How to compile and run a java class with a package

Question

I have a class called MyClass in the file MyClass.java file (code mentioned below)

package myclass;

class MyClass {
  public int add (int a, int b){
    return a+b;   
  }

  public static void main(String args[]) {
    MyClass obj = new MyClass();
    System.out.println(oobj.add(2, 3));
  }
}

I am compiling the class with

javac MyClass.java

But I am trying to run the class using

java MyClass

or

java myclass.MyClass

I am getting the Error

Error: Could not find or load main class MyClass

But, I am able to run this program if I omit out the package name. where am I going wrong?

Answer 1

Make sure that you are inside the parent directory of the package folder (the folder in which your compiled class file is), and execute the following command:

java myclass.MyClass

Below is an example file structure:

bin
    -> myclass
        -> MyClass.class

In the example structure above, you would have to execute the command from the "bin" directory.

Also, define the class as public and recompile the java source file.