Java

public void D1 () throws reflectiveoperationexception{Class cl=class.forname ("Com.daben.dt.class1");Class1 c1= (Class1) cl.newinstance ();Method mth= Cl.getmethod ("saylist", null);Mth.invoke (C1,null);Class1 c1= (Class1) cl.newinstance

I. Methods of dealing with the business under normal circumstancesJust implement the code that handles the business logic. For example, the DoSomething () method in the following dosomething is the code that simulates the processing of the business.

Getactionbar (). Settitle (); Java.lang.NullPoint exception resolution is due to the fact that the low version does not support direct access, modify the scenario:Try changing your theme to Thisand not the AppCompat Version　　In another case, if the

Import java.util.*;p ublic class main{Chainbin bt; Public main () {} public main (Chainbin BT) {THIS.BT=BT; public static void Main (string[] args) {Chainbin root = null; Char Select; do{System.out.println ("1." Set the

1. EncapsulationImportjava.util.Date; Public classHuman {protectedString name; protectedBirthDay BirthDay; protectedString sex; PublicString GetName () {returnname; } Public voidsetName (String name) { This. Name =name; } PublicString

The UDP protocol is non-connection-oriented and is more efficient than the TCP protocol, but not secure. UDP protocol is similar to the process of sending information, whether the receiver is online or shutdown state, will send the information.

Set is an interesting collection. It looks a bit like a list, but the actual operation is a bit like a map. Set is also a collection of records of a series of values, but it is the same as the map key, it cannot be duplicated, otherwise it will fail

、1 Package com.qugeng.jdk;2 3 Public classMethoddemo {4 Public Static voidMain (string[] args) {5Absdemo A =NewAbsdemo ();6 A.say ();7 a.print ();8 }9 }Ten One Abstract classabs{ A Private intAge ; - Public voidTell () { - }

The time operations in Java are all four cases: get the current time, get a certain format of a time, set the time and time of the operation.　　1. Get the current timeThere are two ways to get, first, to use the Java.util.Date class.Date date = new

One, Java installation1. Installing the JDKDownload the JDK installation package, all the way next2, set the JAVA environment variable new environment variable Java_home, set the value for the JDK installation directory (D:\Program files\java\jdk1.8.

Abstract Factory mode provides an interface to customers that enables clients to create product objects in multiple product families without having to specify a specific type of product.Design of the systemThe System class diagram is designed using

Interface isolation principle based on design pattern Principle and Design Pattern Principle Before talking about the interface isolation principle, we should first clarify our main character: What is an interface? There are two types of interfaces:

Repeat java basics (5): Object-oriented and java object-oriented 1. Encapsulation Import java. util. date; public class Human {protected String name; protected BirthDay birthDay; protected String sex; public String getName () {return name;} public

SQLException and jdbcsqlexception caused by JDBC calls on Jsp pages When you connect to the MySQL database locally, you have always used to directly import the JDBC jar package in the project lib. In this way, you only need the following code to

String to numericString to numeric (do not use system functions or methods) I recently saw a question in the interview question, asking to convert the string to a number, for example, converting "58" to "58". I thought for a while, instead of using

Three parsing methods for uploading files using SpringMVC SpringMVC parses the file in action after uploading the file.Jsp page Syntax: Statement of action copying file: /*** 1. Original input/output stream copy file */@ RequestMapping

Dependency inversion principle of design pattern principlesThe Dependence Inversion Principle is dependent on abstraction, not specific. Simply put, it is to program the abstraction and do not program the implementation. This reduces the coupling

Architecture Design Basis1. What are the aesthetic standards of design? 1) conciseness: Modular and easy to read and understand.2) structural consistency (conceptual integrity ): The Style and modularity of the architecture.3) robustness (high

Analysis of JAVA design mode (III)4. Interface isolation Principle: the ISP (Interface Segregation Principle) client should not depend on the Interface it does not need, or the dependency relationship of the class should be established on the

Java basics-encapsulation, inheritance, and PolymorphismJava basics-encapsulation, inheritance, and Polymorphism -- Rapid growth of small instancesAbstract: 1. Objective: to simplify complicated things and make the complicated content orderly. 2.