Self-study Java. If you feel that you read the "Bible" such as "Java Programming Thought" or "Core Java" and feel too much content, if you can't understand it all at once, you might as well take a look at this "Java Basic Core" PDF brochure. The content is short and concise, including a condensed summary of the basic knowledge of Java.
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The specific content starts from the Java development environment, to the most basic syntax, interfaces, exceptions, internal classes, collections, generics, reflection, I/O..., almost covering the basic knowledge of the Java language, just cut a few pictures have a look.
