How to re run java code after user inputs data

Question

Hey I have a basic java 'app' showing if people are an adult or teen etc.. I am starting out with java and I can't find how to make it so after a user has input an age, and the string of what they are classified as shows I would like it to re run the whole thing again so someone else can have a go. I have been looking into doing a loop but that hasn't worke dout for me.. Here is the code:

    public static void main(String[] args)
{
    //Declare local variables
    int age;
    Scanner in = new Scanner(System.in);

    //Prompt user for Age
    System.out.print("Enter Age: ");
    age = in.nextInt();

    if(age > 17)
    {
        System.out.println("This persons age indicates that they an adult");
    }
    else if (age > 12)
    {
        System.out.println("This persons age indicates that they are a teenager");
    }
    else if (age >= 0)
    {
        System.out.println("This persons age indicates that they are a child");
    }
    else
    {
        System.out.println("That age is invalid");
    }

    //Close input
    in.close();
}

Any help would be greatly appreciated. I am sure it is super simple and I have missed something.

Put all the content of main into a separate method and call it as many times as you wish. — Nir Alfasi
– Nir Alfasi, Commented Mar 13, 2015 at 3:47
@allieluu This code should be refactored - and you suggest to add more complexity into it instead... — Nir Alfasi
– Nir Alfasi, Commented Mar 13, 2015 at 3:48
@alfasin I only wanted to clarify what specifically he tried. If it was something as simple as not putting all of the necessary code in the loop, I would be able to help better. It wasn't intended to be a suggestion yet. — allieluu
– allieluu, Commented Mar 13, 2015 at 3:51
Also, don't close in here, because that closes System.in. (Sometimes you need to close streams, and sometimes you don't. You should close a lot of things, but not System.in) — Stack Exchange Broke The Law
– Stack Exchange Broke The Law, Commented Mar 13, 2015 at 3:55

champfish · Accepted Answer · 2015-03-13 04:02:24Z

2

You can put it in a loop such as

 public static void main(String[] args)
{
    //Declare local variables
    int age;
    Scanner in = new Scanner(System.in);
while(true){
    //Prompt user for Age
    System.out.print("Enter Age: ");
        age = in.nextInt();

        if(age > 17)
        {
            System.out.println("This persons age indicates that they an adult");
        }
        else if (age > 12)
        {
            System.out.println("This persons age indicates that they are a teenager");
        }
        else if (age >= 0)
        {
            System.out.println("This persons age indicates that they are a child");
        }
        else
        {
            System.out.println("That age is invalid");
        }
}

        //Close input
        in.close(); //Note that this happens outside the loop
    }

or put the needed code in a method

public static void ageCheck()
{
  //code that is currently in main method
}

it would be called from the main method by

this.ageCheck();

answered Mar 13, 2015 at 4:02

champfish

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1 Comment

champfish Over a year ago

You might need the code "in.nextLine()" at the end of the while loop.

Joe · Accepted Answer · 2015-03-13 04:03:05Z

0

You could do a while(true) loop to run forever

answered Mar 13, 2015 at 4:03

Joe

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Comments

AJ. · Accepted Answer · 2015-03-13 05:04:48Z

0

You can call your main() recursively

After this in.close();statement just call your main() like this

 in.close();
  main(null);

But you must put some conditions when to stop the execution of you program.

answered Mar 13, 2015 at 5:04

AJ.

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