Documenting cold Knowledge in Java

Java Cold knowledge

1. The class of number is not the parent of the class of integer

2. Final static variable The first access will be the class is initialized, and fianl's static constant access does not cause the class to initialize

3. The class application obtained through Class.forName ("OO.OO.A") will initialize the classes, and the application Integer.class get will not initialize the class

4, such son class<number> clazz = Int.class will error and class< Extends Number>clazz = Int.class okay

Documenting cold Knowledge in Java