201671010115 Java 2016-2017-2 Java program for the third week

Through the third week of study, I learned about the object and class in the Java language this piece of knowledge point.

Java is an object-oriented programming language, object-oriented programs are composed of objects, classes (Class) is a template or blueprint for constructing objects, so learning objects and classes is very important.

With regard to the use of objects and classes, if you want to use an object, you must first construct the object, specify its initial state, and then apply the method to the object. The class body consists of two aspects, that is, the instance domain (the data in the object) and the method (the process of manipulating the data). Between an object and an object variable, an object variable does not actually contain an object, but simply refers to an object. Master the basic usage of predefined classes and familiarize yourself with the common APIs for the math class, the string class, and the scanner class.

This week's study a little difficult, although read in advance textbooks and courseware, but some knowledge is not too understand, sometimes feel the teacher mentioned a knowledge point, I like not seen, may be still a bit not adapt to it.

201671010115 Java 2016-2017-2 Java program for the third week