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How Class.forName() load the Driver and DriverManager.getConnection() return connection?
These are the steps happing inside
Step 1.
Class.forName("com.mysql.jdbc.Driver") load the Driver.
Step 2.
In the com.mysql.jdbc.Driver class there is static bock . That will execute because of static bock.
static
{
try
{
DriverManager.registerDriver(new Driver());
}
catch(SQLException E)
{
throw new RuntimeException("Can't register driver!");
}
}
This static block call DriverManager.registerDriver(new Driver());

Step 3.
Inside DriverManager.registerDriver() method.
public static synchronized void registerDriver(java.sql.Driver driver)
    throws SQLException {
    
    DriverInfo di = new DriverInfo();
    di.driver = driver;
    di.driverClass = driver.getClass();
    di.driverClassName = di.driverClass.getName();
    drivers.addElement(di);
    println("registerDriver: " + di);
}

DriverManager class create a Vector name drivers and add the Driver class to the vector.
Now In the Vector we have com.mysql.jdbc.Driver object.

Step 4.
To get connection we can
Connection con = DriverManager.getConnection(?jdbc:mysql://localhost:3306/testDB?,?username?,?password?);
In this method , it search the Driver in the vector , if available then connect and return connection.
for (int i = 0; i < drivers.size(); i++) {
     DriverInfo di = (DriverInfo)drivers.elementAt(i);
// if ?jdbc:mysql? keywork withic in input , match with the driver in the vector {
Connection result = di.driver.connect(url, info);

}
}
Return connection;
This class getting jdbc:mysql://localhost:3306/testDB as input . This class check for the driver based on ?jdbc:mysql? in this case and connect the driver.

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