It is not too late to learn Java at the age of 30 and it is quite good. Now the development of Java on the Internet is obvious to all, and the future development is unlimited; as long as you have goals and perseverance, don’t worry about age. I'm not afraid that you won't be able to learn, but that you are too lazy to learn. As long as you have an idea, just try it. If you don't work hard, you will never know how good you are.
Previously, I saw a story about a Japanese grandmother teaching herself programming on the Internet. I was shocked when I saw this story. This old lady is very Unusually, I learned programming at home and developed a game by myself. Look how awesome it is!
If you want to find a job after learning Java, it is recommended that you learn the basics well. In the future, as long as you have a good foundation when entering the enterprise, the masters will be willing to guide you. After studying, read the Java SE, database, and Java EE interview questions several times. It will be very helpful for your interview!
Finally, don’t worry about your age. Just think that you are only 30 years old. There is still a long time to come. If you are interested in Java, try it. Try it. Simply thinking about it is of no use, take action, don’t wait until you are 70 or 80 years old to regret why you didn’t pursue your dream in the first place. Learn and live as you grow old, learn more knowledge so that you can better understand the current development situation. Is it also better? Come on!
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