package com.cheng.zenofdesignpatterns.patterns.interpreter.calculator;
import java.util.HashMap;
/**
* 加法运算
*/
public class AddExpression extends SymbolExpression {
public AddExpression(Expression _left, Expression _right) {
super(_left, _right);
}
// 把左右两个表达式运算的结果加起来
@Override
public int interpreter(HashMap<String, Integer> var) {
return super.left.interpreter(var) + super.right.interpreter(var);
}
}