21天学会java讲的一些的基本的 JAVA知识,对出学者非常有用.一些在学习初期没有学好的同学,绝对可以通过自己的努力去学好JAVA-About 21 days, learn java JAVA some basic knowledge of the scholars is very useful. Some of the early learning students do not learn, definitely through their own efforts to learn JA