Changed internal type of boolean, because it's obviously Z not B haha

Test/JavaSources/Main.java

@@ -11,6 +11,7 @@ public class Main {
         TestEmpty empty = new TestEmpty();
         TestFields fields = new TestFields();
         TestConstructor constructor = new TestConstructor(42);
+        TestArithmetic arithmetic = new TestArithmetic();
         TestMultipleClasses multipleClasses = new TestMultipleClasses();
         TestRecursion recursion = new TestRecursion(10);
         TestMalicious malicious = new TestMalicious();
@@ -21,6 +22,10 @@ public class Main {
         assert fields.a == 0 && fields.b == 42;
         // constructor parameters override initializers
         assert constructor.a == 42;
+        // basic arithmetics
+        assert arithmetic.basic(1, 2, 3) == 2;
+        // we have boolean logic as well
+        assert arithmetic.logic(true, false, true) == true;
         // multiple classes within one file work. Referencing another classes fields/methods works.
         assert multipleClasses.a.a == 42;
         // self-referencing classes work.

Test/JavaSources/TestArithmetic.java

@@ -0,0 +1,11 @@
+public class TestArithmetic {
+    public int basic(int a, int b, int c)
+    {
+        return a + b - c * a / b % c;
+    }
+
+    public boolean logic(boolean a, boolean b, boolean c)
+    {
+        return a && (c || b);
+    }
+}

Test/JavaSources/TestRecursion.java

@@ -24,4 +24,11 @@ public class TestRecursion {
             return fibonacci(n - 1) + this.fibonacci(n - 2);
         }
     }
+
+    public int ackermann(int m, int n)
+    {
+        if (m == 0) return n + 1;
+        if (n == 0) return ackermann(m - 1, 1);
+        return ackermann(m - 1, ackermann(m, n - 1));
+    }
 }

src/ByteCode/Builder.hs

@@ -65,7 +65,7 @@ methodAssembler (MethodDeclaration returntype name parameters statement) input =
         Just index -> let
                 declaration = MethodDeclaration returntype name parameters statement
                 paramNames = "this" : [name | ParameterDeclaration _ name <- parameters]
-            in case (splitAt index (methods input)) of
+            in case splitAt index (methods input) of
                 (pre, []) -> input
                 (pre, method : post) -> let
                         (constants, bytecode, aParamNames) = assembleMethod (constantPool input, [], paramNames) declaration

src/ByteCode/Util.hs

@@ -43,7 +43,7 @@ parseMethodType :: ([String], String) -> String -> ([String], String)
 parseMethodType (params, returnType) ('(' : descriptor) = parseMethodType (params, returnType) descriptor
 parseMethodType (params, returnType) ('I' : descriptor) = parseMethodType (params ++ ["I"], returnType) descriptor
 parseMethodType (params, returnType) ('C' : descriptor) = parseMethodType (params ++ ["C"], returnType) descriptor
-parseMethodType (params, returnType) ('B' : descriptor) = parseMethodType (params ++ ["B"], returnType) descriptor
+parseMethodType (params, returnType) ('Z' : descriptor) = parseMethodType (params ++ ["Z"], returnType) descriptor
 parseMethodType (params, returnType) ('L' : descriptor) = let
         typeLength = elemIndex ';' descriptor
     in case typeLength of
@@ -53,7 +53,7 @@ parseMethodType (params, returnType) ('L' : descriptor) = let
                 parseMethodType (params ++ [typeName], returnType) restOfDescriptor
         Nothing -> error $ "unterminated class type in function signature: " ++ (show descriptor)
 parseMethodType (params, _) (')' : descriptor) = (params, descriptor)
-parseMethodType _ descriptor = error $ "expected start of type name (L, I, C, B) but got: " ++ descriptor
+parseMethodType _ descriptor = error $ "expected start of type name (L, I, C, Z) but got: " ++ descriptor
 
 -- given a method index (constant pool index), 
 -- returns the full type of the method. (i.e (LSomething;II)V)
@@ -76,7 +76,7 @@ datatypeDescriptor :: String -> String
 datatypeDescriptor "void" = "V"
 datatypeDescriptor "int" = "I"
 datatypeDescriptor "char" = "C"
-datatypeDescriptor "boolean" = "B"
+datatypeDescriptor "boolean" = "Z"
 datatypeDescriptor x = "L" ++ x ++ ";"