BlueJ Program On String Class

Here is a BlueJ program on string for ICSE and ISC students:

Take a string from user and do the followings:

If the user enter ‘1’: Display all words in a different line given in a string

If the user enters ‘2’: Count how many four letter words are present in a string

import java.io.*;

class Series

{

BufferedReader br=new BufferedReader(new InputStreamReader(System.in));

String str,s;

int n;

public void disp()throws Exception

{

System.out.println("Enter the sentence:");

str=br.readLine();

System.out.println("Enter your choice (1 or 2):");

n=Integer.parseInt(br.readLine());

if(n==1)

split();

else

count();

}

void split()

{

while(true)

{

 n=str.indexOf(' ');

 if(n< 0)
break;

 s=str.substring(0,n);

 str=str.substring(n+1);

 System.out.println(s);

 }

  System.out.println(str);

  }

void count()

{

int c=0;

while(true)

{

 n=str.indexOf(' ');

 if(n< 0)
break;

 s=str.substring(0,n);

 str=str.substring(n+1);

if(s.length()==4)

c++;

 }

if(str.length()==4)

c++;

 System.out.println("Number of four letter words="+c);

  }

public static void main(String args[])throws Exception

{

Series tr=new Series();

tr.disp();

}

}

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