java代码块 学习

class Student {
            static {
                System.out.println("Student 静态代码块");
            }

            {
                System.out.println("Student 构造代码块");
            }

            public Student() {
                System.out.println("Student 构造方法");
            }
        }

        class Demo2_Student {
            static {
                System.out.println("Demo2_Student静态代码块");
            }

            public static void main(String[] args) {
                System.out.println("我是main方法");

                Student s1 = new Student();
                Student s2 = new Student();
            }
        }