java反射機制——獲取位元組碼對應類中的欄位
阿新 • • 發佈:2018-11-09
package cn.itcast.reflect.demo; import java.lang.reflect.Field; public class ReflectDemo3 { public static void main(String[] args) throws ClassNotFoundException, NoSuchFieldException, SecurityException, InstantiationException, IllegalAccessException { //欄位的訪問 getfieldDemo(); } public static void getfieldDemo() throws ClassNotFoundException, NoSuchFieldException, SecurityException, InstantiationException, IllegalAccessException { String classname="cn.itcast.bean.demo.Person"; Class c=Class.forName(classname); Field field=c.getDeclaredField("age");//能獲取包含私有的欄位 field.setAccessible(true);//對私有欄位的訪問取消許可權檢查,暴力訪問 Object obj=c.newInstance(); field.set(obj, 50); Object o=field.get(obj); System.out.println(o); } }