Thread implementation Runnable in java example

import java.io.IOException;


public class First {

public static void main(String[] args) throws IOException {
// TODO Auto-generated method stub
Second obj = new Second();
Thread t = new Thread(obj);
t.start();
System.in.read();
obj.i = true;
}

}

public class Second implements Runnable{

public boolean i = false;

@Override

public void run() {

// TODO Auto-generated method stub

for(int j=0;j<2000000;j++){

try {

Thread.sleep(1000);

} catch (InterruptedException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

System.out.println("I am J " +j);

if(this.i)return;

}

}

}

output:-

I am J 0

I am J 1

I am J 2

I am J 3