Lexical.java

import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class JavaApplication3 {
    public static void main(String[] args) {
        
        Scanner in = new Scanner(System.in);
        String line = in.nextLine();
        
        String wordpattern = "[a-z_0-9]*[a-z][0-9]*";
        Pattern word = Pattern.compile(wordpattern);
        Matcher wordmatcher = word.matcher(line);
        while(wordmatcher.find()){
            System.out.println("TOKEN: " + wordmatcher.group(0));
            if( wordmatcher.group(0).matches("float|int|double")){
                System.out.println("SYMBOLIC NAME: DATA TYPE");         
            }else{
                System.out.println("SYMBOLIC NAME: IDENTIFIER");
            }
        }
        
        String digitpattern = "[0-9]*[0-9]";
        Pattern digit = Pattern.compile(digitpattern);
        Matcher digitmatcher = digit.matcher(line);
        while(digitmatcher.find()){
            System.out.println("TOKEN: " + digitmatcher.group(0));
            System.out.println("SYMBOLIC NAME: NUM");
        }
        
        String pluspattern = "[+]";
        Pattern plus = Pattern.compile(pluspattern);
        Matcher plusmatcher = plus.matcher(line);
        while(plusmatcher.find()){
            System.out.println("TOKEN: " + plusmatcher.group(0));
            System.out.println("SYMBOLIC NAME: PLUS");
        }
        
        String minuspattern = "[-]";
        Pattern minus = Pattern.compile(minuspattern);
        Matcher minusmatcher = minus.matcher(line);
        while(minusmatcher.find()){
            System.out.println("TOKEN: " + minusmatcher.group(0));
            System.out.println("SYMBOLIC NAME: MINUS");
        }
        
        String timespattern = "[*]";
        Pattern times = Pattern.compile(timespattern);
        Matcher timesmatcher = times.matcher(line);
        while(timesmatcher.find()){
            System.out.println("TOKEN: " + timesmatcher.group(0));
            System.out.println("SYMBOLIC NAME: TIMES");
        }
        
        String dividepattern = "[/]";
        Pattern divide = Pattern.compile(dividepattern);
        Matcher dividematcher = divide.matcher(line);
        while(dividematcher.find()){
            System.out.println("TOKEN: " + dividematcher.group(0));
            System.out.println("SYMBOLIC NAME: DIVIDE");
        }
        
        String lparenpattern = "[(]";
        Pattern lparen = Pattern.compile(lparenpattern);
        Matcher lparenmatcher = lparen.matcher(line);
        while(lparenmatcher.find()){
            System.out.println("TOKEN: " + lparenmatcher.group(0));
            System.out.println("SYMBOLIC NAME: LPAREN");
        }
        
        String rparenpattern = "[)]";
        Pattern rparen = Pattern.compile(rparenpattern);
        Matcher rparenmatcher = rparen.matcher(line);
        while(rparenmatcher.find()){
            System.out.println("TOKEN: " + rparenmatcher.group(0));
            System.out.println("SYMBOLIC NAME: RPAREN");
        }
        
        String assignpattern = "[=]";
        Pattern assign = Pattern.compile(assignpattern);
        Matcher assignmatcher = assign.matcher(line);
        while(assignmatcher.find()){
            System.out.println("TOKEN: " + assignmatcher.group(0));
            System.out.println("SYMBOLIC NAME: ASSIGN");
        }
        
        String semipattern = "[;]";
        Pattern semi = Pattern.compile(semipattern);
        Matcher semimatcher = semi.matcher(line);
        while(semimatcher.find()){
            System.out.println("TOKEN: " + semimatcher.group(0));
            System.out.println("SYMBOLIC NAME: SEMI");
        }
    }
    
}