Fix singleton classes #100
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修正单例类的实现方式, 确保只会存在一个实例.
值得注意的是因为这些类全部没用使用 final 修饰, 所以我假设都可能被继承. 构造函数的访问限定符为 protected, 如果不会被继承的话最好使用 final 修饰并把构造函数的访问限定符改为 private.