Java newbie problem: classes of the same package accessing each other?

Question

Classes belong to the same pkg. They are located in a directory named pkg.

• In general, how can classes access each other in the same pkg?

Error

javac PackTest.java PackTest.java:8: cannot find symbol symbol : class PriTest location: class pacc.PackTest System.out.println(new PriTest().getSaluto()); ^ 1 error 

Classes in PKG pacc

 $ cat PackTest.java package pacc; import java.io.*; public class PackTest { public static void main(String[] args) { System.out.println(new PriTest().getSaluto()); } } $ cat PriTest.java package pacc; public class PriTest { public PriTest(){} private String saluto="SALUTO FROM PriTest"; public String getSaluto(){return saluto;} } 

PKG named dir

 $ find .. -type d -name "pacc" ../pacc $ ls ../pacc makefile PackTest.java PriTest.java $ ls makefile PackTest.java PriTest.java 

Solved!

 $ cat makefile p: javac ./pacc/PackTest.java java pacc/PackTest $ make p javac ./pacc/PackTest.java java pacc/PackTest SALUTO FROM PriTest 

Answer 1

MAYBE (So don't kill me, please) this solution:

In the terminal, go to the root of your java project (so by default in your default folder is the parent directory of the pacc folder).
Then enter: javac pacc.PackTest.java

I do not use the compiler manually. My IDE does this for me.

Answer 2

Make sure the files are in the same directory with the same name as the package. Also, make sure the classpath is set correctly.

The packages mimic the directory structure - "Test.java" in the package "org.example.test" should be found in "org / example / test / Test.java".

The following files compiled for me:

  $ javac -cp "." *.java 

And I ran with

  $ cd .. $ java pacc.PackTest 

There is no problem.

By the way, Apache Ant is usually preferred over makefiles in the Java universe.

Answer 3

If you use the C and C ++ approach to compile each file separately, you may be surprised to learn that the Java compiler works best when you fully compile the entire project .

Apache Ant is a commonly used tool for creating Java projects. It makes a javac call for you. It works better for Java than make(1) does.

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Compile as:

 H:\test\so>javac pacc/PackTest.java pacc/PriTest.java 

You must be in the root of your project, not in the pacc folder.

Answer 4

Get the ideal of IntelliJ IDEA. Java is so complex and bloated that it will help, so you don’t even have to worry about such trivial things.

Answer 5

Once you have mastered the basics, the IDE is an important productivity tool.

Until then, it will be helpful for you to think through these issues in order to gain a deeper understanding of Java development.

As for ANT, it’s worth your time to move on to this. Makefiles does not offer you further edification of programming.