如果遇到 this. 什么, this. 前面没有static , 就是需要 实例化, new 一个对象,才可以. 在调用这个方法之前一定会先创建对象. 先找构造方法/函数. 逆向时候遇到, 可能是当前类的实现, 也可能是当前类的子类的实现. 多长个心眼. 5, 接口, 无任何实现 + 约束\"实现\"他的类必须包含的成员 + 泛指 实现他的类创建的对象. + 类可以实现多个接口.  

The people in the back, can you hear me clearly? OK, good. Have you ever held a question in mind, for so long that it becomes part of how you think? Maybe even part of who you are as a person? Well, I\'ve had a question in my mind for many, many years, and that is: How can you speed up learning? Now, this is an interesting question, because if you speed up learning, you can spend less time at school. And if you learn really fast, you probably wouldn\'t have to go to school at all. Now, when I was young, school was sort of OK, but. . . I found quite often that school got in the way of learning. So I had this question in mind: How do you learn faster? And this began when I was very, very young, when I was 11 years old, I wrote a letter to researchers in the Soviet Union, asking about hypnopaedia. This is sleep-learning, where you get a tape recorder, you put it beside your bed, and it turns on in the middle of the night when you\'re sleeping, and you\'re supposed to be learning from this. A good