Chapter 1 – Getting into Software Design Patterns

1. The compiler compiles Java code into bytecode, which is executed by the JVM and JRE, respectively (refer to Figure 1.3).
2. It refers to abstraction, polymorphism, inheritance, and encapsulation.
3. Method overriding and method overloading.
4. SOLID principles: The single-responsibility principle, open-closed principle, Liskov substitution principle, interface segregation principle, and dependency inversion principle.
5. The program should be open for extension and closed for modification.
6. Design patterns represent the collection of commonly used problems and solutions to produce maintainable software.