this 代表什么
this 应用场景
When used as a primary expression, the keyword this denotes a value that is a reference to the object for which the instance method or default method was invoked , or to the object being constructed. The value denoted by this in a lambda body is the same as the value denoted by this in the surrounding context.
注意点：
this 是对象的引用
The keyword this may be used only in the following contexts:
原文：http://www.cnblogs.com/zno2/p/5611296.html