package basics.valref;
public class Main {
	private Main() {}
	static public void main (String[] args) {
		//stdlib.Trace.graphvizShowSteps (true); stdlib.Trace.run ();
		int vi = 27;  MutInt ri = new MutInt(42);
		int vj = vi;  MutInt rj = ri;
		vi += 1;      ri.plus(1);
		System.out.println(vi);
		System.out.println(vj);
		System.out.println(ri);
		System.out.println(rj);
	}
}
final class MutInt {
	private int v;
	public MutInt(int v) { this.v = v; }
	public String toString() { return "MutInt(" + v + ")"; }
	public void plus(int z) { v += z; }
}