Java-language perfect data code analysis, java-language solution code
1. Concepts
First, let's understand what is perfect number?
Problem description: if a natural number is used, the sum of all its true factors (that is, the approximate number except itself) exactly equals to itself. This number is called the complete number. Summary"
For example,
6 = 1 + 2 + 32
Learn how to program Java Memory Analysis Java Tutorial published, Welcome to visit through Xuebiancheng8.comJava's memory model is a very important knowledge in Java, and is the focus of the interview.In the memory model of the Java Virtual machine, we deal with many of the
Learn how to program Java Memory Analysis Java Tutorial published, Welcome to visit through Xuebiancheng8.comJava's memory model is a very important knowledge in Java, and is the focus of the interview.In the memory model of the Java Virtual machine, we deal with many of the
Java language for rabbit problem code analysis, java language for Rabbit
1. Thinking
The rabbit problem is a visual representation of the February series. It is a question raised by a mathematician named ononacci in his book.
2. Description
The problem with its body surgery is: if one child is not given birth to a child every month, the child is also produced aft
From JAVA multithreading to cluster distributed and network design analysis, java Multithreading
JAVA multithreading is widely used, and there is almost no way to do it in the current system. In many cases, how to apply multithreading becomes a first choice, in addition, there are a lot of knowledge about
In the development process of Java program, it is unavoidable to encounter memory usage, performance bottleneck and so on. javaprofiler Tools Help developers locate these issues quickly and effectively, making them an important tool in the Java development process. At present, there are many kinds of JavaProfiler tools on the market, this article will briefly introduce several common tools, and compare them
access to the inner class, including the private, including the static Access outside the external class: external Class . Inner class outside class new: To use an existing intrinsic class object to new P.new Inner () in the inner class, access his external class member: External class . this. memberLocal inner class: defines a class that is similar to a local variable in a member method usage is the same as local variable, cannot be decorated with public etc. can access final variables define
Java class templates, objects, instance memory address analysis, java instances
Java class templates are static objects in the method area;
Java objects are stored in the stack memory;
Java instances are stored in heap memory (
changename method finishes executing, the person is destroyed, and the small gang is then reclaimed by the garbage collector because there are no objects to reference it.The following is the last method, when the Testreference.changeage (xiaoming) is executed, the Changeage (person) method is called, and the person is also assigned a space in the stack. This time, the memory address of the xiaoming is stored.Then execute Person.setage (25), when the person pointed to the object is xiaoming, so
J2SE quick advanced -- Java memory analysis, j2se advanced java
Program Execution Process
To analyze the memory in Java, let's first take a look at the program execution process:
As shown in, there are roughly three steps:
1. At the beginning, our program exists in the hard disk. When it is started and running, the p
Dynamic proxy class Principle (example code see Anatomy of the Java Reflection Mechanism (iii))A) understand the dynamic Agent sample process aboveA) understand the dynamic Agent sample process aboveb) Analysis of class source code for Proxy interface implementationLet's take a look at the source code of the Proxy implementation class ($Proxy 0) and the flow of the entire dynamic agent.$Proxy 0 generates th
loader will not go directly to load, it is to see if they have a parent loader no, the result it still has is the root class loader.So this time the root class loader is going to load this class, but under%java_home%\jre\lib, it can't find com.wangmeng.Test this class, so he tells his sub-class loader, I can't find, you go to load it, subclass extension ClassLoader go%java_home %\lib\ext to find, also can't find, it tells its sub-class loader appclassloader, I can not find this class, you go to
Java Source Analysis: The Selectionkey of Java NIO
In Serversocketchannel source analysis we know that when a channel is registered to the specified selector,It actually encapsulates (Channel,selector) as a Selectionkey object and saves the object in the Selector object.
Selectionkeyimpl k = new Selectionkeyimpl ((SEL
Java. lang. ArrayIndexOutOfBoundsException exception analysis and solution, java. lang
Reference: http://blog.csdn.net/javaeeteacher/article/details/4485834
Http://bbs.csdn.net/topics/90298133
This is a very common exception. In terms of names, it is an array subscript out-of-bounds error. The solution is to check why the subscript out-of-bounds.
The following is
[Switch] Java I/O flow concept analysis, java
Address: http://blog.csdn.net/yuebinghaoyuan/article/details/7388059
Streams in Java can be classified from different perspectives.
Different data streams can be divided into input streams and output streams.
Data processing units can be divided into byte streams and batch
Java memory analysis, java memoryPreface
Looking at the code, we may only know the sequence of program execution. Through memory analysis, we can understand the memory allocation during program execution. The former is analyzed in the time dimension, and the latter is analyzed in the spatial dimension.PurposeIt is t
Java Inheritance Analysis and java inheritance
After learning java, I started it again and suddenly found that I still don't understand inheritance. So I did a test to analyze it.
Although there are not many codes, it is not easy for me to fully understand them, so let's take a look,
, wherein car's speed operation formula is: A*B/CThe speed of Plane is calculated as: A+b+c.If you add a 3rd type of transport, such as a train (Train), you do not have to modify any of the previous programs, only the process of writing a new vehicle. 1 Import java.lang.*; 2 interface Common {3 double Runtimer (doublea, double b, double c); 4 String getName ();//Get the name of the vehicle 5} 6 7 class Plane Implementscommon {8 public doubleruntimer (double A, double b, double c) {9 retur N (A
JAVA basics: Floating Point Number Analysis and Thinking in Java-Linux general technology-Linux programming and kernel information. The following is a detailed description. Floating Point Numbers are classified into single precision and double precision. The single precision and double Precision in Java are float and d
Supplementary Chat project function, do the following requirements analysis:Comb the necessary Java Knowledge Base needed for project developmentThe GUI will be implemented with a faster SWTSWT (Standard Widget Toolkit)Standard Widget Toolkit is an open-source GUI programming framework that has similar uses to Awt/swing, and the well-known open source Ide-eclipse is developed with SWT.Prior to SWT, Sun had provided a cross-platform GUI development Kit
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