CODEWITHSUNDEEP
javapackage
A. Duff
A. Duff

Reputation: 4309

Confused about correct way to import packages

My directory structure is very simple: in one directory, I have one file called Foo.java and one file called Bar.java

Foo.java:

package Foo;

public class Foo {
}

Bar.java:

import Foo.*;

public class Bar {
  public static void main(String argv[]) {
    Foo foo; // This line breaks compilation

    System.out.println("Hello world!");
  }
}

Everything compiles fine without the line Foo foo. But when I add it, I get:

$ javac Bar.java Foo.java 
Bar.java:5: error: cannot access Foo
    Foo foo;
    ^
  bad class file: ./Foo.class
    class file contains wrong class: Foo.Foo
    Please remove or make sure it appears in the correct subdirectory of the classpath.
1 error

What am I doing wrong?

Upvotes: 1

Views: 102

Answers (2)

LowLevel
LowLevel

Reputation: 1095

If both Foo.java and Bar.java are in the same Foo package, you don't need to import Foo.* package (this way import static methods and shared constants of Foo class); You just write:

package Foo;

public class Bar {
    public static void main(String[] args) {
        Foo foo;
        System.out.println("Hello World");
    }
}

If you have made two different packages: Foo for Foo.java and Bar for Bar.java, you write:

package Bar;

import Foo.Foo; // or import Foo.*;

public class Bar {
    public static void main(String[] args) {
        Foo foo;
        System.out.println("Hello World");
    }
}

Upvotes: 2

Ramanlfc
Ramanlfc

Reputation: 8354

javac Bar.java Foo.java , this is plain wrong .Foo is in a package named Foo(please use a different name to avoid confusion).

you'll have to use javac -d "path to classes dir here" Foo/Foo.java and javac -d "path to classes dir here " Bar.java .

Upvotes: 1

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