Problems with creating a class in a large Java EE job ------- Implicit super constructor Object () is undefined for default constructor. Mu, implicitconstructor

Problems with creating a class in a large Java EE job ------- Implicit super constructor Object () is undefined for default constructor. Mu, implicitconstructor

This semester has been busy with the driver's license test, and it is about to end. My last big job in college is coming. To be honest, this semester is really not as hard as the previous two semesters. I don't know whether it is because I am about to graduate or I am actually using my driver's license. I want to get my driver's license before this summer vacation. This is what I did today, finally, you can leave the school to find an internship. In the past few days, I have been thinking about leaving the school after passing the instructor qualification certificate. But I really don't want to be a teacher. I still feel that developing can make me feel a sense of accomplishment, although the problem cannot be solved, it will be a little sad, but once the problem is solved, it will have a great sense of accomplishment. Looking back at the previous difficulties is nothing. Today is my first day to start new development. I haven't sat down to watch the video for so long. For the first time today, Baidu did not try to install and develop software. After the accumulation of previous studies, I started to get started soon. Despite this, I am a little timid about finding a job. No matter what you do, make sure your family has grown up. You can stand alone.

When I used my new software for development, the Class was suddenly red when I created it. Following the same steps of the video, he wrote a sentence and I wrote a sentence. However, it still won't work. Baidu then changed the solution and solved the problem. I decided to write down this question to impress myself so that I could have a long memory. I also gave my friends a reference.

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