istruzione.java

mylanguage（大学作业）

//
//  Istruzione.java
//
//  Created by Dario Malchiodi on Jan 04 2006.
//  Copyright (c) 2006 DSI. All rights reserved.
//

import java.util.*;

public abstract class Istruzione {
    
    protected static Hashtable memoria = new Hashtable();
    
    protected static int numSpazi = 0;
    
    public Istruzione() {
    }
    
    protected String indenta() {
        StringBuffer s = new StringBuffer("");
        for(int i=0;i<numSpazi;i++) s.append(' ');
        return new String(s);
    }
    
    public abstract void esegui() throws ExecutionException;
    
    public abstract Object clone();
    
    public abstract String toString();
    
}