反射获取成员变量并使用

public class ReflectDemo01 {
    public static void main(String[] args) throws ClassNotFoundException {
        //获取Class对象
        Class<?> c = Class.forName("com.reflect_02.Student");

        //Field[] getFields()
        //返回包含一个数组 Field对象反射由此表示的类或接口的所有可访问的公共字段类对象。
        Field[] fields = c.getFields();
        for (Field field : fields){
            System.out.println(field);
        }
    }
}

public class ReflectDemo01 {
    public static void main(String[] args) throws ClassNotFoundException {
        //获取Class对象
        Class<?> c = Class.forName("com.reflect_02.Student");

        //Field[] getDeclaredFields()
        //返回的数组Field对象反映此表示的类或接口声明的所有字段类对象。
        Field[] fields = c.getDeclaredFields();
        for (Field field : fields){
            System.out.println(field);
        }
    }
}

public class ReflectDemo01 {
    public static void main(String[] args) throws ClassNotFoundException, NoSuchFieldException, NoSuchMethodException, IllegalAccessException, InvocationTargetException, InstantiationException {
        //获取Class对象
        Class<?> c = Class.forName("com.reflect_02.Student");

        //Field getField(String name)
        //返回一个Field对象，它反映此表示的类或接口的指定公共成员字段 类对象。
        Constructor<?> con = c.getConstructor();
        Object obj = con.newInstance();

        Field addressField = c.getField("address");
        addressField.set(obj,"西安"); //给obj的成员变量address赋值为 西安
        System.out.println(obj);
    }
}

 1 public class ReflectDemo01 {
 2     public static void main(String[] args) throws ClassNotFoundException, NoSuchFieldException, NoSuchMethodException, IllegalAccessException, InvocationTargetException, InstantiationException {
 3         //获取Class对象
 4         Class<?> c = Class.forName("com.reflect_02.Student");
 5 
 6         Constructor<?> con = c.getConstructor();
 7         Object obj = con.newInstance();
 8 
 9         //Field getDeclaredField(String name)
10         //返回一个 Field对象，它反映此表示的类或接口的指定已声明字段 类对象。
11         Field nameFiled = c.getDeclaredField("name");
12         nameFiled.setAccessible(true);
13         nameFiled.set(obj,"林青霞");
14         System.out.println(obj);
15     }
16 }