How to exit loop with ENTER

Question

How do I exit this loop when user presses ENTER. This is part of the codes I have done. I am having problems in how to code when user presses ENTER.

static String[] itemList = new String[10];

do {
    System.out.print("Enter item (press ENTER to exit) " + (count + 1) + ":  ");
    String item = input.next();
    itemList[count] = item;
    if (item == "")
        count = itemList.length;

@kumar can you please explain? sorry I just started learning programming & this is for my project — cjmalacaman, Feb 11 '14 at 09:41
Not sure but can try Pattern p = Pattern.compile("\n"); do{ String data = scan.next(); Matcher m = p.matcher(data); boolean b = m.matches(); if(b) break; }// can try something similar to this — kumar, Feb 11 '14 at 10:09
possible duplicate of [How do I compare strings in Java?](http://stackoverflow.com/questions/513832/how-do-i-compare-strings-in-java) — Bernhard Barker, Mar 07 '14 at 18:27

score 3 · Answer 1 · answered Feb 11 '14 at 09:37

3

You are comparing Strings using == not .equals().

This compares the pointer to the String, not the contents of the String.

answered Feb 11 '14 at 09:37

Tim B

40,716
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1

He means you have to use `String#equals` to compare strings, not `==`: `item.equals("")`. `==` compares references, not content. Please read some Java tutorial about strings. – m0skit0 Feb 11 '14 at 09:40
@m0skit0 sorry i still don't quite understand. i just started learning programming for my course – cjmalacaman Feb 11 '14 at 09:43

score 0 · Answer 2 · answered Feb 11 '14 at 09:42

Scanner scanner = new Scanner(System.in);
String readString = scanner.nextLine();
while(readString!=null)
{
    System.out.println(readString);
    if(readString.equals(""))
        System.out.println("Read Enter Key.");
    if(scanner.hasNextLine())
        readString = scanner.nextLine();
    else
        readString = null;
}

score 0 · Answer 3 · answered Feb 11 '14 at 09:44

0

Check the condition before entering into loop. For example:

boolean statusIsNotReady = true;
while(statusIsNotReady) {
    // do your fty;
    if(someCondition) {
        statusIsNotReady = false; // If the status changed
    }
}

answered Feb 11 '14 at 09:44

Ashot Karakhanyan

2,804
3
23
28

kumar · Answer 4 · 2014-02-11T10:49:37.560

public class SampleInputReader{
    public static void main(String args[]){

    String[] itemList = new String[10];
            int count = 0;
            Scanner keyboard = new Scanner(System.in);
            String data = "";

            do{
                    System.out.print("Enter item (press ENTER to exit) " + (count + 1)+ ":  ");
                    data = keyboard.nextLine();
                    if(data.isEmpty())
                        break;

                      itemList[count] = data;
                      count++;
            }while(true); 

            for(int i = 0; i< itemList.length; i++)
                System.out.println(itemList[i]);

}
}

But instead of Array i suggest you to use Arraylist.

How to exit loop with ENTER

4 Answers4

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