Question

Input a sentence from the user and count the number of times,the words “an” and “and” are present in
the sentence. Design a class Frequency using the description given below:
Class name:Frequency

Data Members/ variables :
text:stores the sentence
countand: to store the frequency of the word “and”
countan: to store the frequency of the word “an”
len: stores the length of the string

Member functions / methods:

Frequency( ) :constructor to initialize the instance variables

void accept(String n):to assign n to text,where the value of the parameter n should be in lower case.

void checkandfreq( ):to count the frequency of “and”
void checkanfreq( ):to count the frequency of “an”
void display( ):to display the number of”and” and “an” with appropriate messages.
Specify the class Frequency giving details of the constructor( ), void accept(String),void checkandfreq( ),void checkanfreq( ) and void display( ).Also define the main( ) function to create an object and call methods accordingly to enable the task.

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Code

				
					import java.util.Scanner;

public class Frequency
{
    String text;
    int countand,countan,len;
    public Frequency()
    { 
        text="";
        countand=0;
        countan=0;
    }
    
    public void accept(String n)
    {
        text=n;
        if(text.charAt(text.length()-1)!='.')
        {
             text=text+'.';
        }
        
        len=text.length();
    }
    
    public void checkandfreq()
    {
        int pos=0,i=0;
        char ch=' ';
        String b="";
        for(i=0;i< len;i++)
        {
            ch=text.charAt(i);
            if(ch==' '||ch=='.')
            {
                b=text.substring(pos,i);
                if(b.equals("and")==true)
                {
                    countand++;
                }
                pos=i+1;
            }
        }
    }
    public void checkanfreq()
    {	
        int pos=0,i=0;
        char ch=' ';
        String b="";
        for(i=0;i< len;i++)
        {
            ch=text.charAt(i);
            if(ch==' '||ch=='.')
            {	
                b=text.substring(pos,i);
                if(b.equals("an")==true)
                {
                    countan++;
                }
                pos=i+1;  
            }
        }
    }
    public void display()
    {	
        System.out.println("Number of and's="+countand);
        System.out.println("Number of an's="+countan);
    }   	
    
    public static void main()
    {
        Scanner sc=new Scanner(System.in);
        System.out.println("Enter a sentence in Lowercase");
        String n=sc.nextLine();
        Frequency ob1=new Frequency();
        ob1.accept(n);
        ob1.checkandfreq();
        ob1.checkanfreq();
        ob1.display();

    }
}