[java]static关键字的四种用法,使用关键字static作用

import static java.lang.System.out;public class StaticTest{ public static String name = "test";//可修饰成员变量，在类加载时加载 public Integer age = 10; static{//修饰静态代码块，类加载时加载 System.out.println("======================"); //静态导入省略类名 out.println(name); out.println("static is init"); } public StaticTest(){ out.println("init constractor"); } //可修饰静态方法，可使用类名.的形式调用、或者使用对象.的形式调用 public static void testMain(){ out.println("invoke testMain"); } public static void main(String[] args) { student.main(null); } class user{ private String userName; { System.out.println("user"); } } //修饰内部类 static class student{ private String studentName; static{ System.out.println("student static"); } public static void main(String[] args) { //student stu = new student(); //System.out.println(stu.studentName); System.out.println(name); } }}