Opening class in package from console in Java

Question

So when i try to open a java class that's not in a package from the command prompt it all works fine, but when I try to open a class that's in a package it gives me NoClassDefFoundError. And when I list the package when I try to open the class (java somepackage/someclass) it says that it can't load or find the main class.

Any help?

Answer 1

What I can infer is, you have two classes:

Test.java:

// no package defined here

class Test{
    public static void main(String[] args){
        System.out.println("Test");
    }
}

so you can compile and run it using:

javac Test.java
java Test

Another class:

Test.java:

package test; // package defined here

class Test{
    public static void main(String[] args){
        System.out.println("Test");
    }
}

And thus doing same thing gives you error. For this you need to be in the parent directory of 'test' folder in your terminal or cmd and use:

java test.Test

No problem with compiler. You can compile as usual using javac Test.java from inside 'test' folder.