After following, you can keep track of his dynamic information in a timely manner
Courses in the relevant section：Student use
void 修饰的方法可独立调取
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Courses in the relevant section：Use of mobile phones
方法赋值-----类名.方法名（数值）;
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Courses in the relevant section：Overview and applications of anonymous objects
1.匿名对象格式:new 类名（）;----相对于创建一个新的对象。 2.匿名对象掉方法只调一次，调完就被垃圾回收站回收，存在于栈内存中。
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