Java

In Android Studio, Java files are an essential part of Android app development because they contain the code that defines the behavior and logic of your application.
Below is a simple example of a Java file in an Android Studio project. Suppose you have an activity named MainActivity.

Java file "MainActivity.kt" looks like this:

package com.microappvalley.newtestproject

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
    }
}

Package Declaration:

package com.microappvalley.newtestproject;

Imports:
The import statement includes the required classes and packages.

 This example imports classes related to Android development.

import androidx.appcompat.app.AppCompatActivity;

import android.annotation.SuppressLint;
import android.os.Bundle;

onCreate Method:

You can use this method to perform initialization tasks, set up the user interface, and perform other necessary operations when creating an activity.

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)
}

This is just a simple example; your  Java files may contain additional methods and logic depending on your application's needs.
Android Studio provides a powerful environment for Java-based Android development, providing tools and features to streamline the development process.