expression.java

OOAD,加油

package ooad.composite;

public class Expression extends Node {
	private Node n1,n2;
	private Operator op;
	
	public Expression(Node n1,Node n2,Operator op){
		this.n1=n1;
		this.n2=n2;
		this.op=op;
	}
	
	public double getValue() {
		return op.compute(n1, n2);
	}

}