Java

JDK Dynamic agent and Cglib dynamic agent1.JDK Dynamic AgentThe dynamic proxy for the JDK is very simple to use, but it has a limitation that objects that use dynamic proxies must implement one or more interfaces. Interface 1 Man.javaInterface

http://my.oschina.net/wangyumin/blog/387627The last reflection method calls the private member, and the method is recently encapsulated two times. Reflectutil.java Partial code slightly/** * Invoking method Plus * * @param object Java Object *

Problem:The problem needs to be stored in large numbers, but int can also hold the input n,m so it is not necessary to use BigInteger to install.When starting to load N with BigInteger, even converting 0 to BigInteger, the IF statement used to judge

It is very simple to compute a basic type or an object's memory size in C + +, as long as the sizeof () operator in the library is called, but the Java API does not provide us with a similar method. So can we implement the sizeof () method in Java

Description Parent class is FA and subclass is child member variable = global variable a variable defined outside a method within a class Static member =static decorated global variables member variable = defined inside

Java garbage collection mechanism (1) The garbage collection mechanism algorithm is an important factor to limit the efficiency of the JVM.There are many kinds of algorithms to implement garbage collection, the use of separate is always mixed, so

Basic ConceptsIn the Java Runtime environment, for any class, can you know what the properties and methods of this class are? Can any one of its methods be called for any of the objects?The answer is yes.This dynamic acquisition of information for

PackageCOM.SJF;Importjava.net.Inet4Address;Importjava.net.Inet6Address;Importjava.net.InetAddress;ImportJava.net.NetworkInterface;ImportJava.net.UnknownHostException;ImportJava.util.Enumeration;/** * * @author sjf0115 * * * * Public class

First, the layout of the relevant container is set to setlayout (null);Then call the component's SetBounds () methodThe position of the button is set to (100,100) the length width is 60,25Jbutton.setbounds (New Rectangle (100, 100, 60, 25));?

1. OverviewBefore introducing the paradigm, the Java type is divided into primitive types, complex types , where complex types are divided into arrays and classes . Once the paradigm is introduced, a complex type can be subdivided into more

　　　　　　　　　　　　　　　A simple summary of the color classes in Java1. Common sense of colorAny color is composed of three primary colors (RGB), Java support 224 for color, that is, the red-green-blue component valueBetween 0-255 (8-bit

Reflection in JavaThis document is the basic knowledge part of reflection.A program capable of analyzing classes is called reflection (reflective).　　The reflection mechanism allows the program to obtain the internal information of any known-named

First, function Description:The files are converted into binary data into the database, and when needed, they can be removed for installation and use.Second, the database:Create a database field to store the image into binary, this field has a

The sequential table represented by the sequential storage structure is called the sequential table.It stores data elements in a linear table at once with a contiguous set of address storage units.The implementation of sequential tables is the

The main causes of deadlocks are:(1) Due to insufficient system resources.(2) The sequence of progress of the process is not appropriate.(3) Improper allocation of resources and so on.If the system resources are sufficient, the resource request of

Java Threading InteractionThreads run independently, but when multiple threads need to access a shared resource simultaneously, a thread's synchronization (synchronized) is used, which is equivalent to a lock on the shared object resource, with only

1 Integer typebyte accounted for 1 bytes (1 bytes in memory 8 bitsShort takes 2 bytesint accounted for 4 byteslong takes 8 bytes2 Floating-point typefloat takes 4 bytesdouble takes 8 bytes3 Character Typechar is 2 bytes, character data is 16-bit

One, the coding tool1.ide:eclipse or idea, familiar with as many shortcut keys as possible, "Eclipse Common Shortcuts List"2. Plugins:(1) Findbugs, it is necessary to perform a static code check before release(2) Clover, care about your unit test

For something that you want to represent a finite kind of thing in a program, generally we can do it in two ways: public static final String constant, and second, using Enum to represent. In general, the former is simple, but not very good to

Java supports stream-based communication and packet-based Communication,and the first is universal.Create ServerSocket1.Create serversocket ServerSocket serversocket=new ServerSocket (port); 2.Listen to the Connect Socket