Java JFrame change Icon

I have learn about GUI programming using java this week. I have created a simple window (using JFrame) and get the default icon in titlebar is a default java icon. But, I dont like this default icon image and want to change with another image. This is a complete code how to change JFrame icon

Manifest merger failed Attribute application icon

I have created code in android without problem. But, when I added new external library, I get error message like this : [crayon-5e558887d1755318020575/] This error related with my external library have icon setting and conflict with my icon program. We can solve this problem with editing AndroidManifest.xml file. My original contents of this file like

Android show alert window with button

I am learn about android programming in my free time. I am planned to create a simple alert window with a button. We can use AlertDialog class to create android alert window in Android. The sample output using this class as like picture below. I have created a simple function how to create Android alert