learning java 4th edition

Constructor and return type: The constructor does not have a return type, and if you add the return value type (including void) to the constructor, the compilation does not error, but it is no longer a constructor, but just a method with the same name as the class in which it resides. Constructors and methods are two different concepts: A constructor cannot be called by an object reference as a method. The constructor is the code to be executed when the object is cre

Today, I happened to find a piece of JAVA learning material from a previous group. In the spirit of serving the masses, I moved to the blog Park:JAVA programming ideas Fourth Edition (English version): practical WEB development classic: http://115.com/file/dpip67fx ------------- Split line ---------Http://115.com/file/c2zsw21d#javacore Technology (8th

that is automatically created by the virtual machine. " Execute " means that the virtual opportunity triggers this method, but does not promise to wait for it to end. Finalize () the more the object escapes the last chance of death, the GC will then make a second small-scale mark on the objects in the F-queue, and if the object is not escaped at this time, it can be recycled.Three, method recovery areamethod Area (HotSpot virtual machine permanent generation) garbage collection mainly recycles

to find that some code is more redundant, and for the method of abstraction is not good enough to improve the coding difficulty, and added some hidden bugs.As for abstraction, it is quite rewarding to read the book "Refactoring".0.2 Open Source Class library Mastering common class libraries and packages outside of the JDK Although the current job is not used temporarily, but the package inside the method looks very useful, temporary mark ...Apache Commons:About Apache Commons-lang

Reprint please specify source address: http://www.cnblogs.com/lighten/p/5906359.html1. Preparation of the compilation environment 1.1 JDK source downloadOPENJDK is an open source project in the history of Java, this article compiles with OpenJDK8 as an example. OPENJDK's official website is: http://openjdk.java.net/, direct access to http://openjdk.java.net/install/index.html into the main interface. On the left there is a series of found source code

Note 1. Java is a modern programming language and is born The Java language has good features (object-oriented) and the best price (free), In the most appropriate place (on the web), and at the most appropriate time (just when the web is becoming popular). 2. May 1995, first edition At the end of 1998, J2SDK 3. Abstraction is a key concept in computing Object

");/** The problem is: Zhao Yun actually do not know is that strategy ah, he only know to dismantle the first bag,* And do not know is backdoor this ingenious idea, how to do? It seems that this strategy model has already written out the name of the stratagem.*Wrong Backdoor, Givengreenlight, Blockenemy is just a code, you write first, second,Third, no one will say you're wrong!** The advantage of the strategy model is that it embodies the characteristics of cohesion-poly-low coupling, the disad

for thread C, thread C waits for thread d, and thread D waits for thread A. Thread A in order to detect deadlocks, it requires a progressive detection of all locks requested by B. Starting with the lock requested by thread B, thread a found thread C and then found thread D, and found that thread D requested the lock to be held by thread A. This is what it knew happened to be a deadlock.Here is a diagram of the lock occupancy and request between four threads (A,b,c and D). Data structures like t

progressive detection of all locks requested by B. Starting with the lock requested by thread B, thread a found thread C and then found thread D, and found that thread D requested the lock to be held by thread A. This is what it knew happened to be a deadlock. Here is a diagram of the lock occupancy and request between four threads (A,b,c and D). Data structures like this can be used to detect deadlocks. So what do these threads do when a deadlock is detected? One possible option is to release