There is an error for TokenHandler.java. Please fix that error. 12131415016171819202122230242526270282930313233340353637038€3940414243440454647 }4849}public Optional Peek(int j) {if (j tokens.size()) {}this.tokens = tokens;}} else {}public boolean MoreTokens () {return !tokens.isEmpty();return Optional.of(tokens.get(j));}public Optional MatchAnd Remove (TokenType t) {if (More Tokens () && Peek (0).get().getType() == t) {return Optional.of(tokens.remove (0)); // Remove and return a token of specified type} else {return Optional.empty();}}public Token getCurrentToken () {return getCurrentToken();}}publicreturn Optional.empty();}public void consumeToken() {if (MoreTokens()) {}else {retugetcurrentToken = tokens.remove(0);getcurrentToken=null;getcurrentToken cannot be resolved to a variable4 quick fixes available:Create local variable 'getcurrentToken'Create field 'getcurrentToken'• Create parameter 'getcurrentToken'X Remove assignment

Answered: There is an error for…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

There is an error for TokenHandler.java. Please fix that error.

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}
public Optional<Token > Peek(int j) {
if (j tokens.size()) {
}
this.tokens = tokens;
}
} else {
}
public boolean MoreTokens () {
return !tokens.isEmpty();
return Optional.of(tokens.get(j));
}
public Optional<Token> MatchAnd Remove (TokenType t) {
if (More Tokens () && Peek (0).get().getType() == t) {
return Optional.of(tokens.remove (0)); // Remove and return a token of specified type
} else {
return Optional.empty();
}
}
public Token getCurrentToken () {
return getCurrentToken();
}
}
public
return Optional.empty();
}
public void consumeToken() {
if (MoreTokens()) {
}else {
retu
getcurrentToken = tokens.remove(0);
getcurrentToken=null;
getcurrentToken cannot be resolved to a variable
4 quick fixes available:
Create local variable 'getcurrentToken'
Create field 'getcurrentToken'
• Create parameter 'getcurrentToken'
X Remove assignment

Expert Solution

Step 1: TokenHandler.java

Here's how your modified TokenHandler.java would look with these methods added: without errors, assuming that the Token and TokenType classes are defined in the correct package and have appropriate access modifiers:

1import java.util.LinkedList;
2import java.util.Optional;
3
4public class TokenHandler {
5
6    private LinkedList<Token> tokens; // List of tokens
7    private Token lastMatchedToken; // To store the last matched token
8
9    public TokenHandler(LinkedList<Token> tokens) {
10        this.tokens = tokens;
11    }
12
13    public Optional<Token> Peek(int j) {
14        if (j < tokens.size()) {
15            return Optional.of(tokens.get(j));
16        } else {
17            return Optional.empty();
18        }
19    }
20
21    public boolean MoreTokens() {
22        return !tokens.isEmpty();
23    }
24
25    public Optional<Token> getCurrentToken() {
26        if (MoreTokens()) {
27            return Optional.of(tokens.get(0));
28        } else {
29            return Optional.empty();
30        }
31    }
32
33    public Optional<Token> consumeToken() {
34        if (MoreTokens()) {
35            lastMatchedToken = tokens.remove(0);
36            return Optional.of(lastMatchedToken);
37        } else {
38            return Optional.empty();
39        }
40    }
41
42    public Optional<Token> getLastMatchedToken() {
43        return Optional.ofNullable(lastMatchedToken);
44    }
45
46    public Optional<Token> MatchAndRemove(TokenType t) {
47        if (MoreTokens() && Peek(0).get().getType() == t) {
48            return consumeToken();
49        } else {
50            return Optional.empty();
51        }
52    }
53}
54

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