java this
this 代表什么
this 应用场景
https://docs.oracle.com/javase/tutorial/java/javaOO/thiskey.html
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.
Within an instance method or a constructor, this is a reference to the current object — the object whose method or constructor is being called.
You can refer to any member of the current object from within an instance method or a constructor by using this.
你可以在实例方法或构造器中通过使用this来指明当前对象的任意成员。
语法：
He did not refer to the report from Australia.
注意点：
this 是对象的引用
The most common reason for using the this keyword is because a field is shadowed by a method or constructor parameter.
The keyword this may be used only in the following contexts:
