old-java-games

java games my brother and I developed as kids.
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Easter.java (4312B)

      1 public class Easter
      2 {
      3     private static String USER1 = "Michael";
      4     private static String USER2 = "Stephen";
      5     private static String CONSTANT1 = "DFCHQ";
      6     private static String CONSTANT2 ="MAINCOREOFWEAS";
      7     /**
      8      * Main entry point for Easter class.
      9      *
     10      * @param parameters is an array of string parameters of any size
     11      * 'void' means it doesn't return a result value, like a function would
     12      * don't worry about the 'static' word - it's mandatory for standalone programs
     13      */
     14     public static void main(String[] parameters)
     15     {
     16         int i = 0;
     17         String valuea = "";
     18         String valueb = "";
     19         String text = "Go and look here: ";
     20         boolean variable1 = true, variable2 = false, variable3 = true;
     21         if (parameters.length < 1)
     22         {
     23             System.out.println("Please put your name as the parameter to this program and try running it again");
     24         }
     25         else if (USER1.equalsIgnoreCase(parameters[0]) || USER2.equalsIgnoreCase(parameters[0]))   // || means 'OR'
     26         {
     27             System.out.println("Welcome, " + parameters[0]);  // print out to the screen element 0 (the first element) in the array
     28             if (USER1.equalsIgnoreCase(parameters[0]))        // case-independent comparison, i.e. 'M' matches 'm'
     29             {
     30                 valuea = CONSTANT1;
     31                 if (variable1 || variable2)
     32                 {
     33                     valuea = valuea + 'E';
     34                 }
     35                 if (variable2 && variable3)       // && means 'AND'
     36                 {
     37                     valuea = valuea + 'E';
     38                 }
     39                 valueb = doSomething(valuea);
     40                 i = 0;
     41                 while (i < valueb.length())
     42                 {
     43                     // add 1 to character at position i
     44                     char c = (char) (valueb.charAt(i) + 1);  // in order to add 1 to a character it has to be of type 'char' rather than String - don't worry about it!
     45                     text = text + c; // charAt(i) gives you the character at position(i). NB first character is at position 0
     46                     i = i + 1;
     47                 }
     48             }
     49             else if (USER2.equalsIgnoreCase(parameters[0]))
     50             {
     51                 valueb = CONSTANT2;
     52                 // charAt(i) gives you the character at position(i). NB first character is at position 0
     53                 // && means 'AND'; 0x in front of a number means that number is hexadecimal
     54                 if (0x11 > 15 && USER1.charAt(0) > valueb.charAt(0))
     55                 {
     56                      valueb = valueb + "AV";
     57                 }
     58                 else
     59                 {
     60                      valueb = valueb + "VA";
     61                 }
     62                 if (Math.sqrt(121) > 8)   // sqrt means 'square root'
     63                 {
     64                     valueb = valueb + 'E';
     65                 }
     66                 else
     67                 {
     68                     valueb = valueb + 'A';
     69                 }
     70                 if (variable1 && (variable2 || variable3))       // && means 'AND'; || means 'OR'
     71                 {
     72                     valueb = valueb + 'R';
     73                 }
     74                 else
     75                 {
     76                     valueb = valueb + 'S';
     77                 }
     78                 i = 0;
     79                 while (i < valueb.length())
     80                 {
     81                     if (i % 2 == 0)     // % is the modulo or 'remainder' function (i.e. remainder from dividing) and != means not equal to
     82                     {
     83                         text = text + (valueb.charAt(i)); // charAt(i) gives you the character at position(i). NB first character is at position 0
     84                     }
     85                     i = i + 1;
     86                 }
     87             }
     88             System.out.println(text);
     89         }
     90         else
     91         {
     92             System.out.println("Sorry, " + parameters[0] + " gets nothing");
     93         }
     94 
     95     }
     96 
     97     private static String doSomething(String input)
     98     {
     99         String result = "";
    100         if (input.length() > 1)
    101         {
    102             result = doSomething(input.substring(1, input.length())); // do something with the substring minus the first character (substring from element 1 to the end)
    103         }
    104         result = result + input.charAt(0); // charAt(0) means the first character 
    105         return result;
    106     }
    107 
    108 }