The Java ramble on Big Data (I.)

 Public class  publicstaticvoid  Main (String[]args) {  System.out.println ("ABC" );}}

development is inseparable from the program
program: A collection of sequential instructions
Command: An order issued when the computer executes the idea of a person
Big Data development should be based on a high-level language
First,languageThis piece, as we all know,
Computer languages include: machine language, assembly language, high-level languages.
Machine language: Made up of 01
Assembly language: Writing programs with mnemonic characters
High-level language: is the most close to the human language of computer language, using People's common text to write programs
Common high-level languages: Java,c,c++,c#,javascript,vb.net,python,php,r,perl, etc.

AgainPlatform, may be different machines, are different operating systems
Operating System: There are dos,windows,unix,linux, etc.
the biggest feature of the Java language: cross-platform.
Java installation and environment configuration is skipped.
implementation of Java programs
In fact, Java program is the embodiment of human thought and needs, the implementation of Java is like opening a file, different operating systems have different open way, but the principle is interlinked, its constant thinking is
Java source Code (*.JAVA) >>> compiled by compiler bytecode (*.class) >>> interpreted by interpreter for machine code
There are many DOS commands in a DOS operating system, which is the same as mouse clicks in Windows-releasing commands to achieve their desired results.
A series of commands to open Java and get results is the realization of the computer's vision of meeting human needs.
Java Authoring
Like many languages, to be able to realize the human mind, but Java is object-oriented, involving classes, not only the idea of the process to the class transformation, is to write to consider the class, in this, provide its basic specification: (see article code)
The first line above represents the class, the second line represents the method, the third line represents the specific statement, here is the output statement
public--Common, class--definition class, hello--class name, static--static, void--no return value, main--Main method name, string--string, []--array, args--array name, system--class, out--object, println--method
Both the main method and the method () are the parameters

This concludes today.

The Java ramble on Big Data (I.)