如何在MacOS上安装额外的java ?我安装了jdk8，运行正常。但是现在出于开发目的，我需要安装jdk7。当试图通过DMG文件安装旧版本时，我得到一个警告，已经安装了新的java版本，安装程序退出。
/usr/libexec/java_home -verbose
Matching Java Virtual Machines (1):
1.8.0_20, x86_64: "Java SE 8" /Library/Java/JavaVirtualMachines/jdk1.8.0_20.jdk/Contents/Home
/Library/Java/JavaVirtualMachines/jdk1.8.0_20.jdk/Contents/Home
除了这个，如何安装jdk7 ?
当前回答
我最近回复，我真的建议你用SDKMAN代替Homebrew。
使用SDKMAN，您可以轻松地在mac上安装不同版本的JAVA，并从一个版本切换到另一个版本。
你也可以使用SDKMAN的ANT, GRADLE, KOTLIN, MAVEN, SCALA等…
要在mac上安装新版本，可以运行命令sdk install java 15.0.0.j9-adpt
其他回答
在这个网站上可以找到 让我们从安装jEnv开始
Run this in the terminal brew install https://raw.github.com/gcuisinier/jenv/homebrew/jenv.rb Add jEnv to the bash profile if which jenv > /dev/null; then eval "$(jenv init -)"; fi When you first install jEnv will not have any JDK associated with it. For example, I just installed JDK 8 but jEnv does not know about it. To check Java versions on jEnv At the moment it only found Java version(jre) on the system. The * shows the version currently selected. Unlike rvm and rbenv, jEnv cannot install JDK for you. You need to install JDK manually from Oracle website. Install JDK 6 from Apple website. This will install Java in /System/Library/Java/JavaVirtualMachines/. The reason we are installing Java 6 from Apple website is that SUN did not come up with JDK 6 for MAC, so Apple created/modified its own deployment version. Similarly install JDK7 and JDK8. Add JDKs to jEnv. JDK 6: JDK 7: JDK 8: Check the java versions installed using jenv So now we have 3 versions of Java on our system. To set a default version use the command jenv local <jenv version> Ex – I wanted Jdk 1.6 to start IntelliJ jenv local oracle64-1.6.0.65 check the java version java -version
就是这样。我们现在有多个版本的java，我们可以很容易地在它们之间切换。jEnv还有其他一些特性，比如Gradle、Ant、Maven等的包装器，以及全局或本地设置JVM选项的能力。有关更多信息，请查看文档。
Jenv谈Mac Sierra:
如果安装后无法工作，请执行此错误修复以将Java可执行文件添加到路径
export PATH="$HOME/.jenv/shims:$PATH"
尽管eval "$(jenv init -)"可以做这个工作。原因是/bin文件夹已经不存在了，就像在它的主页上描述的那样，但是shim文件夹被用作/bin。
Make sure ~/。Jenv在那里 哪个java可以打印/库/… Jenv global 1.8 Jenv外壳1.8
最终，java给了你:
\用户- xxxx - jenv shims / java。
我按照下面的步骤链接- https://medium.com/@euedofia/fix-default- java-versionon -maven-on-mac-os-x-156cf5930078，它对我有效。
cd /usr/local/Cellar/maven/3.5.4/bin/
nano mvn
--Update JAVA_HOME -> "${JAVA_HOME:-$(/usr/libexec/java_home)}"
mvn -version
要查找可用的Java版本:
brew search java
要安装最新的稳定版本(截至今天有19个):
brew info java
brew install java
为了让系统Java包装器(例如:ide)找到最新的JDK，可以将其与以下符号链接:
sudo ln -sfn /opt/homebrew/opt/openjdk/libexec/openjdk.jdk /Library/Java/JavaVirtualMachines/openjdk.jdk
安装特定版本(11):
brew install java11
对于系统，Java包装器查找JDK 11:
sudo ln -sfn /opt/homebrew/opt/openjdk@11/libexec/openjdk.jdk /Library/Java/JavaVirtualMachines/openjdk-11.jdk
您可以在PATH中拥有其中一个OpenJDK版本。在~/.bash_profile中添加下列行之一
export PATH="/opt/homebrew/opt/openjdk/bin:$PATH
export PATH="/opt/homebrew/opt/openjdk@11/bin:$PATH
然后,
source ~/.bash_profile
我使用的是Mac OS X 10.9.5。这就是当我需要一个版本运行应用程序A，而应用程序B使用另一个版本时，我如何在我的机器上管理多个JDK/JRE。
我在网上得到一些帮助后创建了以下脚本。
#!bin/sh
function setjdk() {
if [ $# -ne 0 ]; then
removeFromPath '/Library/Java/JavaVirtualMachines/'
if [ -n "${JAVA_HOME+x}" ]; then
removeFromPath $JAVA_HOME
fi
export JAVA_HOME=/Library/Java/JavaVirtualMachines/$1/Contents/Home
export PATH=$JAVA_HOME/bin:$PATH
fi
}
function removeFromPath() {
export PATH=$(echo $PATH | sed -E -e "s;:$1;;" -e "s;$1:?;;")
}
#setjdk jdk1.8.0_60.jdk
setjdk jdk1.7.0_15.jdk
I put the above script in .profile file. Just open terminal, type vi .profile, append the script with the above snippet and save it. Once your out type source .profile, this will run your profile script without you having to restart the terminal. Now type java -version it should show 1.7 as your current version. If you intend to change it to 1.8 then comment the line setjdk jdk1.7.0_15.jdk and uncomment the line setjdk jdk1.8.0_60.jdk. Save the script and run it again with source command. I use this mechanism to manage multiple versions of JDK/JRE when I have to compile 2 different Maven projects which need different java versions.
