Java

Java is a strongly typed programming language, so when declaring a variable, you must declare the data type, the Java language has the basic data type and the reference data type two big data types, the basic data type has 8 kinds are 4 integral

Anti-compilation Toolhttp://download.csdn.net/detail/u011110110/8621653Anti-compilation Method:The first step: you first change the download of the package suffix name to. zipThe second step: to search the Internet Dex2jar, download one, extract to

Package Quicksort;/*** Quick Sort* @author Administrator**/public class Testmain{/**** @param start position* @param End Position*/public static void Sortarray (int[] array,int start,int end){if (Start >= end){return;}int startIndex = start;int

===================================Basic Knowledge Chapter===================================PolymorphicJava ReflectionJava serializationInner class actionFinal effectInterface and AbstractClass differencesSynchronized and Volatile differencesThe

Language: JavaDevelopment platform: MyEclipse1: Build a Java Project2: Click on the top left corner File→java ProjectProject is the item name, location is the project's address, and then a Java project is created as soon as you finish.The Java

Reverse digits of an integer.Example1: x = 123, return 321Example2: x = -123, return-321Problem Solving Ideas:It is not difficult to flip a number, can be turned into a string type flip, can also be flipped, the main problem involves the boundary

Here, you think of yourself as God.1. ObjectsYou want to show your friends a graph, if you create a rotating square, a circle, and a triangle, he wants to see which graph you will show him which graph, is object-oriented;If you create a deformed

1. Risk of activity Deadlock (most common) Hunger Starvation occurs when a thread cannot continue execution because it cannot access the resources it requires. The most common resource that causes starvation is the CPU clock cycle .

1 Packagesorting;2 3 /**4 * Heap Sorting5 * Average O (nlogn), preferably O (nlogn), Worst O (nlogn), Space complexity O (1), unstable, more complex6 * @authorZeng7 *8 */9 Public classDuipaixu {Ten One Public Static voidDuipaixu (int[] a)

The total memory is divided for4 sections (Stack segment, heap segment, code segment, data segment)When we declare a local variable in the program, this variable is stored in the stack segment (stack);This object is placed in the heap segment when

1 Packagesorting;2 3 /**4 * Quick Sort5 * Average O (nlogn), preferably O (nlogn), Worst O (n^2), Space complexity O (NLOGN), unstable, more complex6 * @authorZeng7 *8 */9 Public classKuaisupaixu {Ten One Public Static intSortint[]

One of the simplest event bus implementationsMicrobus UseRegistered class Receiver implements MicroBus.BusEventReceiver { public onCreate() { bus.register(this, String.class); } public onDestroy() { bus.unregister(this, String.

MultithreadingImplement Runnable Interface than inherited thread class has the advantage of:1 ): Suitable for multiple threads of the same program code to process the same resource2 ): You can avoid Java The limit of single inheritance in3 ):

One, the date and string of the reciprocal usage, here need to use SimpleDateFormatDate date = new Date ();Set formatSimpleDateFormat SDF = new SimpleDateFormat ("Yyyy-mm-dd HH:mm:ss");String strdate = Sdf.format (date);String converted to date

Let's start by explaining several concepts:Multiplication principle: Do one thing, complete it need to divide into n steps, do first step have M1 different method, do second step have m2 different method, ..., do nth step have mn differentmethod,

Import java.text.*;public class Stringalign extends format{public static final int just_left= ' l '; Left-to-Chi Chang volumepublic static final int just_right= ' R '; Right to Chi Chang amountpublic static final int just_center= ' C '; Center

1 Packagesorting;2 3 /**4 * Merge Sort5 * Average O (nlogn), preferably O (nlogn), Worst O (nlogn), Space complexity O (n), stable, more complex6 * @authorZeng7 *8 */9 Public classGuibingpaixu {Ten One Public Static voidMerge (int[]

Simple multi-threaded applications Well, when talking about the thread application, we need to first know how to create the thread. There are two ways to create a Thread: 1. inherit Thread class 2. Declare and implement the Runnable Method Method 1:

Baseline 2 (48) of the timer, 248 of the baselineFilterChain When a web project has multiple connectors, and these processors overwrite the same url. In this case, the attacker chain/is formed /. first cn. itcast. filter. FirstFilter second

Basis of the browser 3-page cache and Verification Code Generation (49), over 49 Set some page cache or do not cache To prevent all browsers from caching pages: Response. setHeader ("expires", "-1 "); Response. setHeader ("pragma", "no-cache