Sharing data between multiple threads

public class ThreadDemo4 {
Static Sharedata data=new sharedata ();
public static void Main (string[] args) {

New Thread (new Myrunnable1 (data)). Start ();
New Thread (new Myrunnable2 (data)). Start ();

}

}

Class Myrunnable1 implements runnable{
int i=50;

Private sharedata data;

Public Myrunnable1 (Sharedata data) {
This.data=data;
}

@Override
public void Run () {

while (i>0) {
i--;
Data.increment ();}
}

}

Class Myrunnable2 implements runnable{
int i=50;

Private sharedata data;

Public Myrunnable2 (Sharedata data) {

This.data=data;
}

@Override
public void Run () {
while (i>0) {
i--;
Data.decrement ();}

}

}

Class sharedata{
private int j=1;
public void increment () {
j + +;
System.out.println ("plus one" +j);

}
public void decrement () {

j--;
System.out.println ("Minus one get" +j);
}


}

Sharing data between multiple threads