Answer 1

You can visit the following link:

🔵https://code.tutsplus.com/tutorials/learn-java-for-android-development-introduction-to-java--mobile-2604

🔴https://blog.teamtreehouse.com/java-basics-for-android-development-part-1

YouTube channel:
🔵Learn Java with Android Studio: https://www.youtube.com/playlist?list=PLB--808VLJNYhYs1SHZw-v8KSt7IOWsrs

🔴Java Programming with Android Studio: https://www.youtube.com/playlist?list=PLB--808VLJNYLPy8CHXiEXrRTLiL3B0l1

🔵Android Studio Tutorials - Java: https://www.youtube.com/playlist?list=PLs1bCj3TvmWkKR5My5W48tCNGpYuwWDLl