I got errors in parser.java. How to create methods in TokenHandler.java for getCurrentToken(), consumeToken(), getLastMatchedToken()? Please create these methods in TokenHandler.java. Fix the error for programNode that is attached. Below is TokenHandler.java   TokenHandler.java import java.util.LinkedList; import java.util.Optional; import mypack.Token.TokenType;   public class TokenHandler {   private LinkedList tokens;// List of tokens       public TokenHandler(LinkedList tokens) {         this.tokens = tokens;     }       public Optional Peek(int j) {         if (j < tokens.size()) {             return Optional.of(tokens.get(j));         } else {             return Optional.empty();         }     }       public boolean MoreTokens() {         return !tokens.isEmpty();     }       public Optional MatchAndRemove(TokenType t) {         if (MoreTokens() && Peek(0).get().getType() == t) {             return Optional.of(tokens.remove(0)); // Remove and return a token of specified type         } else {             return Optional.empty();         }     } }

Java Code:  Create a Parser class. Much like the Lexer, it has a constructor that accepts a LinkedList of Token and creates a TokenManager that is a private member. The next thing that we will build is a helper method – boolean AcceptSeperators(). One thing that is always tricky in parsing languages is that people can put empty lines anywhere they want in their code. Since the parser expects specific tokens in specific places, it happens frequently that we want to say, “there HAS to be a “;” or a new line, but there can be more than one”. That’s what this function does – it accepts any number of separators (newline or semi-colon) and returns true if it finds at least one. Create a Parse method that returns a ProgramNode. While there are more tokens in the TokenManager, it should loop calling two other methods – ParseFunction() and ParseAction(). If neither one is true, it should throw an exception. bool ParseFunction(ProgramNode) bool ParseAction(ProgramNode) -Creates ProgramNode,…

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in java please.Create a method from the implementation perspective. Create a method where it takes in a linked chain of values and adds them in order to the front.  method header:public void addToFront(ANode<T> first)