大气宽屏的网站,辽阳做网站的公司,网站限时抢购怎么做,编写网站的语言有哪些获取一个类里面所有的信息#xff0c;获取到了之后#xff0c;再执行其他的业务逻辑结合配置文件#xff0c;动态的创建对象并调用方法 练习1#xff1a; public class MyTest {public static void main(String[] args) throws IllegalAccessException, IOException {Stude…获取一个类里面所有的信息获取到了之后再执行其他的业务逻辑结合配置文件动态的创建对象并调用方法 练习1 public class MyTest {public static void main(String[] args) throws IllegalAccessException, IOException {Student s new Student(小A, 23, 女, 167.5, 睡觉);Teacher t new Teacher(播妞, 10000);//调用方法upload(t);}private static void upload(Object obj) throws IllegalAccessException, IOException {//1创建字节码文件Class? clazz obj.getClass();//2.创建io流BufferedWriter bw new BufferedWriter(new FileWriter(..\\reflect\\a.txt));//获取所有成员变量Field[] fields clazz.getDeclaredFields();for (Field field : fields) {//暴力反射因为成员变量有可能是私有化field.setAccessible(true);//获取变量名String name field.getName();//获取变量在对象中记录的值Object value field.get(obj);//写入文件bw.write(name value);bw.newLine();}bw.close();}
} 练习二 //Student
public class Student {private String name;private int age;public Student() {}public Student(String name, int age) {this.name name;this.age age;}public void study(){System.out.println(学生在学习);}//set、get、toString
}
//Teacher
public class Teacher {private String name;private double salary;public Teacher() {}public Teacher(String name, double salary) {this.name name;this.salary salary;}public void teach(){System.out.println(老师在教书);}// set、get、toString
}//main
public class Test {public static void main(String[] args) throws IOException, ClassNotFoundException, NoSuchMethodException, InvocationTargetException, InstantiationException, IllegalAccessException {//1.获取properties文件内的数据Properties prop new Properties();FileInputStream fisnew FileInputStream(..\\reflect\\Info.properties);prop.load(fis);fis.close();System.out.println(prop);//{methodstudy, classNamereflectDemo.Student}//根据键获取值String className (String) prop.get(className);String methodName (String)prop.get(method);//根据全类名获取class文件对象Class? clazz Class.forName(className);//反射获取构造方法创建一个对象oConstructor? constructor clazz.getDeclaredConstructor();Object o constructor.newInstance();//反射获取方法参数是方法名Method method clazz.getDeclaredMethod(methodName);//因为不知道方法是不是私有化所以暴力反射method.setAccessible(true);//传入对象运行当前方法method.invoke(o);//学生在学习}
}
准备一个info.properties文件,以键值对的形式存储以后若要运行其他类里面的方法在文件内修改数据即可将文件修改为如下再次运行
总结
