Soft test path-j2se, from helloworld to pass the world code

The "Hello World" program refers to outputting "Hello, world!" only on the computer screen !" ("World, hello !") The computer program of this line of string. Hello world, as the initial stage of all programming languages, occupies an unchangeable position. All Chinese/English/French/German/American ...... In the version programming textbooks, Hello world is always recorded in books as the first test. This is the first step in all programming! Classic in classic! Hello world!

Preparing for the soft exam refers to the fact that it has been half a month, and half a month, Ma's j2se video has been passed in a hurry, during which the xisai video is in progress, after watching the j2se video, I have to summarize it, right? In this way, I can sum up the learned knowledge or prepare for the soft test, leaving behind a series of skewed footprints, j2se is used to help us get familiar with Java syntax, because in the afternoon of the soft exam, the design pattern is written in Java. Java is very tall. Is there any? A Brief Introduction: the Java2 Platform includes three versions: Standard Edition (j2se), Enterprise Edition (J2EE), and miniature edition (j2se. J2se, j2-and J2EE, which is the SunONE (Open netenvironment) system. J2se is the standard version of Java2 and is mainly used for programming desktop application software. j2se is mainly used for embedded system development, such as mobile phone and PDA programming. J2EE is the Enterprise Edition of Java2, it is mainly used for the development of distributed network programs, such as e-commerce websites and ERP systems. Next we will make a small Summary of j2se learning, such:

Compared with VB we have learned before, VB is a process-oriented language. It is based on objects and does not support overloading, interfaces, inheritance, etc. Java is an object-oriented language, supports object-oriented features. Another important thing is memory analysis, which is another characteristic of Java. Java memory analysis includes the Program Execution Process, program variables, and object storage location. It is an important basis for a deep understanding of code lookup. For example:

A Brief Introduction: memory is divided into four areas. It can be divided into heap-heap, stack-stack, datasegment-data segment, and code segment-code segment. After learning j2se, I have a better understanding of object-oriented. I feel like I have known each other about this part of learning, and I have applied for C ++, the content of this section is even more like the feeling of a loved one. C # And VB.net lay the foundation for comparative analysis and realize that object-oriented in Java is always a change in some keywords.

Summary: Throughout the j2se video, I mainly explained three major parts: Basic Java syntax, object-oriented, and basic class applications. First, I talked about the basic syntax and basic syntax of Java, an unfamiliar topic in all languages, an important knowledge point, and memory analysis. In the face-to-face object, programming is to solve the problem, and three aspects to solve a problem are the categories and methods and attributes of the classes, the relationship between classes. This is the idea of object-oriented programming. It is simple, but the real idea requires us to cultivate it slowly. The object-oriented part is also based on the object-oriented features-encapsulation, inheritance, polymorphism, and finally, basic class applications, exception handling, containers, guis, Io streams, network programming, multithreading, it is strongly recommended that you view the API documentation. The test is in progress and will not be resumed ......

Soft test path-j2se, from helloworld to pass the world code