Hello Java!

I have no good understanding of the nature of computer programming, but Kung Fu is not willing to listen to the heart, recently learning video lessons, always pay attention to Lou Teacher's blog, slowly for Java programming has a new understanding, but also with the Eclipse software for simple Java compilation.

Understanding of the compilation platform, I will be based on learning to understand the relationship between the three, the JVM is the meaning of the Java Virtual machine, the. class file to run, or the system can not directly run. This book also emphasizes its importance, emphasizing that "the JVM is the only operating system known to the Java program, and its executable file is a. Class document" important concept. The JRE refers to the Java operating environment, that is, Java program to execute, always have a suitable environment for it, like C language, the same needs the environment, it is impossible to simply execute them. The JDK contains some Java language development tools, so you must install the JDK in order to develop Java programs.

The next step is to open the software for a simple Hello Java compilation.

After opening the software, a new Hello Java project file was created, and then the ABC class file was built in its directory. After that, the code was struck according to the code in the book.

Because I've only studied Java video at Geek College before, I know system. Out. println () is an output function, I entered, but click Compile discovery is a failure, the system has a red logo, and then I took a serious look at the video, found that the first letter of the output function should be capitalized, I corrected it, and the compilation has been successfully passed.

This is the first small Java code, small achievements, I hope that the future of Java will be more great.

Hello Java!