Simple Packages
Java Program (MyPackageClass.java)

// MyPackageClass.java (inside mypackage folder)

package mypackage;

public class MyPackageClass
{
    public void displayMessage()
    {
        System.out.println("Hello from the mypackage package!");
    }
}
Java Program (Pack.java)

// Pack.java

import mypackage.MyPackageClass;

public class Pack
{
    public static void main(String[] args)
    {
        MyPackageClass obj = new MyPackageClass();
        obj.displayMessage();
    }
}