面向 Java 初学者 ｜ 配套可运行演示：javase-demo/（7 个程序 + JUnit 测试，全部实际编译运行） 本版在原有基础上做了两件事：基础化（每个知识点从"为什么"讲起，配人话解释）+ 全面化（补齐大 ...
A Java console application that registers a user and logs them in. All validation rules live in the Login class so that they can be tested independently of the user interface, which is why the ...
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