Question

Q.5.8 Write short Java code to display the following screen (no need to do it practically using a compiler, just basic coding to display the screen): Sample screenshot Input х ? Enter (1) to display the vowel count. Enter (2) to display the non vowel count. Enter (0) to exit. OK Cancel Q.5.9 Write a short Java code to display the following screen (no need to do it practically using a compiler, just basic coding to display the screen): Sample screenshot

PLEASE SOLVE THESE QUESTIONS. USE JAVA FOR CODING.

Answer 1

5.8

import javax.swing.JOptionPane;

public class Question5_8 {

   public static void main(String[] args) {

   // Java code to display an input dialog with a message, given title
       String choice = JOptionPane.showInputDialog("Enter {1} to display the vowel count.\nEnter {2} to display the non vowel count."
               + "\nEnter {0} to exit.");

}

}

Output:

Input X ? Enter {1} to display the vowel count. Enter {2} to display the non vowel count. Enter {0} to exit. OK Cancel

5.9

import javax.swing.JOptionPane;

public class Question5_9 {

   public static void main(String[] args) {

   // Java code to display a confirm dialog with a message given title and containing only yes/no buttons and showing question message icon

JOptionPane.showConfirmDialog(null, "Continue with the application? ","Continue? ",JOptionPane.YES_NO_OPTION,JOptionPane.QUESTION_MESSAGE);

}

}

Output:

Continue? Х ? Continue with the application? Yes No

5.10

• PRETEST loop is a loop structure in which the condition is tested first and if the condition evaluates to true then the statements within the loop are executed whereas a POSTTEST loop is a loop structure in which the statements within the loop are executed first and then the condition of the loop are evaluated.
• So in a POSTTEST loop, the loop statements are executed atleast once even if the condition is false in the first iteration whereas in PRETEST loop, if the condition is false in the first iteration then the loop statements are not executed at all.
• So a POSTTEST loop ensures that the loop statements are executed at least once but a PRETEST loop doesn't ensure that the loop statements are executed at least once.

Eg- PRETEST loop:

let i = 10; // set i to 10
// loop that prints the the number from 5 to 1
// since i = 10 > 5, hence the loop is not executed even once
while(i > 0 and i < 5)
{
   Display i;
   i = i - 1;
}

POSTTEST loop:
let i = 10; // set i to 10
// loop that prints the the number from 5 to 1
// the loop will be executed for i = 10, (the first iteration) since the condition is evaluated after the loop statements
// But when the while condition is executed, it returns false, hence the loop is exited.
do
{  
   Display i;
   i = i - 1;
}while(i > 0 and i < 5);

5.13

private String GenerateStars(int x)
{
   String stars = "";

// assuming SALES is an array defined within the class containing the method
   // if statement is used to return the number of stars based on the SALES amount at index x
   // if SALES amount at index x >= 100, then return a string containing 5 starts i.e *****
   // else return a string containing 2 stars i.e **
   if(SALES[x] >= 100){
       stars = "*****";
   }
   else{
       stars = "**";
   }
  
   return stars;
  
}