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见java.lang Class Character
单个char型变量能保存的16个比特代表的Basic Multilingual Plane中,只有少数几组是CJK的比如汉字笔画和标点符号
而UTF-16采用的编码中大部分汉字都需要两个16-bit code units来表示,也就是32比特
jdk1.7开始,switch()是支持String的
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没有写清java版本,java8的新特性中关于接口新增了默认方法和静态方法
由于static Nested Class不依赖于外部类的实例对象,所以,static Nested Class能访问外部类的非static成员变量。
静态内部类无法访问外部类非static成员变量
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