JAVA PROGRAMMING: This is a java file from our textbook: PetFood.java Our teache

Question

JAVA PROGRAMMING:

This is a java file from our textbook: PetFood.java

Our teacher wants us to update this java file by:

Use dialog boxes to allow user input and messages to the user

Have code to check for invalid user inputs (e.g., empty strings, strings instead of numbers or vice-versa, negative numbers, floats instead of integers or vice-versa, etc.)

Also, he wants us to use a command that will accept input for lower and upper case for the switch statements - i believe it might be ignorecase , but I am not sure how to use it

*** THE LAST EXPERT DID NOT READ DIRECTIONS FULLY, I NEED DIALOG BOXES FOR INPUT AND FOR SWITCH STATEMENTS, A COMMAND SHOULD BE USED FOR UPPER AN LOWER CASE... I THINK IT IS IGNORE CASE -

import java.util.Scanner; // Needed for the Scanner class

/**
This program demonstrates a switch statement.
*/

public class PetFood
{
public static void main(String[] args)
{
String input; // To hold the user's input
char foodGrade; // Grade of pet food

// Create a Scanner object for keyboard input.
Scanner keyboard = new Scanner(System.in);
  
// Prompt the user for a grade of pet food.
System.out.println("Our pet food is available in " +
"three grades:");
System.out.print("A, B, and C. Which do you want " +
"pricing for? ");
input = keyboard.nextLine();
foodGrade = input.charAt(0);

// Display pricing for the selected grade.
switch(foodGrade)
{
case 'a':
case 'A':
System.out.println("30 cents per lb.");
break;
case 'b':
case 'B':
System.out.println("20 cents per lb.");
break;
case 'c':
case 'C':
System.out.println("15 cents per lb.");
break;
default:
System.out.println("Invalid choice.");
}
}
}

Explanation / Answer

Hi,

i have added input validation, ignore cases and inout dialog box as requested, added commentts too to help you understand. here is the code

import java.util.Scanner; // Needed for the Scanner class
import javax.swing.*;  

/**
This program demonstrates a switch statement.
*/
public class PetFood
{
public static void main(String[] args)
{
String input; // To hold the user's input
char foodGrade; // Grade of pet food
  
// Prompt the user for a grade of pet food via dialog box

String input=JOptionPane.showInputDialog(null,"Our pet food is available in three grades:A, B, and C. Which do you want pricing for?");   

if(input=="")//check for empty input
return;
foodGrade = input.charAt(0);
if(Character.isDigit(foodGrade))
{
System.out.println("invalid input");//checking for integer input
  
}
// Display pricing for the selected grade.
switch(Character.toLowerCase(foodGrade))//ignoring the case by making same case
{
case 'a':
System.out.println("30 cents per lb.");
break;
case 'b':
System.out.println("20 cents per lb.");
break;
case 'c':
System.out.println("15 cents per lb.");
break;
default:
System.out.println("Invalid choice.");
}
}
}

Thumbs up if this was helpful, otherwise let me know in comments

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