Java

1. Design Source code/** * * @title: Excelutils.java * @Package: Com.you.utils * @Description: A word description function * @author: Zhanghaidong * @date : 2015-3-21 PM 10:17:34 * @version V1.0 * */package com.you.utils;import java.io.file;import

"This"This does not know what to refer to before the new object is present; When new is an object, this refers to the current object's reference.   "Analysis"int i = 0; Here I refers to a member variable; the Leaf (int i) here is the parameter I

Time Date identifier: yyyy: Year mm: Month DD: Day hh: 1-hour system (1-)Hh:24 Hour (0-in) mm: Min ss: sec S: milliseconds E: Days of the week D: the day of the year F: the first few weeks of January divided by the number of days of the Month by 7 W:

Scope of the variable:1. Java uses a pair of curly braces as a range of statement blocks, called scopes.2. Variables in the scope cannot be defined repeatedly.3. Out of scope, the allocated memory space of the variable will be reclaimed by the JVM.

First, the STRUTS2 processing process: The client generates a HttpServletRequest request, which is submitted to a series of standard filter (filter) build chains (such as Actioncontextcleanup: it is mainly to clean up the actioncontext of the

Java cannot implement multiple inheritance, but interfaces can be used to implement functions like multiple inheritance. multiple unrelated classes can implement the same interface.  A class can implement multiple unrelated interfaces.  like

"Interator Interface"  All container classes that implement the collection interface have a Interator method that returns an object that implements the Interaor interface. The Interator object is called an iterator to facilitate the traversal of

"History"Third-generation languages:(1) C, Pascal, FORTRAN process-oriented language;(2) C + + process/object oriented;(3) Java cross-platform pure object-oriented language;(4). NET cross-language platform.  Fourth generation language:SQL "Features"(

This view structure may be used in menus, or some sort of information that reflects the classification, and so on. Today let's explore how to implement such a content from the backend! If you're a Java user, you're more familiar with the

I. OverviewObject-oriented In addition to encapsulation, inheritance and polymorphism of three characteristics, there are other features, such as abstract abstraction, interface interface, and so on, abstract class mainly as a template for multiple

1. The literal of a char type can be an English letter, a character, or a Chinese character, and is included by a single quotation mark.2. The Java bottom uses a 16-bit integer to handle the character type, which is the Unicode encoded value of a

I just saw a friend in the group asking about queue usage, which is really very seldom used in the actual writing code, but I never used it. It's just learning about data structures.The following is a sample I wrote, I hope there are shortcomings,

Recently in the android4.4 5.0 project, often encountered java.lang.UnsatisfiedLinkError:No implementation found for problem, This problem occurs mainly because the MTK or Qualcomm 5.0 framework code compared to 4.4 has a great change, especially

There are three main types of variables in the Java language: member variables, static variables (global variables), local variablesThe scope is determined by the location of the {}, which determines the visibility and life cycle of the variable

CareerCup: 17.14 minimize unrecognized characters, unrecognizedservice Oh, no! You have just completed a lengthy document when you have an unfortu-nate Find/Replace mishap. You have accidentally removed all spaces, punctuation,and

Java design pattern-Abstract Factory pattern (Abstract Factory)Purpose: provide an interface to create a family of mutually dependent objects without explicitly specifying the object class.When to use: A system should not depend on the details of

SpringMVC obtains the map value on the JSP page. In springmMVC, the jsp page obtains the map value.At the controller layer: Map Map = new HashMap (); Map. put ("key1", "I am map value 1"); map. put ("key2", "I am map value 2");

DDA (digital differential analyzer) draw lines DDA (digital differential analyzer, digital differential analysis) is a line segment scan conversion algorithm. Its main algorithm principle is: Sample a line segment at an interval on one axis to

Remove repeated elements from the arrayMethod 1: Enable auxiliary space # Include # Include # Define LENGTH 10 using namespace std; void Unique () {www. bkjia. comint array [LENGTH] = {1, 1, 2, 2, 4, 6, 6}; int pre = array [0], cur =

Struts2 annotation summary ---- @ Action and @ Result In addition to configuration file configuration, you can also use annotations to configure Below are some common annotationsIntroduction:  @ Action/@ Actions: @ Action specifies a class as action,