
                digitNum = 12;
            } else {
                // "p" for "pm"
                digitNum = 13;
            } // end if
            System.out.print(digit[digitNum][row]);
            System.out.println(digit[14][row]); // "m" for am/pm
        } // end for row
        for (int j = 0; j < 9; j++) { // move text up 9 rows
            // slow down scrolling of text
            slowItDown(40);
            System.out.println();   // new line
        } // end for j
    } // end displayLargeCharacters

    public static void createDigits() {

        digit[0][0] = " 888 ";
        digit[0][1] = "8   8";
        digit[0][2] = "8  88";
        digit[0][3] = "8 8 8";
        digit[0][4] = "88  8";
        digit[0][5] = "8   8";
        digit[0][6] = " 888 ";

        digit[1][0] = "   8 ";
        digit[1][1] = "  88 ";
        digit[1][2] = "   8 ";
        digit[1][3] = "   8 ";
        digit[1][4] = "   8 ";
        digit[1][5] = "   8 ";
        digit[1][6] = "  888";

        digit[2][0] = " 888 ";
        digit[2][1] = "8   8";
        digit[2][2] = "    8";
        digit[2][3] = "   8 ";
        digit[2][4] = "  8  ";
        digit[2][5] = " 8   ";
        digit[2][6] = "88888";

        digit[3][0] = " 888 ";
        digit[3][1] = "8   8";
        digit[3][2] = "    8";
        digit[3][3] = "  888";
        digit[3][4] = "    8";
        digit[3][5] = "8   8";
        digit[3][6] = " 888 ";

        digit[4][0] = "   8 ";
        digit[4][1] = "  88 ";
        digit[4][2] = " 8 8 ";
        digit[4][3] = "8  8 ";
        digit[4][4] = "88888";
        digit[4][5] = "   8 ";
        digit[4][6] = " 8888";

        digit[5][0] = "88888";
        digit[5][1] = "8    ";
        digit[5][2] = "8888 ";
        digit[5][3] = "    8";
        digit[5][4] = "    8";
        digit[5][5] = "8   8";
        digit[5][6] = " 888 ";

        digit[6][0] = " 888 ";
        digit[6][1] = "8    ";
        digit[6][2] = "8    ";
        digit[6][3] = "8888 ";
        digit[6][4] = "8   8";
        digit[6][5] = "8   8";
        digit[6][6] = " 888 ";

        digit[7][0] = "88888";
        digit[7][1] = "    8";
        digit[7][2] = "    8";
        digit[7][3] = "   8 ";
        digit[7][4] = "  8  ";
        digit[7][5] = "  8  ";
        digit[7][6] = "  8  ";

        digit[8][0] = " 888 ";
        digit[8][1] = "8   8";
        digit[8][2] = "8   8";
        digit[8][3] = " 888 ";
        digit[8][4] = "8   8";
        digit[8][5] = "8   8";
        digit[8][6] = " 888 ";

        digit[9][0] = " 888 ";
        digit[9][1] = "8   8";
        digit[9][2] = "8   8";
        digit[9][3] = " 8888";
        digit[9][4] = "    8";
        digit[9][5] = "    8";
        digit[9][6] = " 888 ";

        digit[10][0] = "     ";
        digit[10][1] = "     ";
        digit[10][2] = "     ";
        digit[10][3] = "     ";
        digit[10][4] = "     ";
        digit[10][5] = "     ";
        digit[10][6] = "     ";

        digit[11][0] = "   ";
        digit[11][1] = " 8 ";
        digit[11][2] = "   ";
        digit[11][3] = "   ";
        digit[11][4] = "   ";
        digit[11][5] = " 8 ";
        digit[11][6] = "   ";

        digit[12][0] = "     ";
        digit[12][1] = "     ";
        digit[12][2] = "  88 ";
        digit[12][3] = "    8";
        digit[12][4] = "  888";
        digit[12][5] = " 8  8";
        digit[12][6] = "  888";

        digit[13][0] = "     ";
        digit[13][1] = "     ";
        digit[13][2] = "  88 ";
        digit[13][3] = " 8  8";
        digit[13][4] = " 888 ";
        digit[13][5] = " 8   ";
        digit[13][6] = " 8   ";

        digit[14][0] = "      ";
        digit[14][1] = "      ";
        digit[14][2] = "  8 8 ";
        digit[14][3] = " 8 8 8";
        digit[14][4] = " 8 8 8";
        digit[14][5] = " 8 8 8";
        digit[14][6] = " 8 8 8";

    } // end createDigits

    private static String strTime;
    private static String[][] digit = new String[15][7];

} // end class