printexpression.java

来自「myassembler（大学作业）」· Java 代码 · 共 20 行

public class PrintExpression extends Statement {
   private Expression toBeEvaluated;

   public PrintExpression(Expression e) {
      toBeEvaluated = (Expression)e.clone();
   }

   public void run() {
      System.out.println(toBeEvaluated.eval());
   }

   public Object clone() {
      return new PrintExpression(toBeEvaluated);
   }

   public String toString() {
      return toBeEvaluated.toString() + labelling()+"PRINT\n";
   }
}