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java's Introduction

初识Java

Java的基础知识

标签(空格分隔): Java环境


了解Java的各种环境

JDK (Java Development Kit,Java 开发工具)

这是JDK,JDK 是整个Java的核心,包括了Java运行环境(jre)、Java工具和Java基础类库。 除此之外还分为Java SE 、Java EE 、Java ME

JDK(Java Development Kit) 是 Java 语言的软件开发工具包(SDK)。

SE(J2SE),standard edition,标准版,是我们通常用的一个版本,从JDK5.0开始,改名为Java SE。

EE(J2EE),enterprise edition,企业版,使用这种JDK开发J2EE应用程序,从JDK 5.0开始,改名为Java EE。

ME(J2ME),micro edition,主要用于移动设备、嵌入式设备上的java应用程,从JDK 5.0开始,改名为Java ME。

JRE (Java Runtime Environment,Java运行环境)

运行JAVA程序所必须的环境的集合,包含JVM标准实现及Java核心类库。 JDK 它大于JRE,还包含了用于开发的工具。 有jre这个东西,就能运行java程序。

举例说明: 如果说虚拟机是操作系统,jre就是pc硬件。 java之所以能跨平台,就是在jre的层次上屏蔽了不同系统的差异。 jre可以单独下载安装 若下载的是jdk,jre自然也包含在了其中。你能发现你下载安装的jdk,有两个jre。 jdk目录下面的是 io流 等等标准的JDK jar包 还有一个jre文件夹下面是 java用来编译你所写的代码的工具。

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