Excercise 9-2

[Glen Iris]

I am trying to synchronize a block of code as detailed on page 738/739.

I cannot figure out how to access the String that I pass to my MyThreaddy method on lines 9,10 and 11 of the below code.

I wish to access the letters 'a','b' or 'c', depending on the thread on line 33/34.

public class SyncExample {

    public static void main(String args[]) {

        StringBuffer sb = new StringBuffer();

        MyThreaddy mt = new MyThreaddy(sb);

        Thread t1 = new Thread(mt, "a");
        Thread t2 = new Thread(mt, "b");
        Thread t3 = new Thread(mt, "c");

        t1.setName("t1");
        t2.setName("t2");
        t3.setName("t3");

        t1.start();
        t2.start();
        t3.start();
    }
}
class MyThreaddy extends Thread {

    StringBuffer s = new StringBuffer();

    public MyThreaddy(StringBuffer sb) {
        s = sb;
    }

    @Override
    public void run() {
        synchronized (this) {
            //what code can i use here?
            //sb.append(THREAD.GET_STRING????)
        }
    }
}

I hope somebody can help me. Thank you :-)

[Henry Wong]

Glen Iris wrote:I am trying to synchronize a block of code as detailed on page 738/739.

I cannot figure out how to access the String that I pass to my MyThreaddy method on lines 9,10 and 11 of the below code.

I wish to access the letters 'a','b' or 'c', depending on the thread on line 33/34.

public class SyncExample {

    public static void main(String args[]) {

        StringBuffer sb = new StringBuffer();

        MyThreaddy mt = new MyThreaddy(sb);

        Thread t1 = new Thread(mt, "a");
        Thread t2 = new Thread(mt, "b");
        Thread t3 = new Thread(mt, "c");

        t1.setName("t1");
        t2.setName("t2");
        t3.setName("t3");

        t1.start();
        t2.start();
        t3.start();
    }
}
class MyThreaddy extends Thread {

    StringBuffer s = new StringBuffer();

    public MyThreaddy(StringBuffer sb) {
        s = sb;
    }

    @Override
    public void run() {
        synchronized (this) {
            //what code can i use here?
            //sb.append(THREAD.GET_STRING????)
        }
    }
}

I hope somebody can help me. Thank you :-)

The second parameter to the constructor (in lines 9, 10, and 11) is for the name of the thread ... which you changed in line 13, 14,and 15.

Henry

[Glen Iris]

Thank you Henry.