Multi-threaded shared data

public class Multithreadsharedata {


private static ShareData1 data1 = new ShareData1 ();

public static void Main (string[] args) {
ShareData1 data2 = new ShareData1 ();
New Thread (New MyRunnable1 (DATA2)). Start ();
New Thread (New MyRunnable2 (DATA2)). Start ();

Final ShareData1 data1 = new ShareData1 ();
New Thread (New Runnable () {
@Override
public void Run () {
Data1.decrement ();

}
). Start ();
New Thread (New Runnable () {
@Override
public void Run () {
Data1.increment ();

}
). Start ();


}


}

Class MyRunnable1 implements runnable{
Private ShareData1 data1;
Public MyRunnable1 (ShareData1 data1) {
This.data1 = data1;
}
public void Run () {
Data1.decrement ();

}
}

Class MyRunnable2 implements runnable{
Private ShareData1 data1;
Public MyRunnable2 (ShareData1 data1) {
This.data1 = data1;
}
public void Run () {
Data1.increment ();
}
}


Class ShareData1/*implements runnable*/{
/* Private int count = 100;
@Override
public void Run () {
TODO auto-generated Method Stub
while (true) {
count--;
}
}*/


private int j = 0;
public synchronized void increment () {
j + +;
}

Public synchronized void decrement () {
j--;
}
}