public private protected

One, pack (package)1.package:Why is the package required?To resolve the problem of duplicate names between classes.For ease of management class: The right class is located in the appropriate package!How does the package work?is usually the first non-

JavaWhat is 1.GC? Why do you have a GC? GC is the meaning of garbage collection (Gabage Collection), memory processing is where programmers are prone to problems, forgetting or wrong memory recycling can cause program or system instability or even

Base class Access Class inheritance Mode Sub-category access permissions Public Public Protected Public Protected Private

1. Objects(1) Everything is an object.(2) program is a combination of a lot of objects(3) Each object has its own storage space to accommodate other objects(4) Each object has a type, "Class" and "type" are synonyms, and the most important feature

1: Beginners Java, all know that Java is Object-oriented programming. The author begins this section by talking about classes and objects. (Example for reference only, if copy and paste remember to modify the package name and class name, to avoid

What is an object?Everything objects, objects due to concern and produce!!!Class and object relationships?1, the class is an abstract object, the object is an instance of the Class!2. A class is a set of objects that have the same properties and

Original address: https://qunxinghu.github.io/2016/09/12/C++%20%E4%B8%89%E5%A4%A7%E7%89%B9%E6%80%A7%E4%B9%8B%E7%BB%A7%E6%89%BF/Basic conceptsInherited: The inheritance of classes is that the new classes get the existing features from existing

A constructor is a block of code that initializes an object immediately after the object is created. The structure of the constructor looks similar to a method.declaring constructorsThe general syntax for a constructor declaration is:

First, identifiersDefinition: The naming mark used when naming individual elements in a program is called a marker.Basic composition: Consists of numbers, letters, underscores, dollar signs ($). It is not possible to start with a number. For example:

　　PEP8 Python Coding Specification Collation 07/17. 2014 Decided to start the Python road, using spare time, for more in-depth study of Python. Programming languages are not art, but work or tools, so it is necessary to organize and

　　　　1. Java variable type: member variable, local variable, static variableModifier public, private, protected, default can only modify member variables, cannot decorate local variables.Private, protected cannot be used to modify classes, only

Original: http://www.javaworld.com/article/2077372/learn-java/static-class-declarations.htmlTo understand the use of the static keyword in a class declaration, we first need to understand the class declaration. There are two kinds, one is top-level

PEP8 Python Coding Specificationa code Orchestration1 indent. Indentation of 4 spaces (the editor can do this), no tap, no mix of taps and spaces. 2 The maximum length per line is 79, the line break can use backslashes, preferably with parentheses.

PEP8 Python Coding SpecificationA code orchestration1 indent. Indentation of 4 spaces (the editor can do this), no tap, no mix of taps and spaces.2 The maximum length per line is 79, the line break can use backslashes, preferably with parentheses.

a daily sentence: Life is full of expectations, the dream of connecting the future! Java fresh or self-taught beginner's written interview topic summary, I hope that everyone has help, the topic from their own learning summary and teacher

A code orchestration Indent. Indentation of 4 spaces (the editor can do this), no tap, no mix of taps and spaces. The maximum length per line is 79, the line break can use backslashes, preferably with parentheses. The newline point is

1. Knowledge Point 1.1 macro definition(1) macro definition without parameters1 #define error_message-1002#define seconds_per_day 60*60*60(2) with the parameter macro definition, this form is called the macro function, but actually is not the

1. interface: interface is to give some methods without content, encapsulated together, to a class to use, in accordance with the specific circumstances of these methods written. Interfaces are abstract classes that are more

1. Colon (:) usage(1) Represents the definition of a bit field within a mechanism (that is, the variable occupies several bit spaces)typedef struct _xxx{ unsigned char a:4; Char character a accounts for 4 bits unsigned char c;

1. Behavior of the object: (1) method call Stack: All method calls are maintained in a structure called the call stack.The first method called is main (), which is called by the JVM, so the main () method is always at the bottom of the call stack.(2)