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class Shared{
private int refcount = 0;
private static long counter = 0;
private final long id = counter++;
public Shared() {
System.out.println("Creating "+this);
}
public void addRef() {
refcount++;
}
protected void dispose() {
if(--refcount == 0)
System.out.println("Disposing "+this);
}
public String toString() {
return "Shared "+id;
}
}
class Composing{
private Shared shared;
private static long counter = 0;
private final long id = counter++;
public Composing(Shared shared) {
System.out.println("Creating "+this);
this.shared = shared;
this.shared.addRef();
}
protected void dispose() {
System.out.println("disposing "+this);
shared.dispose();
}
public String toString() {
return "Composing "+id;
}
}
public class ReferenceCounting {
public static void mian(String[]args) {
Shared shared = new Shared();
Composing [] composing = {new Composing(shared),new Composing(shared),new Composing(shared),new Composing(shared),new Composing(shared),};
for(Composing c:composing)
c.dispose();
}
}