https scratch

Java learns java from scratch (enumeration definition and simple use), and Java starts from scratchI. Enumeration Enumeration refers to a type composed of a set of fixed constants, indicating a specific data set, but all possible values are known when this data set is defined. We recommend that you use uppercase letters for the names of enumerated constants. Enumerated constants are static enumerated fields, which are separated by commas. Use the enum

Java learns 26 from scratch (Packaging class), and java starts packaging from scratchI. Packaging A packaging class encapsulates a basic type into a class. That is, the basic data type is encapsulated into a class type. Java programming provides a packaging class for each basic type. These packaging classes are in the java. lang package. There are 8 packaging classes. Ii. constructor and static methods of the packaging Class 2.1, first Public Type (ty

Java (DATE and Calendar class) from scratch, and calendar from scratchI. Date is a relatively simple operation class. You can directly use java. util. the construction method of the Date class can get a complete Date 2. The Calendar class can get the exact time to milliseconds. However, this class itself is an abstract class. If you want to use an abstract class, you must rely on the object polymorphism to instantiate the parent class through the subc

Java learned fourteen from scratch (package and Access Control), java started from scratch1. java package Java file organizationFile functions in Windows are similar. When developing a large project, it is impossible to involve only one java file. It may involve creating dozens or even hundreds of java files. At this time, we can use the package, put related java files together,Use packages to conveniently, quickly, and effectively manage these files

Java learns thirteen from scratch (encapsulation), and java encapsulates from scratch1. What is encapsulation and why? For object-oriented objects, encapsulation is to package methods and attributes into a program unit, and this unit is implemented in the form of classes. To put it simply, blocking is to privatize attributes and provide public methods to access private attributes. Encapsulation: Encapsulation reflection and the relative independence

Java learns from scratch (inheritance), and java inherits from scratchI. Inheritance Inheritance and reuse of previous code is very easy. It can greatly shorten the development cycle, reduce development costs, and increase program maintainability. Inheritance is A way to enable duplicate Class A to directly use the attributes and methods of another class B. Class A can have its own attributes and Methods Ii. Inheritance implementation class inheritan

Java starts from scratch (select the structure), and java learns the structure from scratchI. program structure: Generally, the program structure includes the following three types:1. Sequence Structure 2. Selection structure 3. Cycle Structure 2. Sequence Structure The program runs row by row. After a statement is executed, the next statement is executed until the end of the program. 3. Select structure the structure is determined based on whether th

Java learning from scratch (data type), java from scratchI. Java Data Type Division Ii. Basic Data Types No. Data Type Size/Bit Data range that can be expressed 1 Long (long integer) 64 -9223372036854775808 ~ 9223372036854775807 2 Int (integer) 32 -2147483648 ~ 2147483647 3 Short (short integer) 16 -32768 ~ 32767 4 Byte (BIT) 8 -128 ~ 127 5 Char (cha

Zynq 7000 starts from scratch and q7000 starts from scratchThis article describes how to use PS gpio, which does not involve fpga. The software involves the creation of the first-level boot program fsbl and the creation of the app. The program runs in ddr.The mio 50 pin of the z-turn board is connected to the key K1. The function of this experiment is to detect the key and print the corresponding information from the serial port.1. Build a hardware mo

Java development starts from scratch, and java starts from scratch When I started to learn Java, I felt more fragmented than. NET. So I wrote a post to record the pitfalls I had stepped on, which were not easy to find on the Internet. 1. java Command Format:> cd % pakadgePath> java pakadge. class; note that the path is the package path rather than the class path. The full name of the class is used from th

Learn how to handle android events from scratch There are a variety of events in android, each of which has its own Processing Mechanism For example 1 Click Event View. OnClickListener Public abstract void onClick (View v) Triggered when a component is clicked 2 Click Event View. OnLongClickListener Public abstract boolean onLongClick (View v) Triggered when long-pressed Compone

Learning the html (11) CSS box model from scratch-bottom, starting from scratch cssVi. Box Model-border (1) 1 Box Model-border (1) The border of the box model is the line centered around the content and the padding. You can set the width, style, and color of the line (three border attributes ). For example, the following code sets the Border width to 2px, the style to solid, and the color to red as the bord

PHP learning from scratch, php learning from scratch I wrote this series of articles to urge myself to regularly and quantitatively digest some knowledge every day!At the same time, in order to let the people in need learn something ~!My technology is really not high! This article may contain errors! I hope you will be able to remind me and everyone after discovering this!Secretly speaking, the final goal

(), event.gety ()); InvalidatE (); break;default:break;} return true;} private void TouchDown (float x, float y) {mpath.reset (); Mpath.moveto (x, y); MX = X;my = y;} private void TouchMove (float x, float y) {float dx = math.abs (x-mx); float dy = Math.Abs (y-my); if (DX >= touch_toler ance | | Dy >= touch_tolerance) {mpath.quadto (MX, my, (x + MX)/2, (y + MY)/2), mx = X;my = y;}} private void TouchUp (float x, float y) {mpath.lineto (x, y); Mcanvas.drawpath (MPath, Mpaint); Mpath.reset ();}}S

PHP lottery probability algorithm (scratch card, big turntable), Lottery scratch card This example for everyone to share the probability of PHP winning algorithm, can be used for scraping cards, large turntable and other lottery algorithm, the use is very simple, the code has detailed comments, for your reference, the specific content as follows The above is the PHP lottery probability algorithm of a

[Book Note: Android game programming starts from scratch] 12. Game Development BASICS (Canvas), Learning android from scratch 1. Canvas Canvas of the Canvas class encapsulates graphics and image painting. Common functions of this class are described as follows: DrawColor (int color) Purpose: Draw a color-covered canvas, which is often used for screen swiping. Parameter: color value, which can also be expre

Django starts from scratch and django starts from scratch 1. Download and install django Method 1: pip install Django = 1.6.5 Test whether the installation is successful: ~ $ Python Import django ~ $ (1, 6, 5, 'final', 0) 2. Method 2: Most people will consider installing the latest official release from http://www.djangoproject.com/download. Django uses the Python standard distutils installation method

[Book Note: Android game programming starts from scratch] 9. Game Development BASICS (how to quickly enter Android game development), learn android from scratch 1. Do not blindly view API documentationMany people prefer to explore API documentation when learning a new platform language. Not to mention the effect, at least the editor thinks that this method is not suitable for most people to follow suit. The

Learning html from scratch (1) and learning html from scratch I. Create my first webpage for the initial code experience 1 Initial code experience In the code, enterHello WorldString. Note:Hello WorldThe text must be writtenBetween two labels. For example: Ii. Relationship between Html and CSS 1 Relationship between html and css To learn basic web Front-end development technologies, you must master the foll

Learning Object-C from scratch --- learning Cantonese from scratch on the first day Start learning object-c from "hello world" //// Main. m // Demo1 /// Created by lee on 14/10/27. // Copyright (c) 2014 lee. all rights reserved. // # import 1. object-c Annotation Object-c has two main annotation Methods: one is (// annotation, single line annotation), and the other is (/**/, multi-line annotation) 2. # imp