Removed spaces from top-level directory names.

Spaces tend to cause annoyances in a Unix-style shell environment.
This change fixes that.

61_Math_Dice/java/Die.java

@@ -0,0 +1,73 @@
+import java.util.Random;
+
+public class Die {
+    private static final int DEFAULT_SIDES = 6;
+    private int faceValue;
+    private int sides;
+    private Random generator = new Random();
+
+    /**
+     * Construct a new Die with default sides
+     */
+    public Die() {
+        this.sides = DEFAULT_SIDES;
+        this.faceValue = 1 + generator.nextInt(sides);
+    }
+
+    /**
+     * Generate a new random number between 1 and sides to be stored in faceValue
+     */
+    private void throwDie() {
+        this.faceValue = 1 + generator.nextInt(sides);
+    }
+
+    
+    /** 
+     * @return the faceValue
+     */
+    public int getFaceValue() {
+        return faceValue;
+    }
+
+    
+    public void printDie() {
+        throwDie();
+        int x = this.getFaceValue();
+
+        System.out.println(" ----- ");
+
+        if(x==4||x==5||x==6) {
+            printTwo();
+        } else if(x==2||x==3) {
+            System.out.println("| *   |");
+        } else {
+            printZero();
+        }
+
+        if(x==1||x==3||x==5) {
+            System.out.println("|  *  |");
+        } else if(x==2||x==4) {
+            printZero();
+        } else {
+            printTwo();
+        }
+
+        if(x==4||x==5||x==6) {
+            printTwo();
+        } else if(x==2||x==3) {
+            System.out.println("|   * |");
+        } else {
+            printZero();
+        }
+
+        System.out.println(" ----- ");
+    }
+
+    private void printZero() {
+        System.out.println("|     |");
+    }
+
+    private void printTwo() {
+        System.out.println("| * * |");
+    }
+}

61_Math_Dice/java/MathDice.java

@@ -0,0 +1,53 @@
+import java.util.Scanner;
+
+public class MathDice {
+
+    public static void main(String[] args) {
+        Scanner in = new Scanner(System.in);
+        Die dieOne = new Die();
+        Die dieTwo = new Die();
+        int guess = 1;
+        int answer;
+
+        System.out.println("Math Dice");
+        System.out.println("https://github.com/coding-horror/basic-computer-games");
+        System.out.println();
+        System.out.print("This program generates images of two dice.\n"
+                + "When two dice and an equals sign followed by a question\n"
+                + "mark have been printed, type your answer, and hit the ENTER\n" + "key.\n"
+                + "To conclude the program, type 0.\n");
+
+        while (true) {
+            dieOne.printDie();
+            System.out.println("   +");
+            dieTwo.printDie();
+            System.out.println("   =");
+            int tries = 0;
+            answer = dieOne.getFaceValue() + dieTwo.getFaceValue();
+
+            while (guess!=answer && tries < 2) {
+                if(tries == 1)
+                    System.out.println("No, count the spots and give another answer.");
+                try{
+                    guess = in.nextInt();
+                } catch(Exception e) {
+                    System.out.println("Thats not a number!");
+                    in.nextLine();
+                }
+
+                if(guess == 0) 
+                    System.exit(0);
+                
+                tries++;
+            }
+
+            if(guess != answer){
+                System.out.println("No, the answer is " + answer + "!");
+            } else {
+                System.out.println("Correct");
+            }
+            System.out.println("The dice roll again....");
+        }
+    }
+
+}

61_Math_Dice/java/README.md

@@ -0,0 +1,3 @@
+Original source downloaded [from Vintage Basic](http://www.vintage-basic.net/games.html)
+
+Conversion to [Oracle Java](https://openjdk.java.net/)