uml diagram from java code

keyword, but run very low efficiency synchronous code block, efficiency is also low for some important code (instantiation statements) alone synchronization, efficiency, but there will be problems using the Enum enumeration data type to implement Singleton mode with DCL double check lock Supplementary Supplements Schematic diagram of method and state relation S

Program small white in the process of writing code, often inadvertently write a memory overflow exception occurred code. A lot of times this kind of anomaly how to produce all silly confused, if can deliberately write to let JVM memory overflow code, sometimes it seems not easy. Recently, by learning the deep understanding of

, then A is also a subtype of C. In the diagram above: Fujiapple (Fuji Apple) is a subtype of apple Apple is a sub-type of fruit (fruit) Fujiapple (Fuji Apple) is a subtype of fruit (fruit) All Java types are sub-types of type object. Any subtype A of type B can be assigned to a declaration of type B: Apple a = ...; Fruit f = A; subtypes of generic types If an instance of an Apple object can be assigned to

Selectionkey.op_connect (8) Read Events Selectionkey.op_read (1) Write events Selectionkey.op_write (4) The server and the client each maintain an object that manages the channel, which we call selector, which detects events on one or more channels (channel). We take the server as an example, if the service side of the selector register read events, at some point the client sent some data to the server, blocking I/O then call the Read () method blo

Through source code analysis of HashMap and HashSet, the Hash storage mechanism set and reference are just like the reference type array. When we put Java objects into an array, not really put a Java object into an array, but put the object reference into an array. Each array element is a reference variable. Actually, HashSet and HashMap Through source

service-side events Selectionkey.op_connect (8) Read Events Selectionkey.op_read (1) Write events Selectionkey.op_write (4) The server and the client each maintain an object that manages the channel, which we call selector, which detects events on one or more channels (channel). We take the server as an example, if the service side of the selector re

Graphic Java IO: 2. Source Code of FilenameFilter, iofilenamefilter Writer: BYSocket) Weibo: BYSocket Bean flap: BYSocket FaceBook: BYSocket Twitter: BYSocket From the previous illustration of Java IO: 1. The File source code did not finish all the File. This time I will talk about FilenameFilter, which is written In t

instruction in the standard row is executed.Class Coverage: The measure calculates whether the class file is executed.Branch coverage: Measures the branch coverage of if and switch statements, calculates the total number of points within a method, and determines the number of branches that are executed and not executed.Method Coverage: Measure the method execution of the program under test and whether execution depends on whether or not at least one of the instructions in the method is executed

. Instruction overlay: The counting unit is a single Java binary code directive, which provides information about whether the code is executed and measures a fully independent source format. Cyclomatic complexity: In a (linear) combination, the minimum number of possible paths in a method is computed, and the missing complexity also indicates that the test case d

Java Picture Compression Code Copy Code code as follows: Package com.img; Import Java.awt.Image; Import Java.awt.image.BufferedImage; Import Java.io.File; Import Java.io.FileOutputStream; Import java.io.IOException; Import Javax.imageio.ImageIO; Import Com.sun.image.codec.jpeg.JPEGCodec; Import Com

similarities and differences between OC and the Java syntax prototype model First of all they have a key point-copy, iOS has a depth of copy, of course, there are also Java inside we can use a common diagram to expressIn general, the shallow copy is just a copy of the pointer, the resource is not copied, the copied pointer all point to the same memo

the last one; Repeat steps until the sort is complete. 1.2 Motion Diagram Demo1.3 Code implementation1 /** 2 * Bubble sort 3 * 4 * @param array 5 * @return 6 * /7 public static int[] Bubblesort (int[] Array) {8 if (Array.Length = = 0) 9 return array;10 for (int i = 0; i 1.4Algorithm AnalysisBest case: t (n) = O (n) worst case: t (n) = O (n2

http://ourjs.com/detail/52a914f0127c763203000008As everyone knows PayPal is another large company migrating to the node. JS platform, Jeff Harrell's blog, node. js at PayPal explains why the migration came from Java: one-time increase in development efficiency (2 people who do 5 of their lives with less), One-fold performance increase, code volume reduced by 33%, file reduced by 40%:(Small: I think the unde