Java - StringBuilder not accessible after while loop in thread

Question

class myThread extends Thread {

myThread(Socket socket) {
    Scanner sc = new Scanner(socket);
}

public void run() {
    StringBuilder sb = new StringBuilder();
    try {
        while(sc.hasNext()) {
            sb.append(sc.next());
            sb.append(" ");
        }
        System.out.println(sb.toString());      

    } catch (Exception e) {
        System.out.println(e);      
    }
}

This code doesn't output anything. However, If I move the System.out.println(sb.toString()); into the while loop, it does. I have no idea why this is, but I need the code to output first AFTER the while loop is complete.

How would one go about to print the StringBuilder.toString() after the while-loop is complete?

I strongly suspect that the problem is that the loop isn't ending, because the socket isn't being closed. — Jon Skeet
– Jon Skeet, Commented Feb 23, 2016 at 22:02

Blake Yarbrough · Accepted Answer · 2016-02-23 22:04:50Z

5

The socket is probably never being closed, and the scanner is just blocking on hasNext().

Close the socket and it should finish.

edited Feb 23, 2016 at 22:04

Blake Yarbrough

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answered Feb 23, 2016 at 22:02

aglassman

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1 Comment

V.Vocor Over a year ago

Works now. Thank you!

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