http://blog.csdn.net/kjfcpua/article/details/8496911
java代码中,常常将一个类的成员变量置为private
在类的外面获取此类的私有成员变量的value时,需要注意:
测试类:
public class AccessibleTest { private int id;
private String name; public AccessibleTest() { } public int getId() {
return id;
} public void setId(int id) {
this.id = id;
} public String getName() {
return name;
} public void setName(String name) {
this.name = name;
} }
Main类:
public class Main { public static void main(String[] args) throws Exception {
Class clazz = Class.forName("com.test.accessible.AccessibleTest");
AccessibleTest at = new AccessibleTest();
at.setId(1);
at.setName("AT");
for (Field f : clazz.getDeclaredFields()) {
f.setAccessible(true);//AccessibleTest类中的成员变量为private,故必须进行此操作
System.out.println(f.get(at));//获取当前对象中当前Field的value
} } }
如果没有在获取Field之前调用setAccessible(true)方法,异常:
(当然在AccessibleTest类的内部(AccessibleTest的内部类除外),进行如上操作则不需要调用setAccesible()方法)
- java.lang.IllegalAccessException:
- Class com.test.accessible.Main
- can not access
- a member of class com.test.accessible.AccessibleTest
- with modifiers "private"