Unresolved compilation problems: No enclosing instance, Private method from the class is not visible, this$0 cannot be resolved.
解决问题：不编制封闭实例，从类的私有方法是不可见的，这0美元是不能解决的。
To preserve this functionality, the refactoring will add an instance of the enclosing class BagExample to the formerly nested class.
为了保留这种功能，重构过程将一个装入类BagExample的实例放在前面那个嵌套类中。
Referring to enclosing type parameters inside static methods and static inner classes is prohibited outright by the compiler. So, for instance, the following code is illegal in tiger.
编译器完全禁止在静态方法和静态内部类中引用封闭类型参数。
The first set of enclosing braces delineates the construction of an anonymous inner class, and the second set delineates the instance initializer for the anonymous inner class.
第一组闭合括弧划定一个匿名内部类的构造，第二组划定匿名内部类的实例初始化语句块。
The first set of enclosing braces delineates the construction of an anonymous inner class, and the second set delineates the instance initializer for the anonymous inner class.
第一组闭合括弧划定一个匿名内部类的构造，第二组划定匿名内部类的实例初始化语句块。
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