Abstract classes and abstract methods:
An abstract class is not instantiated
Anonymous subclass of abstract class:
interface
java by the new interfaces when the object to anonymous inner classes (lambda expression) of the method is not implemented manner, so as to achieve the effect of the new objects!
8. The specific use of the interface, such as parameters reflect polymorphism is Usb computer interface need to pass parameters to achieve Usb interface Flush
Embodies oriented programming interface
9. The interface can be considered as the norm
Java class can implement multiple interfaces
If a subclass (or implementation class) inherits the parent class and interface declared in the parameters of the same name with the method, the subclass does not override another method with the same parameters of the same name in the parent class Mok Oh this method still out case - --- "category priority principle
If implemented class implements a plurality of interfaces, a plurality of default method defined in the interface with the same name as the parameter, and then the achievement of the class does not override, the interface method must be rewritten conflict
How then subclass (or implementation class) method call the parent class or interface:
Inner classes
abnormal
error is not generally write the code targeted for processing
Red: abnormal compiled Blue: runtime exception
Exception Handling way:
Method 1: try catch finally
Second way: throws
try-catch-finallly abnormal, so that when the processing is no longer being given the compiler at compile time too, but may still run error.
Equivalent to using the structure may appear unusually delay time appears to run a compile-time.
How to choose which developed an unusual use:
