Java Question How to make "Nested" mebers in a Library?

dim aml as AudioManagerLib      'that would be my lib
aml.initialize("")        'no events
aml.SetVolume.Music       ' keep in mind that ".Music" Part, for not it is aml.SetVolumeMusic

import android.media.AudioManager;
import android.view.KeyEvent;
import anywheresoftware.b4a.BA;
import anywheresoftware.b4a.BA.ShortName;
import anywheresoftware.b4a.BA.Version;

@Version(value = 1)
@ShortName("AudioManagerLib")
public class AudioManagerLib   {private AudioManager mAudioManager;
    public AudioManagerLib() {
        
    }
    
    /**
     * Minimum APK is 19 for this Method
     * Just type (""), no events in this Library
     * Example:
     * <code> Dim  aml as AudioManagerLib</code>
     * <code> aml.initialize("")</code>
     */   
    public void initialize(final BA ba, String EventName){
        mAudioManager = (AudioManager)ba.applicationContext.getSystemService(ba.applicationContext.AUDIO_SERVICE);
    }
    
    /**
     * Minimum APK is 19 for this Method
     * Toggles Play/Pause Audio from any active Player
     * Example:
     * <code> Dim  aml as AudioManagerLib</code>
     * <code> aml.initialize("")</code>
     * <code> aml.TogglePLayPause</code>
     */   
    public void TogglePLayPause() {   
    KeyEvent downEvent = new KeyEvent(KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE);
        mAudioManager.dispatchMediaKeyEvent(downEvent);

    KeyEvent upEvent = new KeyEvent(KeyEvent.ACTION_UP,KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE);         
        mAudioManager.dispatchMediaKeyEvent(upEvent);
    }

 public void SetVolumeMusic(int i){
     mAudioManager.setStreamVolume(AudioManager.STREAM_MUSIC, i, 0);
     }
}

 /**
     * Minimum APK is 19 for this Method
     * Just type (""), no events in this Library
     * Example:
     * <code> Dim  aml as AudioManagerLib
     * aml.initialize("")</code>
     */