Strong citation

First of all, I built a class M See when to call finalize Method

public class M {
@Override
protected void finalize() throws Throwable {

 System.out.println("~finalize");

super.finalize();
}
}

public class NormalReference {

public static void main(String[] args) throws IOException {
M m = new M();

m=null;
System.gc();
System.out.println(m);
System.in.read();
}
}