I feel that when I used to analyze how I should choose, I would regret it no matter which one I chose, but I just regretted that I didn't choose anything. At first I regretted not choosing php, and later I regretted not choosing java. Originally, my idea was to be simple and do what I want to do best. For example, I used to like php, but the web front-end became popular after I was promoted to undergraduate. php is a bit outdated, but java is still quite popular. Now I remember which one I want to choose. Java or web front-end or php, I think Java is relatively stable, but it is too difficult, which is a bit contrary to my original intention. Php is not popular. What if you can't find a job after elimination? So I have to choose between php and web front-end. After all, it feels simpler than java. The idea is whether there is a programming language that has been popular from junior college to undergraduate, so that all junior college students can learn without faults. Now it seems that only java is like this. But only now, I don't know that java will be popular until I go to college. After all, there was no java fire in c# and php at that time. Moreover, java is difficult and risky, so if php is popular in junior college, you can learn php in junior college. If php is not popular after undergraduate course, web front-end can also be used, which is simpler than java anyway. And even if junior college students learn php, there won't be much conflict. Php courses also include knowledge of web front-end. Most importantly, they are all simpler than java. There is no need to say that junior college students and undergraduates should mainly learn the same programming language, and at that time, I don't know what programming language will always be popular. Now you dare not say that java will not be eliminated in the future? Is it ok to convert php into web front end? Just like a lot of java is leaving now. Now everyone wants to analyze which one should be the most suitable before. I just feel that if I like choosing java, I regret not learning java. If I like to choose php, I regret not training php. I regret it anyway. I just want to know what regret is.