Longest Word In A Sentence | Write a Program In Java to Find the Longest Word In A Sentence.| ISC Computer Science | ICSE Computer Applications

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In this program, we write a program in java accept a sentence from the user and print the longest word in the sentence. 
Methods used: 
str.length(), str.substring(), str.indexOf().


Algorithm

  1.   Start
  2. in=""
  3. word=""
  4. longest=""
  5. Print "Enter a sentence"
  6. Read in
  7. in=in+" "
  8. If in.equals("")==false, go to step 9 or else go to step 14
  9. word=in.substring(0, in.indexOf(' '))
  10. If word.length()>longest.length(), go to step 11 or else go to step 12
  11. longest=word
  12. in=in.substring(in.indexOf(' ')+1, in.length())
  13. Go to step 8
  14. Print "The longest word is "+longest
  15. Stop

Program

Buffered Reader


import java.io.*;
class Longest
{
    String in, word="", longest="";
    
    void accept() throws IOException
    {
        BufferedReader br=new BufferedReader (new InputStreamReader (System.in));
        System.out.println("Enter a sentence");
        in=br.readLine();
        in=in+" ";
    }
    
    void longest()
    {
        while(in.equals("")==false)
        {
            word=in.substring(0, in.indexOf(' '));
            if(word.length()>longest.length())
            {
                longest=word;
            }
            in=in.substring(in.indexOf(' ')+1, in.length());
        }
    }
    
    void display()
    {
        System.out.println("The longest word is "+longest);
    }
    
    void main() throws IOException
    {
        accept();
        longest();
        display();
        }
}

Scanner


import java.util.*;
class Longest
{
    String in, word="", longest="";
    
    void accept()
    {
        Scanner sc=new Scanner (System.in);
        System.out.println("Enter a sentence");
        in=sc.nextLine();
        in=in+" ";
    }
    
    void longest()
    {
        while(in.equals("")==false)
        {
            word=in.substring(0, in.indexOf(' '));
            if(word.length()>longest.length())
            {
                longest=word;
            }
            in=in.substring(in.indexOf(' ')+1, in.length());
        }
    }
    
    void display()
    {
        System.out.println("The longest word is "+longest);
    }
    
    void main() 
    {
        accept();
        longest();
        display();
        }
}

Documentation

Variable Description

 Data TypeVariable NameDescription
 Stringin To store the sentence from the user 
 Stringword To store a word from the sentence 
 Stringlongest To store the longest word of the sentence 

Method Description

 Return TypeMethod NameDescription
 voidaccept() To accept a sentence from the user 
 voidlongest() To find the longest word in a sentence 
 void display() To display the longest word 
 voidmain() To act as an entry gateway for the compiler. 

Output

Image is Unavailable




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