Bug: self-referencing grammer fixed

fixed self referencing grammer fixed and also connected the two file ,parser and grammer. initial parser code added

ExprParser.g4

@@ -0,0 +1,36 @@
+parser grammar ExprParser;
+
+options {
+    tokenVocab=ExprLexer;
+}
+
+// Class Parser rules
+prog : class EOF;
+
+class:(Public | Private | Protected ) Class ID SLPAREN method+ SRPAREN;
+
+//Method Decloration
+method: Public Static Void ID LPAREN arg* RPAREN SLPAREN methodCode SRPAREN
+        | Private Static Void ID SLPAREN methodCode SRPAREN
+        | Protected Static Void ID SLPAREN methodCode SRPAREN
+        ;
+
+methodCode: systemOutPrint* forloop*
+          ;
+
+systemOutPrint
+    : SYSTEM DOT OUT DOT PRINT LPAREN data RPAREN SEMI;
+
+forloop: For LPAREN arg RPAREN SLPAREN methodCode SRPAREN;
+
+arg: String arraydef* ID
+   | exp SEMI exp SEMI exp
+   ;
+
+exp: define
+    | ID GreterEql INTE
+    | ID INCMENT
+    ;
+define :  Int ID EQL INTE;
+arraydef: SqLPAREN (data T)* SqRPAREN;
+data: STRING ;