CODEWITHSUNDEEP
java
Devoted
Devoted

Reputation: 111

What is this error in my code? Trying to use userinput for variable and use switch statements

So I was trying to create this simple program were a user enters in a month (1-12) and then using switch statements tell them what month it is based upon what they entered. This is my code:

import java.util.Scanner;
class tests{
public static void main(String args[]){
    Scanner monthone = new Scanner(System.in);  
    Double month;
    System.out.println("What is the numerical value of the month? 1-12");
    System.out.print(monthone.nextLine());
    month = monthone.nextDouble();

    switch (month){
    case 1: 
    System.out.println("It's January");
    break;
    case 2: System.out.println("It's Feburary");
    break;
    case 3:
        System.out.println("It's March");
    break;
    case 4:
        System.out.println("It's April");
    break;
    case 5:
        System.out.println("It's May");
    break;
    case 6:
        System.out.println("It's June");
    break;
    case 7:
        System.out.println("It's July");
    break;
    case 8:
        System.out.println("It's August");
    break;
    case 9:
        System.out.println("It's September");
    break;
    case 10:
        System.out.println("It's October");
    break;
    case 11:
        System.out.println("It's November");
    break;
    case 12:
        System.out.println("It's December");
    break;
    default:
    System.out.println("I Don't know what month it is..");
    break;
    }

 }
}

Can anybody provide a solution or help? I tried using a Int for my variable as well but that failed... :s (Please detail answers.. I am here to learn not to be given an answer in a quick reply.)

Upvotes: 1

Views: 79

Answers (3)

Jops
Jops

Reputation: 22715

You've defined month as a Double.

Double month;

However, you can only switch on the following types:

  • byte (and its wrapper, Byte)
  • short (and its wrapper, Short)
  • char (and its wrapper, Character)
  • int (and its wrapper, Integer)
  • Enum Types
  • String

Therefore,

switch (month) {

is syntactically incorrect and will cause a compilation error.

A few other things are not right:

enter image description here

Here's the revised code:

public static void main(String args[]){

Scanner monthone = new Scanner(System.in);

int month;
System.out.println("What is the numerical value of the month? 1-12");    
//System.out.print(monthone.nextLine());    
month = monthone.nextInt();

switch (month){
case 1: 
System.out.println("It's January");
break;
case 2: System.out.println("It's Feburary");
break;

Upvotes: 6

Mike B
Mike B

Reputation: 5451

Make your month an int, remove this line: System.out.print(monthone.nextLine());, and change nextDouble to nextInt.

Upvotes: 1

PakkuDon
PakkuDon

Reputation: 1615

You're also consuming an extra line of input after prompting the user for a value. 

System.out.println("What is the numerical value of the month? 1-12");
System.out.print(monthone.nextLine()); // Remove this line

Upvotes: 1

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