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【Java从入门到精通】Java Character 类

Java Character 类 Character 类用于对单个字符进行操作。 Character 类在对象中包装一个基本类型 char 的值实例然而，在实际开发过程中，我...

【Java从入门到精通】Java Number & Math 类

Java Number & Math 类一般地，当需要使用数字的时候，我们通常使用内置数据类型，如：byte、int、long、double 等。实例然而，在实际开发过程中...

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【Java从入门到精通】Java对象和类(2)

Java 包包主要用来对类和接口进行分类。当开发 Java 程序时，可能编写成百上千的类，因此很有必要对类和接口进行分类。 import 语句在 Java 中，如果给出一个完整的限定名，包括包名、类名，那么 Java 编译器就可以很容易地定位到源代码或者类。import 语句就是用来提供一个合理...

【Java从入门到精通】Java对象和类（1）

Java 对象和类 Java作为一种面向对象语言。支持以下基本概念：本节我们重点研究对象和类的概念。对象：对象是类的一个实例（对象不是找个女朋友），有状态和行为。例如，一条狗是一个对...

从零开始学习 Java：简单易懂的入门指南之File类（二十九）

1. File类1.1 概述java.io.File 类是文件和目录路径名的抽象表示，主要用于文件和目录的创建、查找和删除等操作。1.2 构造方法public File(String pathname) ：通过将给定的路径名字符串转换为抽象路径名来创建新的 File实例。public File(St...

从零开始学习 Java：简单易懂的入门指南之可变参数及Collections类（二十五）

1. 可变参数在JDK1.5之后，如果我们定义一个方法需要接受多个参数，并且多个参数类型一致，我们可以对其简化.格式：修饰符返回值类型方法名(参数类型... 形参名){ }底层：其实就是一个数组好处：在传递数据的时候，省的我们自己创建数组并添加元素了，JDK底层帮我们自动创建数组并添加元素了...

Java从入门到精通-类和对象（一）

0. 类和对象1. 面向对象概述Java面向对象编程（Object-Oriented Programming，OOP）是一种强大的编程范式，它基于对象、类、封装、继承和多态等核心概念。这种编程范式使得代码更加模块化、可维护、可重用和可扩展。1.1 对象和类在Java中，一切都是对象。对象是程序中的基...

从零开始学习 Java：简单易懂的入门指南之JDK8时间相关类（十八）

JDK8时间相关类JDK8时间相关类1.1 ZoneId 时区1.2 Instant 时间戳1.3 ZoneDateTime 带时区的时间1.4DateTimeFormatter 用于时间的格式化和解析1.5LocalDate 年、月、日1.6 LocalTime 时、分、秒1.7 LocalDat...

从零开始学习 Java：简单易懂的入门指南之时间类（十七）

时间类第一章 Date类1.1 Date概述1.2 Date常用方法第二章 SimpleDateFormat类2.1 构造方法2.2 格式规则2.3 常用方法2.4 练习1(初恋女友的出生日期)2.5 练习2(秒杀活动)第三章 Calendar类3.1 概述3.2 常用方法3.3 get方法示例3....

从零开始学习 Java：简单易懂的入门指南之API、String类（八）

常用API1.API1.1API概述1.2如何使用API帮助文档2.String类2.1String类概述2.2String类的特点2.3String类的构造方法2.4创建字符串对象两种方式的区别2.5字符串的比较2.5.1==号的作用2.5.2equals方法的作用2.6用户登录案例2.6.1案例...

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