How to solve problems when creating classes in Java EE?

I have been busy taking the driver’s license test this semester, and it’s almost the end of the semester. The last big assignment of my college life is coming soon. To be honest, this semester is really not as hard as the previous two semesters. I don’t know if it’s because I’m about to graduate or if I’m really thinking about my driver’s license. I thought about getting my driver’s license before this summer vacation. Today, I really realized it. I can finally leave school without any worries. Internship work is over. In the past few days, my family has been thinking about taking the teacher qualification certificate before leaving school, but I really have no intention of becoming a teacher. I still feel that doing development can give me a sense of accomplishment, although it will be a bit difficult if I encounter difficulties and cannot solve them. The heartbreaking kind, but once the problem is solved there is a great sense of accomplishment. Looking back, the difficulties we encountered before are nothing. Today is my first day of new development. I haven’t sat down and watched a video for so long. Today, for the first time, Baidu did not try to solve the problem of installing development software. After the accumulation of previous studies, I got started quickly this time when I started again. Despite this, I am still a little timid about finding a job. No matter what, you must do something to show your family that you have grown up. You can stand alone.

When I was developing my own new software, something suddenly popped up when I created the Class class. Following the same steps as in the video, I would write one sentence as he wrote. But it still didn't work. Later, Baidu modified it according to the above solution and solved it. In order to make myself remember it longer, I decided to write this question down so that I can remember it deeply and let friends who follow me refer to it.

　 Solution: Load the java class library, right-click on the project and select Properties->Libraries of Java Build Path->Add Library and select JRE System Library->Click Next->Select Execution environment and select version or workspace default jre->Click Finish.

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