DouKaku? 6348 horiuchi: Javaでは、STDINがバッファされて...(出力の一時停止と再開)

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Javaでは、STDINがバッファされてしまうため Enterが押下されるまで読み込めません。そのため、下記のコードでは p + Enterと、q + EnterでSuspendとQuitします。

public class Sample179 implements Runnable {

    private final Object lockObj_ = new Object();

    private boolean isSuspend_ = false;

    public boolean getSuspend() {
        synchronized (lockObj_) {
            return isSuspend_;
        }
    }
    public void changeSusupend() {
        synchronized (lockObj_) {
            isSuspend_ = !isSuspend_;
            if (isSuspend_) {
                lockObj_.notifyAll();
            }
        }
    }

    @Override
    public void run() {
        try {
            while (Thread.currentThread().isAlive()) {
                synchronized (lockObj_) {
                    while (getSuspend()) {
                        lockObj_.wait(1000);
                    }
                }
                System.out.print('a');
                Thread.sleep(1000);
            }
        } catch (InterruptedException ex) {
            ex.printStackTrace();
        }
    }


    public static void main(String[] args) {
        final Sample179 sample = new Sample179();
        Thread thread = new Thread(sample);
        thread.setDaemon(true);
        thread.start();
        try {
            while (true) {
                char c = (char) System.in.read();
                if (c == 'q') break;
                if (c == 'p') {
                    sample.changeSusupend();
                }
            }
        } catch (IOException ex) {
            ex.printStackTrace();
        }
    }
}

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