"System.in.read()" in Java

Question

I have a problem with this method:

public void runTransaction(){
   //Some calculations...
   wait();
   //Other calculations...
}

private static void wait(){
   try {
        System.out.println("Press <enter> to continue");
        System.in.read();
    } 
    catch (java.io.IOException ex) {
        System.out.println("Input error...");
    }
}

but the programm does not continue after pressing Enter. I'm using Ubuntu 12.04.

EDIT: the programm does print the message "Press to continue" but does not continue after that, it just waits for input.

I edited my post. The methode `runTransaction` is called several times inside the `main` methode. — user3019653, Nov 23 '13 at 15:40

score 0 · Answer 1 · answered Nov 23 '13 at 15:36

0

Does your code even compile? The wait method is public on the Object class, thus it can not be overridden as private. Try using a different method name, say waitForInput.

answered Nov 23 '13 at 15:36

MarkOfHall

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Yes the code does compile, the message is printed and it waits for input – user3019653 Nov 23 '13 at 15:40
the wait method is static, thus does not over-ride the Object.wait instance method. – Brandon Nov 23 '13 at 15:49

score 0 · Answer 2 · answered Nov 23 '13 at 15:37

0

This shouldn't even compile:

in.read() can throw an IOException, which you need to handle. (EDIT: Looks like you fixed this issue in your snippet.)
You can't name this method wait() since that hides Object's wait().

Once these errors are corrected, the code should work as expected.

answered Nov 23 '13 at 15:37

arshajii

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@user3019653 The snippet still shouldn't compile since the method's called `wait()`. – arshajii Nov 23 '13 at 15:42
It does compile, however i changed the name to `wait_enter`but got the same result – user3019653 Nov 23 '13 at 15:45
@user3019653 What Java version is this? – arshajii Nov 23 '13 at 15:46
`java -version` gives me: `java version "1.6.0_27" OpenJDK Runtime Environment (IcedTea6 1.12.6) (6b27-1.12.6-1ubuntu0.12.04.4) OpenJDK 64-Bit Server VM (build 20.0-b12, mixed mode)` – user3019653 Nov 23 '13 at 15:50

score 0 · Answer 3 · answered Jun 09 '14 at 17:57

0

Your code should run as expected if you have changed the name to wait_enter, you just need to make sure that you have clicked into the console before pressing enter so it registers the enter.

answered Jun 09 '14 at 17:57

LadyDi

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better add this as a comment rather than a answer. – Runcorn Jun 09 '14 at 18:27
As I just joined last week (notice the one rep point), I can't add comments to other peoples posts. – LadyDi Jun 09 '14 at 18:56

"System.in.read()" in Java

3 Answers3