added check if there is a main method

src/main/java/abstractSyntaxTree/Class/RefType.java

@@ -20,7 +20,7 @@ public class RefType extends AbstractType implements Node {
     public String name; // Class Name
     public List<FieldDecl> fieldDecls;
     public List<MethodDecl> methodDecls;
-    boolean hasMain;
+    public boolean hasMain;
 
     public RefType(String name,
                    List<FieldDecl> fieldDecls,

src/main/java/abstractSyntaxTree/Program.java

@@ -53,6 +53,16 @@ public class Program implements Node {
             methodContext.put(oneClass.name, identifierAndMethod);
         }
 
+
+        int mainCounter = 0;
+        // check if main exists
+        for(RefType oneClass : classes){
+            if(oneClass.hasMain)
+                mainCounter++;
+        }
+        if(mainCounter != 1)
+            throw new TypeCheckException("There is not 1 Main method.");
+
         // typecheck each class
         TypeCheckResult result = new TypeCheckResult();
         for(RefType oneClass : classes){

src/main/java/abstractSyntaxTree/StatementExpression/MethodCallStatementExpression.java

@@ -58,7 +58,6 @@ public class MethodCallStatementExpression extends AbstractType implements IExpr
         //if classToSearchMethodIn does not conatin method, throw exception. go through list and check each
 
         for(int i = 0; i < receivingMethods.size(); i++){
-            //todo throw exception
             currentType = (String) methodContext.get(currentType).get(receivingMethods.get(i).methodName).keySet().toArray()[0];
             if(currentType == null)
                 throw new TypeCheckException("The method " + methodName + " was not found in "+ classToSearchMethodIn + ".");
@@ -67,12 +66,6 @@ public class MethodCallStatementExpression extends AbstractType implements IExpr
 
         }
         currentType = (String) methodContext.get(currentType).get(methodName).keySet().toArray()[0];
-        // todo  checkparameter
-//        if(method == null)
-//            throw new TypeCheckException("The method " + methodName + " was not found in "+ classToSearchMethodIn + ".");
-
-        // typecheck arguments
-
 
         TypeCheckResult result = new TypeCheckResult();
         result.type = currentType;