package com.iluwatar; public class PlusExpression extends Expression { private Expression leftExpression; private Expression rightExpression; public PlusExpression(Expression leftExpression, Expression rightExpression) { this.leftExpression = leftExpression; this.rightExpression = rightExpression; } @Override public int interpret() { return leftExpression.interpret() + rightExpression.interpret(); } @Override public String toString() { return "+"; } }