Java Scanner Class - Unable to exit while loop

Question

I am trying to create a simple Scanner test program which will exit once the user inputs "Quit".

I have the variable being output to console and it will output Quit but when I am trying to compare the variable to the raw string it doesn't see it as true.

public static void main(String[] args) {

    String input;
    Scanner sc;

    System.out.println("Enter 'Quit' to exit.");

    while (true) {
        sc = new Scanner(System.in);
        input = sc.nextLine();
        if (input == "Quit") {
            break;
        }
        System.out.println(input);
    }

    sc.close();
}

score 1 · Accepted Answer · answered Mar 05 '14 at 04:42

1

You need to compare strings with equals()method not with == operator

if (input.equals( "Quit")) {
            break;
        }

answered Mar 05 '14 at 04:42

Nambi

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Thank you :D why does "==" not work? – TheShinyTuxedo Mar 05 '14 at 04:43
@TheShinyTuxedo == operator is used to compare the objects – Nambi Mar 05 '14 at 04:44
== will compare the references of the objects that's why it doesn't work to compare. – Gundamaiah Mar 05 '14 at 04:45

score 1 · Answer 2 · edited Mar 05 '14 at 04:45

1

Use always equals to compare the Strings.

== will compare the references.

edited Mar 05 '14 at 04:45

Subhrajyoti Majumder

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answered Mar 05 '14 at 04:44

Gundamaiah

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Java Scanner Class - Unable to exit while loop

2 Answers2