IOException – Exceptions produced by failed or interrupted I/O operations.

NullPointerException – When expecting from null variables, objects, or classes.

To open Logcat Click View > Tool Windows > Logcat (Alt + 6 or from the toolbar window). Logcat window in Android Studio is used to display real-time system messages and messages that are added in the Log class of the app. In Android Studio one of the most used tools is Logcat. So, this is a very useful component for the app development because this Logcat dumps a lot of system messages and these messages are actually thrown by the emulator. Then, Logcat Window is going to help you to debug the output by collecting and viewing all the messages that your emulator throws. Suppose, you are running your application and the program crashes, unfortunately. Logcat Window is the place where various messages can be printed when an application runs. In this situation, the Logcat acts as our best friend.

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