The JDK is the Java Development Kit, which means the toolkit required for Java development. With this thing, all Java development is theoretically not a problem. Of course, depending on the version you download, there may be different areas of expertise. Usually we use the JDK to develop javase applications.
In practice, the JDK contains the Javac command to compile the source code, and the Java command to execute the bytecode. As long as you have set up the path and classpath of the operating system you are using, and you are working with the Java source code of the text format you are writing, in principle there will be no errors other than coding problems. But because Javac and Java commands are command-line commands, execution and results viewing are a bit cumbersome. What's more troubling is the dynamic debugging of the code (that is, running and looking at each step).
Eclipse is an integrated development environment that solves the problem of command execution and operation that is troublesome. With this tool, if you don't do anything special, you don't have to worry about how the Javac and Java commands are used, what the parameters are, how the various environment variables are configured, and so on. Just follow the tutorial to learn how to use the tool, you can easily write your code, and then compile, execute and Debug.
Moreover, the code will be written with a lot of hints, not to remember the various classes of the complex method names and so on.
It is also because of its convenience that it will affect your learning of Java-related commands and the mastery of common classes to a certain extent. Repetition, after all, is the best way to strengthen memory. What all hints, all automatic, it is difficult to remember.
That's why someone objected to your first use of the tool.
Transferred from: https://www.zhihu.com/question/20218920
The relationship between JDK and integration development tools such as Eclipse
