what constructor method

Construction method 1.1 Construction Method Introduction First of all to understand the difference between the construction method and the general method:The construction method executes when the object is created and executes only once.The general

What is a construction method? A constructor method is called whenever an object is instantiated. The following points should be noted in the construction method:-The name of the construction method must be the same as the class name-the declaration

Class Person { The following is the person's member property var $name; The name of the man var $***; Man's Sex var $age; The age of the person The following is a member method of the person function

1. Three systems in Java Javase (J2SE) (JAVA2 Platform standard Edition,java platform version) EE (Java 2 platform,enterprise Edition,java Platform Enterprise Edition) Javame (J2ME) (Java 2 Platform Micro Edition,java Platform mini

1. If no construction method is defined inside the class, a default parameterless construction method is added. Class thisclass{}By default, the implicit addition of an parameterless construction method is equivalent toClass thisclass{public

The inner classes in Java are divided into four: member Inner class Static Inner class Local inner class Anonymous inner class 1. member Inner class:Defined inside another class (outer Class), and with member methods and

This article address: http://www.cnblogs.com/archimedes/p/java-study-note4.html, reprint please indicate source address.1. Object initialization and RecyclingObject initializationWhen the system generates an object, it allocates memory space for the

A constructor method is a special method in a class that initializes an instance variable of the class, which is automatically called after the object is created (the new operator). The Java construction method is characterized by the following:

For example, the question:1 classfu{2 Static {3System.out.println ("This is a static code block for the parent class");4 }5 {6System.out.println ("This is the parent class construction code block");7 }8 PublicFu ()

A small summary of basic Java knowledgeIn a separate primitive program, there can be only one public class, but there are many non-public classes.In addition, if no class is public in a Java program, the Java program's file name can be arbitrarily

1. A class is an abstract concept in which an object is a concrete representation of a class and is a concrete concept. There is a class first and then the object is generated by the class. The object is also called an instance (Instance). 2. The

1. When the virtual machine loads the Java class for the first time, it initializes the static initialization block, the static member variable, and the static method once.2. An instance of the class is created only when the new method is called3,

First, the object-oriented core mechanism-dynamic binding, also known as polymorphic　　1.1. Use the following example to understand dynamic binding, which is polymorphic 1 package javastudy.summary; 2 3 class Animal {4/** 5 * Declares a private

GitHub Address: objects and classes in Https://github.com/lily1010/java_learn/tree/master/dogjavaAll things in Java are objects, such as animals, cats, dogs, fish and so on, they can run, can breathe, in short, they have some common characteristics

Objective-C learning 03-inheritance, objective-c03 inheritanceOutline:Basic concepts of InheritanceCustom Initialization MethodConstructor MethodOverride description   1. inherit Basic Concepts The objects in the program are the same as those of

The This keyword must be placed in a non-static methodThe This keyword represents itself, and the main uses in the program are the following:? Referencing member variables using the This keyword? Use the This keyword to refer to other construction

1. Subclasses after the instance is created, the class initialization method calls the parent class's initialization method (except for the Java.lang.Object class, because the Java.lang.Object class does not have a parent class), and the call is

The This keyword must be placed in a non-static methodThe This keyword represents itself, and the main uses in the program are the following:Referencing member variables using the This keywordUse the This keyword to refer to other construction

Java Object-oriented classesA collection of a series of objects with the same properties and methods, which is a description of the object. The inner part of the class includes properties and methods two parts.A class is a template for creating

In a separate primitive program, there can be only one public class, but there are many non-public classes.In addition, if no class is public in a Java program, the Java program's file name can be arbitrarily named.Document comments, which start