Java Programming Reusable input method for an int Create a method called getInt.

Question

Java Programming

Reusable input method for an int

Create a method called getInt. It has four parameters:

Parameter 1 is a String, used for the input prompt (example: “Enter the number of objects ordered ”)

Paramete 2 is a type of our choice indicating 4 different range checking options:

1.No range checking

2.Only a lower bound range checking (inclusive)

3.Only an upper bound range check (inclusive)

4.Both lower and upper bounds checked (inclusive)

Parameters 3 and 4 are ints for the range lower and upper bounds, if used.

The method should use a dialog input box to get the int with the prompt provided. It should use a loop,

and a try - catch block, along with appropriate range checking, to ensure data validity. It then returns the

int. The prompt should be modified to include an error message if either the try - catch or the range checking flags an incorrect entry.

Explanation / Answer

PFA the solution with the following doubt as the follwoing are not clear from the question:

1. Where to use the loop ? (Please find the comments added over the method)

2. Since dialog box is mentioned, so is GUI required?

package new_Cheg_2;

import java.util.Scanner;

public class RangeCheck {
  
  
/*
* CONFUSION::
* Please be more clear on where the method needs the loop.
* Is it that the method will be called in loop with different choices ?
* OR
* The loop will continue until the user says so? But with the same choice? When user eneters any
* thing else other than Y or y then the int is returned and printed
*
* The constraint here is the method is supposed to return the entered int
*/
public int getInt(String inputPrompt, int choice, int lowerBound, int upperBound) throws Exception{

int returnedValue = 0;
boolean flag = true;

//loop for repeating the action till user says yes with same choice entered once
while(flag){
  
//Taking input from user
Scanner scanner = new Scanner(System.in);
System.out.println(inputPrompt);
int enteredNumber = scanner.nextInt();
  
//try-catch for validating the entry
try{
switch (choice) {
case 1:
returnedValue = enteredNumber;
break;
case 2:
if(enteredNumber>=lowerBound){
returnedValue = enteredNumber;
break;
}else{
throw new Exception("Lower bound violated!!");
}
case 3:
if(enteredNumber<=upperBound){
returnedValue = enteredNumber;
break;
}else{
throw new Exception("Upper bound violated!!");
}
case 4:
if((enteredNumber >= lowerBound) && (enteredNumber <= upperBound)){
returnedValue = enteredNumber;
break;
}else{
throw new Exception("Upper and Lower bounds violated!!");
}
default:
break;
}
}catch(Exception e){
throw new Exception(e.getMessage());
}/*finally {
if(scanner!=null){
scanner.close();
}
} */
System.out.println("Continue?? Y | N");
flag = scanner.nextLine().equals("Y") || scanner.nextLine().equals("y") ? true : false;
}
  
return returnedValue;
}
public static void main(String[] args) {
// TODO Auto-generated method stub
RangeCheck ob = new RangeCheck();
try{
System.out.println(ob.getInt("Please eneter", 2, 10, 50));
}catch(Exception e){
System.out.println(e.getMessage());
}   
}
}

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