I have mastered the basic grammar of Java. What should I study from now on? I would like to recommend it to those who say ["Introduction to Java that you can understand clearly"](https://www.amazon.co.jp/%E3%82%B9%E3%83%83%] E3% 82% AD% E3% 83% AA% E3% 82% 8F% E3% 81% 8B% E3% 82% 8B-Java% E5% 85% A5% E9% 96% 80-% E5% AE% 9F % E8% B7% B5% E7% B7% A8-% E7% AC% AC2% E7% 89% 88-% E3% 82% B9% E3% 83% 83% E3% 82% AD% E3% 83% AA % E3% 82% B7% E3% 83% AA% E3% 83% BC% E3% 82% BA / dp / 4844336770 / ref = sr_1_fkmrnull_1? __mk_ja_JP =% E3% 82% AB% E3% 82% BF% E3% 82% AB% E3% 83% 8A & keywords = Java +% E5% 85% A5% E9% 96% 80 +% E5% AE% 9F% E8% B7% B5% E7% B7% A8 & qid = 1555425436 & s = gateway & sr = 8-1 -fkmrnull). I'm currently engaged in resident dispatch-type work at SE as a Java engineer, but in the field where I work in Java, there is usually tacit knowledge like "Do you know?" It's this book that I personally think this is well organized.
Looking at this book here, what is it really? I would like to describe such things as I study. And on this page, I will put up links as appropriate so that I can control the whole.
・ Character string concatenation: Which is really fast and light championship (under construction) ＝＝TOBE CONTINUE==
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