java 9 jlink example

Discovered Google's Gson, because before for protocolbuf some understanding, with some curiosity, I began to use the Gson.GitHub Home: Https://github.com/google/gsonBy comparison, Gson and other existing Java JSON class libraries have the greatest difference when Gson need to serialize the entity classes do not need to use annotation to identify the fields that need to be serialized, while Gson can flexibly configure the fields that need to be seriali

First, the basic concept(a) The three main characteristics of object-oriented: 1. Encapsulation 2. Inheritance 3. Polymorphism(ii) Encapsulation: Hide the implementation details and provide public access (interfaces) externally.One embodiment of encapsulation: to privatize the properties and provide a corresponding setxxx GetXXX method to access them.Benefits of Encapsulation:1. Improve security. Direct access to details is not allowed. and accessible through public means, to achieve control.2.

Java parseint () Syntax: static int parseint (String s) static int parseint (String s, int radix) Parameter: string s: Represents a representation of a decimal string int radix: means to convert a string to an integer For example: int c=integer.parseint ("12", 8); That will be understood as double quotes in the 12 is a octal number, that is, binary 1010, converted to decimal is 10 Application Examples:

1 Public classTestanimal {2 Public Static voidMain (string[] args) {3Testanimal T =Newtestanimal ();4T.func (NewAnimal ());5T.func (NewDog ());6 7T.func (NewCat ());8 9 }Ten Public voidFunc (Animal a) {//Animal a = new Dog (); One a.eat (); A a.jump (); - - if(AinstanceofDog) { theDog d =(Dog) A; - D.wang (); - } - if(AinstanceofCat) { +Cat C =(Cat) A; - c.catchmouse (); + } A

Error"); About e.printstacktrace (); $ } - } - - Private StaticConnection connectionget () A { +Connection conn =NULL; the Try - { $conn =drivermanager.getconnection (URL, user, password); the } the Catch(SQLException e) the { theSYSTEM.OUT.PRINTLN ("Database link Error"); - e.printstacktrace (); in } the returnConn; the } About the Private Static voidClose (ResultSet rs, Statement stmt,