CODEWITHSUNDEEP
javaswitch-statement
Dan
Dan

Reputation: 55

How to match multiple input values in a switch case statement?

What piece of code do I need to make it so that if the user enters 7, 8, or 9 dogs; it will still output the message in case 6?

int dogs;

dogs = Integer.parseInt(JOptionPane.showInputDialog("How many dogs do you have?"));

switch (dogs)
{
           ...
           ...
           ...
case 4: JOptionPane.showMessageDialog(null,"Four dogs is too many."); break;

case 5: JOptionPane.showMessageDialog(null,"Five dogs means you're a crazy person."); break;

case 6: JOptionPane.showMessageDialog(null,"That is totally unbelieveable.");

default: JOptionPane.showMessageDialog(null,"Invalid input.");

} // end switch

Upvotes: 1

Views: 3316

Answers (4)

Augustus Francis
Augustus Francis

Reputation: 2670

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

public class DogCheck {
 public static void main(String[] args) {
  int dogs;
  Scanner input = new Scanner(System.in);
  System.out.println("Enter Number of Dogs :");
  dogs=input.nextInt();
  if (dogs < 0)
      System.out.println("WoW! Aliens has arrived...")
  else 
  switch(dogs) {
  case 4: JOptionPane.showMessageDialog(null,"Four dogs is too many."); break;
  case 5: JOptionPane.showMessageDialog(null,"Five dogs means you're a crazy `person."); break;`
  default:
    JOptionPane.showMessageDialog(null,"That is totally unbelieveable.");
    break;
  }
 }
}

Upvotes: 0

BigMike
BigMike

Reputation: 6873

case 6:
case 7:
case 8:
  JOptionPane.showMessageDialog(null,"That is totally unbelieveable.");
  break;

This will do the job.

However I'd change it to:

case 4: JOptionPane.showMessageDialog(null,"Four dogs is too many."); break;
case 5: JOptionPane.showMessageDialog(null,"Five dogs means you're a crazy person."); break;
default:  JOptionPane.showMessageDialog(null,"That is totally unbelieveable.");break;

This will eliminate the Invalid Output message, but will work for each and every number > 5, but i think that is acceptable, since the value of dogs comes out from an Integer.parseInt() call. If content is invalid an exceptin will be thrown there, and the Invalid Input message can be showed inside the exception handler and like wise an exception can be thrown if dogs is negative.

This has the advantage that will work for every number of dogs. If in need to manage a different error message, it will be enough just add the specific case branch.

int dogs;

try {
     dogs = Integer.parseInt(JOptionPane.showInputDialog("How many dogs do you have?"));
     if (dogs < 0) {
         throw new Exception("Negative dog is impossible!");
     }
    switch (dogs)
    {
           ...
           ...
           ...
    case 4: JOptionPane.showMessageDialog(null,"Four dogs is too many."); break;

    case 5: JOptionPane.showMessageDialog(null,"Five dogs means you're a crazy person."); break;

    default: JOptionPane.showMessageDialog(null,"That is totally unbelieveable.");break;
    } 
} catch (Exception e) {
    JOptionPane.showMessageDialog(null,"Invalid input.");
}

Upvotes: 3

Duncan Jones
Duncan Jones

Reputation: 69369

Check for an invalid number, then just use a default clause:

if (dogs < 0) {
  JOptionPane.showMessageDialog(null,"Invalid input.");
} else {
  switch(dogs) {
    // ...
  case 5: 
    JOptionPane.showMessageDialog(null,"Five dogs means you're a crazy person.");
    break;
  default:
    JOptionPane.showMessageDialog(null,"That is totally unbelieveable.");
    break;
  }
}

Upvotes: 4

Juned Ahsan
Juned Ahsan

Reputation: 68715

Simply add cases for 7,8,9 with 6 

case 6: 
case 7:
case 8:
case 9:
JOptionPane.showMessageDialog(null,"That is totally unbelieveable."); 
break;

Upvotes: 3

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