Display the longest word in a sentence Bluej

This program was compiled and checked on Bluej
This program accepts a sentence from the user and displays the longest word and its length.

 SOURCE CODE :

import java.io.*;//package
class longestword//class name longest word
{
static String str,word;
static int l,b,a,counter,l2;
InputStreamReader read = new InputStreamReader(System.in);
BufferedReader br = new BufferedReader(read);
longestword()//default constructor
    {
        l=l2=0;
str="";
b=0;
counter=0;
    }
void inputword()throws IOException
{
System.out.println("Enter a sentence.....");
str=br.readLine();//store the sentence in str
l=str.length();//store the length of the sentence in l
str=str+" ";//add blank space to the sentece
}
void compute()throws IOException
    {
        for(a=0;a<=l;a++)
        {
            if(str.charAt(a)==' ')//to extract each word
            {
               
              
               l2=(str.substring(b,a)).length();//to store the length of a word
              
              
                if(l2>=counter)//compare length
                {
                   
                    word=str.substring(b,a);//to store the longest word
                    counter=l2;//store the frequency of the longest word
                }
               b=a+1;
               l2=0;
                  
            }
        }
    }
    void display()throws IOException
    {
        System.out.println("the longest word int the given sentence is..."+word);//to display the longest word
         System.out.println("frequency of the longest word is..."+counter);//display the frequency of the longest word
   
        }
        public static void main(String args[])throws IOException
        {
            longestword ob= new longestword();//creating object
            ob.inputword();
            ob.compute();
            ob.display();
        }
}
Output:


This program was compiled and checked on Bluej