JAVA

create database java

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;

public class JDBCExample {
   static final String DB_URL = "jdbc:mysql://localhost/";
   static final String USER = "guest";
   static final String PASS = "guest123";

   public static void main(String[] args) {
      // Open a connection
      try(Connection conn = DriverManager.getConnection(DB_URL, USER, PASS);
         Statement stmt = conn.createStatement();
      ) {		      
         String sql = "CREATE DATABASE STUDENTS";
         stmt.executeUpdate(sql);
         System.out.println("Database created successfully...");   	  
      } catch (SQLException e) {
         e.printStackTrace();
      } 
   }
}

how to create database in java

go to firebase make a acounnt 
make app and add a app pk and name all info of your app
go to databaes realtime and get https of databaea and add for your app
and firebase give your many things like storge....