在我的 Mac 上使用多个版本的 Java

问题描述

我之前安装过 Java 16 并且正在使用它.现在我需要使用 Java 8.安装 Java 8 后，我意识到必须设置 JAVA_HOME 变量.我使用 macOS Big Sur 版本 11.5.2，我的终端使用 zsh shell.我关注了 youtube 上的一个视频，该视频告诉我执行以下步骤:

I had installed Java 16 before and was using it. Now I have a need to use Java 8. After installing Java 8 I realized that the JAVA_HOME variable has to be set. I use macOS Big Sur version 11.5.2 and my terminal uses zsh shell. I followed a video on youtube that told me to do the following steps:

1. 触摸.zshrc
2. 打开 -e .zshrc
3. 在 .zshrc 文件中写下以下命令

1. touch .zshrc
2. open -e .zshrc
3. inside .zshrc file write down the following commands

export JAVA_HOME='/Library/Java/JavaVirtualMachines/jdk1.8.0_301.jdk/Contents/Home'
export PATH = $JAVA_HOME/bin:$PATH

并保存文件

源代码 ~/.zshrc

但是当我在终端上运行第 4 步时，我似乎收到以下消息:

but when I run the step 4 on my terminal I seem to get the following message:

/Library/Java/JavaVirtualMachines/jdk1.8.0_301.jdk/Contents/Home not found

但我可以保证目录结构是存在的.这是我运行时的输出ls/Library/Java/JavaVirtualMachines/jdk1.8.0_301.jdk/Contents/Home输出

But I can guarantee that the directory structure is present.Here is the output when I runls /Library/Java/JavaVirtualMachines/jdk1.8.0_301.jdk/Contents/Homeoutput

推荐答案

使用 /usr/libexec/java_home 命令.在我的机器上，我有:

Use the /usr/libexec/java_home command. On my machine I have:

% /usr/libexec/java_home -V
Matching Java Virtual Machines (10):
    16.0.1 (x86_64) "AdoptOpenJDK" - "AdoptOpenJDK 16" /Library/Java/JavaVirtualMachines/adoptopenjdk-16.jdk/Contents/Home
    16.0.1 (x86_64) "GraalVM Community" - "GraalVM CE 21.1.0" /Library/Java/JavaVirtualMachines/graalvm-ce-java16-21.1.0/Contents/Home
    15.0.2 (x86_64) "AdoptOpenJDK" - "AdoptOpenJDK 15" /Library/Java/JavaVirtualMachines/adoptopenjdk-15.jdk/Contents/Home
    14.0.2 (x86_64) "AdoptOpenJDK" - "AdoptOpenJDK 14" /Library/Java/JavaVirtualMachines/adoptopenjdk-14.jdk/Contents/Home
    13.0.2 (x86_64) "AdoptOpenJDK" - "AdoptOpenJDK 13" /Library/Java/JavaVirtualMachines/adoptopenjdk-13.jdk/Contents/Home
    12.0.2 (x86_64) "AdoptOpenJDK" - "AdoptOpenJDK 12" /Library/Java/JavaVirtualMachines/adoptopenjdk-12.jdk/Contents/Home
    11.0.12 (x86_64) "GraalVM Community" - "GraalVM CE 21.2.0" /Library/Java/JavaVirtualMachines/graalvm-ce-java11-21.2.0/Contents/Home
    11.0.11 (x86_64) "AdoptOpenJDK" - "AdoptOpenJDK 11" /Library/Java/JavaVirtualMachines/adoptopenjdk-11.jdk/Contents/Home
    1.8.0_292 (x86_64) "AdoptOpenJDK" - "AdoptOpenJDK 8" /Library/Java/JavaVirtualMachines/adoptopenjdk-8.jdk/Contents/Home
    1.8.0_282+07 (x86_64) "GraalVM Community" - "GraalVM CE 21.0.0.2" /Library/Java/JavaVirtualMachines/graalvm-ce-java8-21.0.0.2/Contents/Home
/Library/Java/JavaVirtualMachines/adoptopenjdk-16.jdk/Contents/Home

使用以下命令获取 Java 1.8:

Use the following to get Java 1.8 home:

% /usr/libexec/java_home -v 1.8
/Library/Java/JavaVirtualMachines/adoptopenjdk-8.jdk/Contents/Home

如果以上所有内容都适用于您的设置，请将以下内容添加到您的~/.zshrc:

If all the above works for your set-up, add the following to your~/.zshrc:

export JAVA_HOME=$(/usr/libexec/java_home -v 1.8)

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