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I have searched this, but I could'n find or understand what I found.
Now I'm not a Java programmer, but I have the need to compile a single Java file into an existing (compiled) Java program. The source of this Java code is not available to me, therefore I cannot compile the entire project.
I'm not interested in decompiling the original project.
How to quickly do this using only the JDK and javac? (Through the command line is what I prefer.)
I understand that to do so error checking outside of the single java file will have to be disabled, because it can't read the dependencies.
Thanks in advance,
-Aidiakapi
EDIT: I do have the JAR file, thanks for the answer :)
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Open a command prompt window and go to the directory where you saved the java program. Assume it's C:\. Type 'javac MyFirstJavaProgram. java' and press enter to compile your code.
Your class has to define a public static void main(String[] args) method. Then find the Java file in the project explorer, right-click on it, and choose "run as Java application". The file name has to be the same (+ extension ".
Type 'javac MyFirstJavaProgram. java' and press enter to compile your code. If there are no errors in your code, the command prompt will take you to the next line (Assumption: The path variable is set). Now, type ' java MyFirstJavaProgram ' to run your program.
One way to do this would be to add a method public static void main(String[] args) containing the code you want to run. Once you've done this, you can right-click on it, choose the "Run as..." option, and select "Java application" to run the program you've written.
As far as I can understand you want to re-compile a single java file and replace it in an existing jar file..
So you compile it..
cmd>javac -classpath jar1.jar;jar2.jar my.company.MyClassToReplace.java
and replace it in the jar.
cmd>jar uf myJarFile.jar my/company/MyClassToReplace.class
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