public class Student {private static int age;//静态的变量private double score;//非静态的方法public void run(){}public static void go(){}public static void main(String[] args) {new Student().run();Student.go();}
}

public class Person {//2 ： 赋初始值{System.out.println("匿名代码块");}//1 : 只执行一次static{System.out.println("静态代码块");}public Person(){System.out.println("构造器");}//3public static void main(String[] args) {Person person1 = new Person();System.out.println("=====================");Person person2 = new Person();}}

//静态导入包
import static java.lang.Math.random;
import static java.lang.Math.PI;public class Test {public static void main(String[] args) {System.out.println(random());System.out.println(PI);}}