Implement Simple Lexical Analyzer to count number of keywords,operators,symbols and delimiters

import java.util.*;
import java.io.*;

class LexicalAnalyzer

{
    public static void main(String args[]) throws Exception
    {
        int kc=0,oc=0,sc=0,dc=0;
        File f=new File("input.txt");
     

        FileReader fi=new FileReader(f);
        BufferedReader br=new BufferedReader(fi);
        String temp;
        String words[];

        while((temp=br.readLine())!=null)
        {
            //temp=br.readLine();
            words=temp.split("[\\s ,;\\(\\)\\{\\}]"); //delimiters are whitspace characters , ; ( ) { }
            //For reference on regular expression for split method see
// http://docs.oracle.com/javase/1.4.2/docs/api/java/util/regex/Pattern.html#sum

dc+=words.length-1;
            for(int i=0;i<words.length;i++)
                if(isKeyword(words[i])==true)
                    kc++;
                else if(isOperator(words[i])==true)
                    oc++;
                else
                    sc++;
        }

            System.out.println("Keywords:"+kc);
            System.out.println("Operators:"+oc);
            System.out.println("Symbols:"+sc);
            System.out.println("Delimiters:"+dc);
           


 
    }


    //implement boolean returning methods like these below to detect anything
    public static boolean isKeyword(String x)
    {
        String keywords[]={"auto","break","case","char","const","continue","default","do","double","else","enum","extern","float","for","goto","if","int","long","register","return","short","signed","sizeof","static","struct","switch","typedef","union","unsigned","void","volatile","while"};
        for(int i=0;i<keywords.length;i++)
            if(x.equals(keywords[i])==true)
                return true;
        return false;
    }
    public static boolean isOperator(String x)
    {
        String operator[]={"--","++","~","+","-","*","/","^","&","%","!","<",">","|","="};
        for(int i=0;i<operator.length;i++)
            if(x.equals(operator[i])==true)
                return true;
        return false;
    }

}

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input.txt

-----------------

int main ()

{

int a,b,c;

float x,y;

a = a + b;

}

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Output:

----------------

Keywords:3

Operators:2

Symbols:9

Delimiters:8

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