Token.java

public class Token {
    public final TokenType type;
    public final String lexeme;
    public final Object literal;
    public final int line;

    public Token(TokenType type, String lexeme, Object literal, int line) {
        this.type = type;
        this.lexeme = lexeme;
        this.literal = literal;
        this.line = line;
    }

    public TokenType getType() {
        return type;
    }

    public String getLexeme() {
        return lexeme;
    }

    public Object getLiteral() {
        return literal;
    }

    public int getLine() {
        return line;
    }

    @Override
    public String toString() {
        return "Token[" + type + " \"" + lexeme + "\" " + (literal == null ? "null" : literal) + " at line " + line + "]";
    }
}