and.java

来自「myassembler（大学作业）」· Java 代码 · 共 21 行

public class And extends Expression {
   private Expression firstOp, secondOp;
   
   public And(Expression f, Expression s) {
      firstOp = (Expression)f.clone();
      secondOp = (Expression)s.clone();
   }
   
   public int eval() {
      return firstOp.eval()*secondOp.eval();
   }
   
   public Object clone() {
      return new And(firstOp, secondOp);
   }
   
   public String toString() {
      return firstOp.toString()+secondOp.toString()+labelling()+"AND\n";
   }
}