Java -- 错误: 找不到或无法加载主类 ReferenceCounting

　　javac.exe是编译软件，java.exe是执行软件

　　编写好代码如下：

package referencecounting;

//import static mindview.util.print.*;
class Shared{
    private int refcount = 0;
    private static long counter = 0;
    private final long id = counter++;
    public Shared(){
        //print("Creating " + this);
        System.out.println("Creating " + this);
    };
    public void addRef(){
        refcount++;
    }
    protected void dispose(){
        if( --refcount == 0 ){
            //print("Disposing " + this);
            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);
        //print("Creating " + this);
        this.shared = shared;
        this.shared.addRef();
    };
    public void dispose(){
        System.out.println("disposing " + this);
        //print("disposing " + this);
        shared.dispose();
    }
    public String toString(){
        return "Composing " + id;
    }    
}


public class ReferenceCounting{
    public static void main(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();
        }
    }
}