The goal of the JDBC API is to define classes, methods and interfaces that minimize the impedance mismatch and make it easier to marshal data back and forth between a Java program and an external ...

It covers both object-oriented programming techniques and their application to program design including classes, objects and objects lifecycle ... and implementing object-oriented programs in Java.

The compiler can also add additional code to the program if required. After compiling the source code (a .java file), the compiler generates intermediate object code called bytecode which is a .class ...