我用 Sudo rm /usr/bin/java

我下载并安装了最新的Java SE Runtime Environment: http://www.oracle.com/technetwork/java/javase/downloads/index.html

sudo ln -s /Library/Java/JavaVirtualMachines/jdk1.8.0_31.使用实例jdk/Contents/Home/jre/bin/java /usr/bin/java不适合我，因为我得到了操作不允许。El Capitan现在以“无根”模式保护某些系统目录(又名系统完整性保护)。它适用于macOS Sierra，可能在可预见的未来也适用于新的macOS版本。

因为你需要在Java Preferences窗格中输入，并以这样的方式只标记JVM 7:

要在Mac OS X中轻松快速地打开Java首选项窗格，您可以简单地使用⌘+SPACE调用spotlight，并键入系统首选项，它将显示在窗口的最后一行。

更新

brew tap adoptopenjdk/openjdk
brew cask install adoptopenjdk/openjdk/adoptopenjdk8

https://stackoverflow.com/a/28635465

旧版本 对我来说，最简单、最干净的方法是使用下面描述的自制程序安装Java:

https://stackoverflow.com/a/28635465

brew update
brew cask install java

在我的案例中，问题是Oracle将它安装到与我习惯的位置不同的位置。

从Oracle下载:http://java.com/en/download/mac_download.jsp?locale=en

Verify that it's installed properly by looking in System Prefs: Command-Space to open Spotlight, type 'System Preferences', hit enter. Click Java icon in bottom row. After the Java Control Panel opens, click 'Java' tab, 'View...', and verify that your install worked. You can see a 'Path' there also, which you can sub into the commands below in case they are different than mine. Verify that the version is as you expect (sub in your path as needed): /Library/Internet\ Plug-Ins/JavaAppletPlugin.plugin/Contents/Home/bin/java -version Create link from /usr/bin/java to your new install sudo ln -fs /Library/Internet\ Plug-Ins/JavaAppletPlugin.plugin/Contents/Home/bin/java /usr/bin/java Sanity check your version: java -version

我所做的

export JAVA_HOME=`/usr/libexec/java_home`

这解决了我的Java 8问题。

之前:

java version "1.6.0_31"
Java(TM) SE Runtime Environment (build 1.6.0_31-b04)
Java HotSpot(TM) 64-Bit Server VM (build 20.6-b01, mixed mode)

后:

java version "1.8.0_05"
Java(TM) SE Runtime Environment (build 1.8.0_05-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.5-b02, mixed mode)

您可以在终端执行以下命令:

export PATH="/Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home/bin:$PATH"

这将用新java替换旧java。