反射-通过反射写一个通用的设置某个对象的某个属性为指定的值

package cn.itcast.test;import java.lang.reflect.Field;public class Tool {public void setProperty(Object obj, String propertyName, Object value)throws NoSuchFieldException, SecurityException,IllegalArgumentException, IllegalAccessException {// 根据对象获取字节码文件对象Class c = obj.getClass();// 获取该对象的propertyName成员变量Field field = c.getDeclaredField(propertyName);// 取消访问检查field.setAccessible(true);// 给对象的成员变量赋值为指定的值field.set(obj, value);}}

package cn.itcast.test;public class ToolDemo {public static void main(String[] args) throws NoSuchFieldException,SecurityException, IllegalArgumentException, IllegalAccessException {Person p = new Person();Tool t = new Tool();t.setProperty(p, "name", "林青霞");t.setProperty(p, "age", 27);System.out.println(p);System.out.println("-----------");Dog d = new Dog();t.setProperty(d, "sex", '雄');t.setProperty(d, "price", 12.34f);System.out.println(d);}}class Dog {char sex;float price;@Overridepublic String toString() {return sex + "---" + price;}}class Person {private String name;public int age;@Overridepublic String toString() {return name + "---" + age;}}