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FORMAT ALL THE THINGS

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Tianon Gravi
2015-02-12 11:49:46 -07:00
parent 34b38dc22d
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java/content.md
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# What is Java?
Java is a concurrent, class-based, object-oriented language specifically
designed to have as few implementation dependencies as possible. It is intended
to allow application developers to "write once, run anywhere", meaning that code
that runs on one platform does not need to be recompiled to run on another.
Java is a concurrent, class-based, object-oriented language specifically designed to have as few implementation dependencies as possible. It is intended to allow application developers to "write once, run anywhere", meaning that code that runs on one platform does not need to be recompiled to run on another.
Java is a registered trademark of Oracle and/or its affiliates.
> [wikipedia.org/wiki/Java_(programming_language)](http://en.wikipedia.org/wiki/Java_(programming_language))
> [wikipedia.org/wiki/Java_(programming_language)](http://en.wikipedia.org/wiki/Java_%28programming_language%29)
%%LOGO%%
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## Start a Java instance in your app
The most straightforward way to use this image is to use a Java container as
both the build and runtime environment. In your `Dockerfile`, writing something
along the lines of the following will compile and run your project:
The most straightforward way to use this image is to use a Java container as both the build and runtime environment. In your `Dockerfile`, writing something along the lines of the following will compile and run your project:
FROM java:7
COPY . /usr/src/myapp
WORKDIR /usr/src/myapp
RUN javac Main.java
CMD ["java", "Main"]
FROM java:7
COPY . /usr/src/myapp
WORKDIR /usr/src/myapp
RUN javac Main.java
CMD ["java", "Main"]
You can then run and build the Docker image:
docker build -t my-java-app .
docker run -it --rm --name my-running-app my-java-app
docker build -t my-java-app .
docker run -it --rm --name my-running-app my-java-app
## Compile your app inside the Docker container
There may be occasions where it is not appropriate to run your app inside a
container. To compile, but not run your app inside the Docker instance, you can
write something like:
There may be occasions where it is not appropriate to run your app inside a container. To compile, but not run your app inside the Docker instance, you can write something like:
docker run --rm -v "$PWD":/usr/src/myapp -w /usr/src/myapp java:7 javac Main.java
docker run --rm -v "$PWD":/usr/src/myapp -w /usr/src/myapp java:7 javac Main.java
This will add your current directory as a volume to the container, set the
working directory to the volume, and run the command `javac Main.java` which
will tell Java to compile the code in `Main.java` and output the Java class file
to `Main.class`.
This will add your current directory as a volume to the container, set the working directory to the volume, and run the command `javac Main.java` which will tell Java to compile the code in `Main.java` and output the Java class file to `Main.class`.

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java/license.md
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View [license information](http://openjdk.java.net/legal/gplv2+ce.html)
for the software contained in this image.
View [license information](http://openjdk.java.net/legal/gplv2+ce.html) for the software contained in this image.