Compile and build with single command line Java (Linux)

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Is there way to set up an alias in such a way so that I could enter the command, followed by the argument in a single line?

For example, instead of

javac Program.java && java Program

I would be able to go

newcommand Program.java //or "newcommand Program", whichever is easier

which would do the same commands as the line above.

An alias is not made to accept parameters, define a function like this:

jcar() { javac $1.java && java $1 ; }

Then use it:

jcar Program

(jcar was intended as an acronym for java-compile-and-run)

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Adding on to enrico.bacis' answer, i personally don't like to have Program.class files cluttering up my workspace if i'm just testing a program, so i'd do

jcar() { javac $1.java && java $1 && rm $1.class}

in addition, i found it helpful to trap ctrl-c so that even if i end the program halfway, it still removes the .class

jcar() {
trap "rm $1.class" SIGINT SIGTERM
javac $1.java
java $1
rm $1.class
}

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I like to pass the full Program.java filename as the input parameter, allowing easy autocompletion.

Here's an edited version of notcompletelyrational's script, which expects commands like jcar Program.java rather than jcar Program:

jcar() {
  f=$1
  f2=${f%.*}
  trap "rm $f2.class" SIGINT SIGTERM
  javac $1
  java $f2
  rm $f2.class
}

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I was going to answer you giving a piece of Makefile, but it would not be generic enough. Whenever you want to compile a more complex program (let's say 2 files), you need to compile the second as well. It might be in a package, in which case what you're asking does not work any longer. Same thing if you have to handle libraries.

For all these reasons, I strongly advise you to choose a building utility of your choice, make, scons, ant, and let's mention it maven. I find the later way to complex for small projects. But ant is my best candidate for java programs. In the end, you can just ant run which will run your program and recompile it if needed. Have a look on the hello world tutorial with ant.

Executing Single Java Source Files With One Command, In addition, a single source file may compile to multiple class files, which to put a "shebang" on the first line of a Java source code file that is intended to used in Groovy and numerous other languages running in Linux/Unix shells). </​plugins>. 52. </build>. 53. 54. </project>. 55. 2. Mention the below in  Is there way to set up an alias in such a way so that I could enter the command, followed by the argument in a single line? For example, instead of. javac Program.java && java Program I would be able to go. newcommand Program.java //or "newcommand Program", whichever is easier which would do the same commands as the line above.

Adding on to enrico.bacis' and notcompletelyrational's answer, how to run it under a package and clean up the package compiled files:

jcar() { javac -d . $1.java && java ${PWD##*/}.$1 && rm -rf ${PWD##*/}/ }

By the way, this function should be added to ~/.bash_profile for Mac OS and ~/.bashrc for Linux, respectively.

To run it:

jcar ProgramName

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Comments
  • Where do you define the function? In .bashrc? EDIT: Yes, that's where. I figured it out. I appreciate it!
  • add a semicolon, writing jcar() { javac $1.java && java $1 ; } if you want to just define it in the command line, not in a .bashrc or similar.
  • For me it didn't work at all without the semi-colon, it's a syntax error.
  • That more like a "jcarar" -> java-compile-and-run-and-remove