superclass java

value of the super_class item is 0, the class file must represent the java. Lang. Object Class. If the value of the super_class item is not 0, there are two cases. If the class file represents a class, then, the super_class item must be the index of the constant_class_info table item of the class in the constant pool. This superclass and any of its superclasses cannot be a final class. If the class file re

them to default values; Parse: Converts a symbol reference in a type to a direct reference) Initialize (class variable initialized to correct initial value) 2.3 Method AreaIn a Java virtual machine, information about the loaded type is stored in memory in a method area. When a virtual machine mounts a type, it uses the class loader to locate the appropriate class file, then reads the class file and transfers it to the virtual machine, and th

:c.show () =" +c.show ()); Output: 3:a.show () =c/* * When a superclass invokes an object of its subclass by declaring a reference variable (which is more appropriate to refer to it as a reference to an object), the method it calls must be a method of the subclass owned in the superclass. * 4 the variable AB is declared by a, refers to the object of B, so Ab.show () is called the Show () method in Class B,

Pseudo-sharing and cache row filling, from Java 6, Java 7 to Java 8, java There are already a lot of articles about pseudo-sharing. For multi-threaded programming, especially when processing lists and arrays with multiple threads, you should pay attention to the issue of pseudo-sharing. Otherwise, the multi-thread perf

Java Chinese garbled solution (4) ----- java coding conversion process, java ----- java The first three blogs focus on character encoding. Through these three blogs, you will have a preliminary understanding of various character encoding methods, to understand the Chinese language of

, so it is necessary to explicitly call the constructor method of the superclass in the constructor method of the Subclass.　　Next Example: class C extends a.b {c () {new A (). Super ();//this sentence implements a call to the Inner class constructor method.　　}} The constructor method can also be written like This: C (a a) {a.super (); }//use This construction method to create the object to be written as C C = new C (a); A is the object of A.11 Excepti

several abstract methods, the class must be declared as an abstract class. Abstract classes can not contain abstract methods. The declaration of an abstract method ends with a semicolon, for example, public abstract sample (); Instance: Public abstract class SuperClass {abstract void m (); // abstract method} class SubClass extends SuperClass {// implements the abstract method void m () {.........}}Synchro

behaviors of the class. Is it a strong coupling or a virtual coupling? Is it an inheritance or a combination of relationships (IS-A,HAS-A)?With 1-5 working experience, in the face of the current popular technology do not know where to start, need to break through the technical bottleneck can add group. Stay in the company for a long time, have a very comfortable, but job-hopping interview wall. Need to study in a short period of time, job-hopping to get a high salary can add group. If there is

JRE.In Java, which class is the superclass of all classes? Java. lang. Object is the root class of all classes, and we do not need to inherit it from the display.Why does Java not support multiple inheritance? Java does not support multiple inheritance because of the "diamo

classes that meet the requirements of an interface. It takes 2 steps to implement an interface: 1. Declares the specified interface that the class needs to implement. 2. Provide definitions of all the methods in the interface. Declaring a class implementing an interface requires the use of the Implements Keyword Class ACTIONB implements comparable its actionb needs to provide a CompareTo method, the interface is not a class, and an interface cannot be instantiated with new. 25. A class has on

the class needs to implement.2. Provide definitions of all the methods in the interface.Declaring a class implementing an interface requires the use of the Implements keywordClass ACTIONB implements comparable its actionb need to provide a CompareTo method, the interface is not a class, you cannot instantiate an interface with new.25. A class has only one superclass, but a class can implement multiple interfaces. An important interface in

public void Manager (int no,string name, double salary,double reward) {this . no = no; this. Salary = salary; this. Name = name; this. Reward = Reward; }}The manager class inherits the employee class, so it inherits the employee's member variable, but the manager itself does not have the No,salary and name attributes, and the three properties of the employee are private and cannot be called by any class other than itself. Even if it's a subc

The examples in this article describe the construction methods in Java inheritance. Share to everyone for your reference. Specifically as follows: How to construct in inheritance: 1. The construction method of the base class must be called during the construction of the subclass. 2. Subclasses can use Super (argument_list) to invoke the constructor method of the base class in their own constructor methods. 2.1. Use this (argument_list) to invoke a

often referenced. Metadata provides a useful method to indicate whether a method depends on other methods, whether they are complete, whether a specific class must reference other classes, and so on. This is indeed very useful, but for Adding metadata to the Java language, the documentation may beLeastRelated reasons. Javadoc provides easy-to-understand and robust methods to document code. In addition, who else needs to write a document preparation t

"Go" Java Improve (ii)-----Understanding the inheritance of three major features of JavaOriginal address: http://www.cnblogs.com/chenssy/p/3354884.htmlIn "Think in Java" There is a sentence: Reuse code is one of Java's many compelling features. But to be a revolutionary language, it's not enough to just copy the code and change it, and it has to be able to do more. The most noticeable in this sentence is th

the compareto method. The interface is not a class and cannot be instantiated using new. 25. A class has only one superclass, but a class can implement multiple interfaces. An important interface in Java: 26. interfaces and callbacks. A common programming mode is the callback mode. In this mode, you can specify the method on the callback object when a specific time occurs. Example: actionlistener interface

Java basic notes (1) JAVA's historical Java Build Environment, java build In addition to setting up, this article focuses on reading novels and reading them. If you don't want to read them, you can grasp the focus directly. I will change the color to indicate the focus! English is one of the most important ways for people to communicate with each other.

10 most popular Java classes (conversion) and 10 popular java classes Original article: http://www.csdn.net/article/2012-06-04/2806277 Every Java programmer has his/her own Java class table. This table does not have strict rules or rules to follow. It depends entirely on the Java