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Java的第八篇文章——Object类、String类和StringBuilder类

Java的第八篇文章——Object类、String类和StringBuilder类

第八章 Object类、String类和StringBuilder类学习目标了解Object类及其方法了解String类及其方法了解StringBuilder1.API的概念应用程序编程接口：每一个技术,官方都会定义出许多的功能，开发人员可以直接拿来使用(拿来主义)。API可以理解为Sun公司已经开...

Java中的Object类Date类Calendar类System类StringBuilder类

Object类java.lang.Object类是Java语言中的根类，即所有类的父类。它中描述的所有方法子类都可以使用。在对象实例化的时候，最终找的父类就是Object。如果一个类没有特别指定父类，那么默认则继承自Object类。日期时间类Date类java.util.Date`类表示特定的瞬...

大数据基础之java常用API一(Object类、String类、StringBuilder类)

大数据基础之java常用API一(Object类、String类、StringBuilder类)

常用APIObject类构造方法空参构造全参构造Object类: 是所有类的基类,或者说公共父类,每个类都直接或者间接的继承自Object,所以该类中有的方法,其他类中都有构造方法: public Object(); 所有类的构造方法中都会默认调用super() 会逐级调用直到调用到Object类...

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对象存储 OSS

对象存储（Object Storage Service，简称 OSS）是海量、安全、低成本、高可靠的云存储服务，具有与平台无关 RESTful API，能从互联网任何位置访问。OSS 提供标准、低频、归档等类型选择，全面优化存储成本。

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