Asking user input for an integer in java

Question

I'm doing a basic java tutorial that is basically a mad libs program. The idea came up in the tutorial to try making sure a user is at least 13, but the example hard coded the age into the program. I wanted to try getting the age from the user, but at this point, my code gives me an error because a "string cannot be converted to an integer." Looking at my code, I don't see why it's giving me this error. Here is what I used:

int age = console.readLine("Enter your age:  ");
  if (age < 13) {
    //enter exit code
    console.printf("Sorry but you must be at least 13 to use this program.\n");
    System.exit(0);
  }

I have looked for other answers, but I didn't see any that I could discern from the specific problems they were trying to fix.

jnd · Accepted Answer · 2015-01-30 04:54:45Z

3

You should use

try{
    int age = Integer.parseInt(console.readLine("Enter your age:  "));
    // do stuff
} catch (NumberFormatException e) {
    // User did not enter a number
}

Java doesn't cast between the two automatically. The above method however will throw an exception when you don't enter a number which you will have to handle

answered Jan 30, 2015 at 4:54

jnd

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2 Comments

ddonche Over a year ago

That one gave me the following error: code error: cannot find symbol int age = Integer.valueof(console.readLine("Enter your age: ")); ^ symbol: method valueof(String) location: class Integer 1 error code

jnd Over a year ago

Not sure what error you are getting. But console.readline() returns a String which you will need to changed to an int. Perhaps this question will help you further: stackoverflow.com/questions/5585779/…

score 2 · Accepted Answer · 2015-01-30 05:07:14Z

2

You can use

Scanner input = new Scanner(System.in);
 int Age = input.nextInt();
  input.nextLine();

edited Jan 30, 2015 at 5:07

answered Jan 30, 2015 at 4:57

user3575886

1 Comment

Scary Wombat Over a year ago

do not forget to consume the <enter>

ddonche · Accepted Answer · 2015-01-30 05:06:59Z

0

Okay, I'm not sure if it's cool to answer your own question. I managed to get this to work, so in case someone else encounters the same problem. Here is the code that I used:

 String ageAsString = console.readLine("Enter your age:  ");
  int age = Integer.parseInt(ageAsString);
  if (age < 13) {
    //enter exit code
    console.printf("Sorry but you must be at least 13 to use this program.\n");
    System.exit(0);
  }

answered Jan 30, 2015 at 5:06

ddonche

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