expression.java

来自「myassembler（大学作业）」· Java 代码 · 共 12 行

public abstract class Expression extends SuperStatement {
   //protected static Hashtable state = null;

   public Expression() {
     // if (state == null) state = Program.state;
   }

   public abstract int eval() throws ExecutionException;
   public abstract Object clone();
   public abstract String toString();
}