add Demo files for easier testing

demo/Fibonacci.java

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+public class Fibonacci {
+    public static void main(String[] args) {
+        int a = 0;
+        int b = 1;
+        for (int i = 0; i < 20; i++) {
+            print(a);
+            int temp = a;
+            a = b;
+            b = temp + b;
+        }
+    }
+}

demo/PrintNumbers.java

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+public class PrintNumbers {
+    public int start;
+    public int max;
+    
+    public PrintNumbers(int start, int max) {
+        this.start = start;
+        this.max = max;        
+    }
+
+    public void start() {
+        do {
+            this.start += 1;
+            if(this.start == 6) {
+                continue;
+            }
+            if(this.start >= 12) {
+                break;
+            }
+	    print(this.start);
+        } while (this.start <= this.max);
+    }
+    public static void main(String[] args) {
+        PrintNumbers p = new PrintNumbers(0, 12);
+        p.start();
+    }
+}

demo/Test.java

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+public class Test {
+    public static void main(String[] args) {
+        print(true); // prints true
+        print('a'); // prints 'a'
+        print(5); // prints 5
+
+        boolean b = true;
+        char c = 'x';
+        int i = 3;
+
+        print(b); // prints true
+        print(c); // prints x
+        print(i); // prints 3
+
+        boolean result = !b && true;
+        print(result); // prints false
+
+        print(c); // prints {x}
+    }
+}

demo/Test1.java

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+public class Test1 {
+    public void printResult(int a, int b) {
+        Test2 t = new Test2();
+        print(t.multiply(a, b));
+    }
+
+    public static void main(String[] args) {
+        Test1 t = new Test1();
+        t.printResult(12, 8);
+    }
+}

demo/Test2.java

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+public class Test2 {
+
+    public int multiply(int a, int b) {
+        return a * b;
+    }
+}