Question

Question 2 (80 marks)

This programming assignment is divided into two parts:

(a) You will develop a Java class called StringSummary based on the UML class diagram depicted in Figure 1

String Summary -str: String - specialChars: int -digits: int - uppers: int -lowers: int +<<constructor>> Stringsummary (String: str) + summarize() +countDigits (s: String): int +countUppers (s: String): int +count Lowers (s: String): int +count SpecialChars (s: String): int +toString(): String +getStr(): String +setStr (s: String) Figure 1: UML class diagram of StringSummary class

A user will enter a string of sentence (Figure 2), and your program will provide a

summary of the sentence as shown in sample output Figure 3.

The class contains several private attributes:

• str stores the sentence input by user.

• specialChars stores number of special characters (i.e. non-digit and

non-letters: ;-!@ etc) in the input string.

• digits stores the number of digits (e.g. 0,1,2 ,etc.) in the input string.

• uppers stores the number of upper-case letters (e.g. A, B, C, etc.) in the

input string.

• lowers stores the number of lower-case letters (e.g. a, b, c etc.) in the input

string.

The constructor receives the input string from user. The other methods included:

• summarize accumulates all the information about the input sentence, e.g.

the number of digits, uppercase letters, lowercase letters, and special

characters. Hints: the method relies on other methods to get the needed

information.

• countDigits returns the number of digits in a string. It returns 0 if none.

• countUpper returns the number of upper-case letter in a string. It returns 0

if none.

• countLower returns the number of lower-case in a string. It returns 0 if none.

• countSpecialChars returns the number of special characters in a string. It

returns 0 if none.

• toString overrides the default method to return the formatted output (see

Figure 3).

• getStr an accessor (getter) method, which returns value of the variable str.

• setStr a mutator (setter) method used to control changes to variable str.

Guidelines:

• Implement the class StringSummary.

• There is no single solution to the implementation of each method. Be

creative and efficient.

• After completing the implementations, test your program using the driver

class, StringSummaryDriver (Appendix A). Update your program until

satisfy.

b) The second part of the programming assignment extends from (a). make a new

class called StringSummaryExtended. The class inherits the common properties

from StringSummary. It also included a new method known as mergeStrings

A user will enter two strings of sentences in sequence, one after another

(Figure 5). Then, your program will use the mergeStrings method to merge

/ concatenate both sentences. Finally, it displays a summary of the merged

sentence as shown in sample output Figure 6.

Guidelines:

• Implement the class StringSummaryExtended.

• There is no single solution to the implementation of the method. Be creative

and efficient.

• After completing the implementations, test your program using the driver

class, StringSummaryExtendedDriver (Appendix B). Update your program

until satisfy.

Answer 1

Answer:

I have written the Java Program based on your requirements.

The below code works perfectly and it has no-error.

Just SImple compile & run the below code.

I have also attached the Output screenshot that I got by running the below program.

Output:

C:\Users\Public>javac StringSummaryExtendedDriver.java C:\Users\Public>java StringSummaryExtendedDriver

Sentence Input 1 ? Enter a sentence: Hi Welcome ОК Cancel

х Sentence Input 2 ? Enter a second sentence to be merged. Mr.John !!! OK Cancel

x String Information i Summary: Read: Hi Welcome Mr.John !!! String length = 21 Number of digits = 0 Number of uppercase characters = 4 Number of lowercase characters = 11 Number of lowercase special characters = 6 OK

***********************************************************************************************************************************

Code:

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

import javax.swing.JOptionPane;

class StringSummary
{
   private String str;
   private int specialChars;
   private int digits;
   private int uppers;
   private int lowers;
  
   public StringSummary(String str)
   {
       this.str=str;
   }
  
   public int countDigits(String s)
   {
       int count=0;
      
       for(int i=0;i<str.length();i++)
       {
           if(Character.isDigit(str.charAt(i)))
           {
               count++;
           }
       }
      
       return count;
   }
  
   public int countUppers(String s)
   {
       int count=0;
      
       for(int i=0;i<str.length();i++)
       {
           if(Character.isUpperCase(str.charAt(i)))
           {
               count++;
           }
       }
       return count;
   }
  
   public int countLowers(String s)
   {
       int count=0;
      
       for(int i=0;i<str.length();i++)
       {
           if(Character.isLowerCase(str.charAt(i)))
           {
               count++;
           }
       }
       return count;
   }
  
   public int countSpecialChars(String s)
   {
       int count=0;
      
       for(int i=0;i<str.length();i++)
       {
           if(Character.isLetter(str.charAt(i)))
           {
               continue;
           }
           else if(Character.isDigit(str.charAt(i)))
           {
               continue;
           }
           else
           {
               count++;
           }
       }
       return count;
   }
  
   public String toString()
   {
       String temp="Summary: \nRead: "+str+"\nString length = "+Integer.toString(str.length())+"\nNumber of digits = "+Integer.toString(countDigits(str))+"\nNumber of uppercase characters = "+Integer.toString(countUppers(str))+"\nNumber of lowercase characters = "+Integer.toString(countLowers(str))+"\nNumber of lowercase special characters = "+Integer.toString(countSpecialChars(str));
       return temp;
   }
  
   public String getStr()
   {
       return str;
   }
  
   public void setStr(String s)
   {
       this.str=s;
       return;
   }
}
  
class StringSummaryExtended extends StringSummary
{
   public StringSummaryExtended(String str)
   {
       super(str);
   }
  
   public void mergeStrings(String s)
   {
       String temp=getStr();
       temp=temp+s;
       setStr(temp);
       return;
   }
}

public class StringSummaryExtendedDriver
{
   public static void main(String[] args)
   {
String str=JOptionPane.showInputDialog(null,"Enter a sentence:","Sentence Input 1",JOptionPane.QUESTION_MESSAGE);

String str2=JOptionPane.showInputDialog(null,"Enter a second sentence to be merged.","Sentence Input 2",JOptionPane.QUESTION_MESSAGE);
  
StringSummaryExtended summary=new StringSummaryExtended(str);     
  
   summary.mergeStrings(str2);
  
  
  
   JOptionPane.showMessageDialog(null,summary.toString(),"String Information",JOptionPane.INFORMATION_MESSAGE);
  
   }
}