接下来,我们需要通过反射机制来调用Java中的运算符对应的方法,进行实际的运算。 importjava.lang.reflect.Method;publicclassCalculator{publicdoubleevaluate(Stringexpression)throwsException{String[]tokens=expression.split("\\s+|(?<=\\()|(?=\\))|(?<=\\+)|(?=\\+)|(?<=\\*)|(?=\\*)|(?<=\...
{ // Declare the identifiers final String END = "="; String input; double num1 = 0; double num2 = 0; char operator = 0; boolean isOperator; Scanner scnr = new Scanner (System.in); System.out.println("Enter your numeric expression in the following form: "); System.out.println("...
import java.util.Stack; public class SimpleCalculator { /** * Evaluate an arithmetic expression, and return the result as a double. * * @param input * the expression to evaluate. * @return the evaluated result. */ public double evaluate(String input) { initialize(); this.scanner = new ...
String methord="80*(1+0.5)"; //test double d=s.evaluate(methord ); System.out.println(d); } } import java.util.Scanner; import java.util.Stack; public class SimpleCalculator { /** * Evaluate an arithmetic expression, and return the result as a double. * * @param input * the expr...
在所有情况下都这样做; 如果输入是运算符,我添加了一个isOperator布尔值来跳过运算。 完整代码如下: import java.util.Scanner;public class Calculator { // Compute an arithmetic expression public static void main(String[] args) { // Declare the identifiers final String END = "="; String input; ...
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一个典型的 Java 程序会创建许多对象,正如您所知,这些对象通过调用方法进行交互。通过这些对象之间的交互,程序可以执行各种任务,比如实现 GUI、运行动画,或者在网络上传输和接收信息。一旦一个对象完成了它被创建的工作,它的资源就会被回收以供其他对象使用。 这里有一个小程序,名为CreateObjectDemo,它创建了三个对象...
So where exactly can you use lambdas? You can use a lambda expression in the context of a functional interface. In a nutshell, afunctional interfaceis an interface that specifiesexactly oneabstract method. 可以看到lambda在用法上和匿名类是等价的 ...
本章的目的是向读者介绍使用设计模式和 Java 中可用的最新特性编写健壮、可维护和可扩展代码的基本概念。为了实现我们的目标,我们将讨论以下主题: 什么是编程范式? 命令式范式 命令式和函数式范式 面向对象范式 统一建模语言综述 面向对象设计原则 Java 简介 ...
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