JVM 之 JDK安装与配置

今天药忘吃喽~ 2023-07-18 06:53 98阅读 0赞

**目录**

1.准备JDK包

2.配置环境

3.JDK与JRE区别

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**通常我们使用的系统中无论是linux还是windows都不会自带JDK，需要我们安装与设置之后才能进行Java开发、**

### 1.准备JDK包 ###

**下载jdk：[https://www.oracle.com/java/technologies/javase-jdk8-doc-downloads.html][https_www.oracle.com_java_technologies_javase-jdk8-doc-downloads.html]**

### **2.配置环境** ###

**Windows:**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTM5MTkxNTM_size_16_color_FFFFFF_t_70][]   ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTM5MTkxNTM_size_16_color_FFFFFF_t_70 1][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTM5MTkxNTM_size_16_color_FFFFFF_t_70 2][]

在系统变量中添加变量JAVA\_HOME和CLASSPATH，设置对应值。编辑path变量，在最前面添加对应值。并测试命令是否可用。

**JAVA\_HOME：       //jdk安装目录  
CLASS\_PATH: .;%JAVA\_HOME%\\lib     //加载资源  
path：%JAVA\_HOME%\\bin；       //命令路径  
测试命令: Java,javac**

**Linux：**

**1.打开文件：**

vi /etc/profile

**2.在文件最后添加如下内容，内容要和自己安装的jdk路径匹配**

export JAVA\_HOME=/home/test/jdk/jdk1.8.0\_144

export CLASSPATH=.:$JAVA\_HOME/jre/lib/rt.jar:$JAVA\_HOME/lib/dt.jar:$JAVA\_HOME/lib/tools.jar

export PATH=.:$JAVA\_HOME/bin:$PATH

**测试命令: Java,javac**

### **3.JDK与JRE区别** ###

**JDK：**Java Development Kits

**JRE：**Java Runtime Environment

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTM5MTkxNTM_size_16_color_FFFFFF_t_70 3][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTM5MTkxNTM_size_16_color_FFFFFF_t_70 4][]

由上图可以看出，JDK中包含JRE，JRE包含JVM

**JRE是Java的运行环境，面向Java程序的使用者，而不是开发者。**

[https_www.oracle.com_java_technologies_javase-jdk8-doc-downloads.html]: https://www.oracle.com/java/technologies/javase-jdk8-doc-downloads.html
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