javac 在 ubuntu 终端中不起作用
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javac does not work in ubuntu terminal
提问by Prasanna
When I try to compile a java program with javac, I get an error:
当我尝试使用 编译 java 程序时javac，出现错误：
The program 'javac' can be found in the following packages:
* default-jdk
* ecj
* gcj-4.6-jdk
* gcj-4.7-jdk
* openjdk-7-jdk
* openjdk-6-jdk
Try: sudo apt-get install <selected package
When I try java -version, it says,
当我尝试 java -version 时，它说，
java version "1.7.0_21"
OpenJDK Runtime Environment (IcedTea 2.3.9) (7u21-2.3.9-1ubuntu1)
OpenJDK 64-Bit Server VM (build 23.7-b01, mixed mode)
When I try which java I get /usr/bin/java
当我尝试使用哪个 Java 时 /usr/bin/java
How do I compile my java program from commandline?
如何从命令行编译我的 java 程序？
采纳答案by HeatfanJohn
As mentioned by @Blorgbeard you most likely do not have a Java JDK (Java Development Kit) installed. See this web pagefor more information about the various versions of Java available for Ubuntu.
正如@Blorgbeard 所提到的，您很可能没有安装 Java JDK（Java 开发工具包）。有关可用于 Ubuntu 的各种 Java 版本的更多信息，请参阅此网页。
The following command will install the OpenJDK version of the Java JDK:
以下命令将安装 Java JDK 的 OpenJDK 版本：
apt-get install default-jdk
回答by user2862244
I have Ubuntu 12.10, with java "1.6.0_27", this command makes javac available:
我有 Ubuntu 12.10，使用 java“1.6.0_27”，此命令使 javac 可用：
sudo apt-get install default-jdk
Then compile it like this:
然后像这样编译它：
el@apollo:~/retreat3$ javac HelloWorld.java
el@apollo:~/retreat3$ java HelloWorld
Hello, World!
回答by GlenM
I was having the same problem. I used the following command
我遇到了同样的问题。我使用了以下命令
sudo apt-get install openjdk-7-jdk
sudo apt-get install openjdk-7-jdk
The app compiled after that. Not sure what the difference is to the above solutions. Maybe I wouldn't of had to specify a version.
之后编译的应用程序。不确定与上述解决方案有何不同。也许我不必指定一个版本。
回答by Sachin from Pune
just copy and paste on your Terminal
只需复制并粘贴到您的终端上
sudo apt install openjdk-8-jdk-headless
sudo apt 安装 openjdk-8-jdk-headless
回答by rotarydial
In my case, I had the JDK installed, but I'd installed it manually so it wasn't added to the path. Once I added these lines to my .zshrc file (I'm using zsh; if you're using bash, add them to .bash_profile) and relaunched the terminal, it worked:
就我而言，我安装了 JDK，但我手动安装了它，所以它没有添加到路径中。一旦我将这些行添加到我的 .zshrc 文件中（我使用的是 zsh；如果您使用的是 bash，请将它们添加到 .bash_profile）并重新启动终端，它就起作用了：
# Java environment variables
export JAVA_HOME='/opt/jdk/jdk1.8.0_241' #change accordingly; this needs to match your JDK's location!
export PATH=$PATH:$JAVA_HOME/bin
回答by arnav
Actually, java command was working on my ubuntu 16.04 but not javac. At first, I fiddled around with the environment paths and all as i thought i had all java packages installed and the issue was with setting the environment path variable.
实际上，java 命令在我的 ubuntu 16.04 上工作，但不是 javac。起初，我摆弄环境路径，因为我认为我已经安装了所有 java 包，问题在于设置环境路径变量。
Then i tried the command update-alternatives --list javawhich returned a path but update-alternatives --list javacdid not.
This explained to me that javac needed to be installed so I ran sudo apt-get install default-jdk
然后我尝试了update-alternatives --list java返回路径但 update-alternatives --list javac没有的命令。这向我解释了需要安装 javac 所以我跑了sudo apt-get install default-jdk
But incase you get a path in running the update-alternatives --list javacthen i suggest you should try setting up your $JAVA_PATH or creating symbolic links. Help to that can be found on the page unable to run javac on Ubuntu.
但是，如果您在运行时获得了路径，update-alternatives --list javac那么我建议您应该尝试设置您的 $JAVA_PATH 或创建符号链接。可以在无法在 Ubuntu 上运行 javac的页面上找到帮助。
