Java: If variable is empty (from user input); break; else continue the main method

Question

sorry if this is a silly question but I am looking for a way to break and start another iteration of the loop if the user's input is null. Here's my code:

while(true) {
    // Get the users input
    Scanner Input = new Scanner(System.in);
    System.out.println("Enter text:");
    String studentInfo = Input.nextLine();

    if (studentInfo == null) {
        System.out.println("Please enter valid infomation.");
        break;
    }
    continue;
}

After the break, I want it to go back to the while(true) and start again from there, by asking the user for an input again.

Thanks guys,

JT

Aw okay, I didn't know that, I'm just trying to stop my code from crashing when the user just hits enter with no actual input, thanks guys though! — jtaylor94
– jtaylor94, Commented Oct 7, 2013 at 19:58
It is the intrinsic nature of (infinite) loops to start another iteration when the previous has finished. So no need for a break there. — isnot2bad
– isnot2bad, Commented Oct 7, 2013 at 20:00
I know but what I'm trying to achieve was to not come up an error message when an empty input was used, instead just print a statement and carry on with the iteration. I have been answered now though so thank you! — jtaylor94
– jtaylor94, Commented Oct 7, 2013 at 20:03

Mena · Accepted Answer · 2013-10-07 19:58:41Z

4

Check for:

if (studentInfo.isEmpty()) {
    continue;
}

Remove the Scanner input = new Scanner(System.in); declaration from inside the while loop.

answered Oct 7, 2013 at 19:58

Mena

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