Class loading is one of the most powerful mechanisms provided by the Java language. Although class loading is not a hot topic, all programmers should understand its working mechanism and understand how to make it meet our needs. This effectively saves our coding time and frees us from the work of continuously debugging classnotfoundexception and classcastexceptio
Java class loading mechanism
class Loader
The virtual machine design team takes the "fully qualified name of a class to describe the binary byte stream" in the class loading phase to the outside of the Java Virtual Machine ,
Java class loader (1)-Class Loader hierarchy and ModelClass Loader
?? The virtual machine design team put the "get and describe the binary byte stream of this class through the full qualified name of a class" action in the class l
ExtClassLoader, and his father cannot obtain ExtClassLoader because it is implemented in C ++.3. Parental Appointment Mechanism
When receiving a request for loading a class, a specific class loader first delegates the loading task to the parent class loader.Delegate a load task to an upstream NodeUntil the parent class
){E.printstacktrace ();}return con;}}
3 The processing class that compiles and reads the data table also puts the processing class into the Java class directory of the PHP invocationThis is a processing class that reads the User Role table returns a JS array of relationships
Welcome to other blogs on this topic:
Deep Dive into Java Virtual Machine (I)-detailed explanation of the underlying structure of Java Virtual Machine
Deep Dive into Java Virtual Machine (II)-class lifecycle (I) class loading and Connection
In-depth
Assignment between Java Neutron class and base class variableA subclass object can be assigned directly to a base class variable.To assign a base class object to a subclass object variable, you must perform a type conversion,Its syntax is:Sub-
Abstract classes: Classes with abstract methods that need to be decorated with the abstractions keywordRelationship DiagramThe code belowPackage com.ray.testobject;/** * Abstract class * * @author Ray * @since 2015-05-02 * @version 1.0 * */public abstract class person {public abstract void getdescription ();}Package com.ray.testobject;/** * Implementation class
I learned Spring today and suddenly wanted to review the Java class loading and class reflection. Consolidate the underlying principles. Some of them refer to Teacher Li Gang's crazy Java handout and Spring3.x enterprise application development practices by Chen xionghua and Lin kaixiong. 1. A command corresponds to a
I recently read Java Concurrent in Practice (java Concurrent programming Practice) and found that I have a superficial understanding of java threads, locks, and other mechanisms, and I have not learned fully enough. I plan to use this book to comprehensively learn about the concurrent development of JDK and some thread-related theoretical knowledge, and fill in m
extends object {}
The calendar class is an abstract class. Since it is an abstract class, it cannot be directly used. At this time, we need to use the concept of object polymorphism to instantiate this class object through the upward transformation relationship.Obtain a com
Static internal abstract classes can be inherited.public class Testfather {public static void Main (string[] args) {Person.talk2 a = new Newtalk ();A.get ();Person Person1 = new Student ("Alice", 20, "female");System.out.println (Person1.talk ());/* Person Person2 = new person (); *///abstract class cannot be called}}Abstract class Person {String name;int age;Str
Java class Inheritance summarizes conversion problems between a parent class type and a subclass typeThis article will describe the conversion problem between the parent class type and the subclass type through an instance, and this very special problem often leads to some potential dangers. For a whole night, you're d
NOTE: Reprint please indicate the source./**------------------------Public Method-------------------------* */*** Add Remove method to array** @param s* The values in the removed array* @return*/Array.prototype.remove = function (s) {for (var i = 0; i if (s = = This[i])This.splice (i, 1);}}/**------------------------Public Method End-------------------------* */**------------------------bytemap Start-------------------------* */*** Simulate Java Map
It turns out that you are such a JAVA [03]-inheritance, polymorphism, abstract class, java Polymorphism1. Inheritance
In Java, the inheritance uses the keyword extends, which is slightly different from the C # syntax.1. Subclass Constructor
A. class file
Note: Each class file corresponds to a unique class or interface definition information, but the class or interface is not necessarily defined in a file (for example, a class or interface can also be generated directly from the ClassLoader).
Secon
The first is how to implement simultaneous inheritance of two classespublic class Multiextendsdemo {public static void main (string[] args) {//TODO auto-generated method STUBC c = new C (); C.s Howa (); C.showb ();}} Also inherit two classes class A{public void ShowA () {System.out.println ("A");}} Class B{public void ShowA () {System.out.println ("B");}}
Class Loader?? The virtual machine design team takes the "fully qualified name of a class to obtain a description of this type of binary byte stream" in the class loading phase, which is implemented outside the Java Virtual machine. So that the application can decide for itself how to get the classes it needs. The code
Class B extends A, then the type a is the parent class with static code blocks, common code blocks, static methods, static member variables, ordinary member variables, common methods.Subclasses are also like this, and then inherit the results about the printout of the program.Involves the initialization order of various members of the
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