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used.This is what we don't want to see. Why can't these jobs be transparent without changing the client code? The answer is yes. The following shows the modified implementation code: 1 Class A 2 { 3 Public : 4 A ( Int X): x (x) 5 {67} 8 ~ A () 9 {1011} 12 Public : 13 Int Getx () Const 14 {15//Log16ReturnX*X;17} 18 Private : 19 Int X; 20 } ;
Java Tour (iv)-object oriented thinking, member/local variables, anonymous objects, encapsulation, private, construction methods, building blocks of code
Come on, it's going to be a little faster.
1. Overview
This is the length of the story, which focuses on the thought and the case
Take the buy computer, first, you do not understand th
First, instance variablesAlso called an object variable, a class member variable, the storage space is allocated when the object is generated from the class, and the instance variables between the objects do not interfere with each other, and the instance variables can be accessed through the object's reference. Howeve
Java main class M can directly access its own private members, even if the new one in main itself, is only a local variable in its own static method, the local variable can still access its own private members, as long as the local variable body in its own class M.The other
Java Reflection _ A simple example of changing the variables and methods in private
Class demotest{
private String name= "123";
Public GetName () {
System.out.println (' public getName ' + name);
return name;
Private
We all know that the private variable is inaccessible, and a compile error can not be accessed at all. This article teaches you how to crack this limitation.The principle of implementation is to take advantage of the reflection mechanism of java.The simplest class is defined first, with only one private variable and one public method. The code is as follows:
There are generally three variables in Java: Class variables, member variables, and local variables. class variables1. Let's look at the following example for a
does not define final, then when the outer class method executes, The local variable must be gc, but a method of the inner class has not been executed, and the external variable that he refers to cannot be found. If defined as final,java, this variable is copied as a member variable inside the inner class, so that the
class method can be called by all pairs, and can be called with the class name . class method or object name. class Method . Instance methods can only be called with object names. It is important to note, however, that class methods cannot invoke instance
Class variables, class methods, instance variables, and instance methods in javaBefore understanding the class variables and class methods, read the following code:Class person {int age
The scariest thing is not to make mistakes, but to never find them, until now I know I have a problem with the understanding of class variables.Maybe it's probably because of the less common class variables that haven't been identified . I recently saw C + + to know what the class variable in the end is what ?I've alwa
If you frequently access variables, you need to consider where to access them. Is the variable static, stack, or instance variable of the class? Does the storage location of a variable significantly affect the performance of the code that is accessed? For example, consider the following code: Class stackvars
{
Private
In the Java development phase, because of the pursuit of architectural specifications and follow the design principles, so to use the private and protected modifiers to define the class member methods, variables, constants, which makes the code encapsulation, cohesion, etc., but in the testing phase will cause some inc
Recently learned to inherit, from the book to see the subclass inherit the parent class, the subclass has all the parent class properties and methods, and then use the program to verify that the parent class's private properties and private methods, the subclass is inaccessible, of course, some of the parent's
(5) package-related
Class: Use the class keyword to create a new class.For example:Class aclassname{Class body goes here}The words modifying class include public, abstract, and final. abstract and final cannot simultaneously modify class. Internal classes can also be modifie
4.1 Object-oriented basic 4.1.2 Object-oriented features 1. Encapsulation 2. Inheritance 3. Polymorphism 4.2 The definition of class for Java class and object 4.2.1 class includes the definition of class declaration and class body
Generally, Private member variables of the java class cannot be directly accessed. If you want to access a private member variable, you need to write an access method getXXX () to this variable (). If the access method is not defined, we seem helpless. In fact, we can use th
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