2 chongshi007 chongshi007 于 2013.10.03 11:46 提问

在JAVA反射中间遇到的超奇怪的问题!

public static void main(String[] args) {
UserBean userBean=new UserBean();
Method[] methods=userBean.getClass().getMethods();
String name=methods[2].getName();
System.out.println(name);
}

}
输出的是getUid(),没有错
Klaus。(741691740) 11:23:20
但是:
public static void main(String[] args) {
UserBean userBean=new UserBean();
Method[] methods=userBean.getClass().getMethods();
String name=methods[2].getName();
System.out.println(name);
System.out.println(name.equals("getUid"));
System.out.println(name);
}

}
我多加了一句话。怎么就变成了输出getVaules了?

1个回答

solomon5926
solomon5926   2013.10.04 14:11
已采纳

你看帮助文档就能找到答案了,下面我贴一段Class类中getMethod()方法的描述,里面说得非常清楚,获得的Class数组是没有排序的。
public Method[] getMethods() throws SecurityException
Returns an array containing Method objects reflecting all the public member methods of the class or interface represented by this Class object, including those declared by the class or interface and those inherited from superclasses and superinterfaces. Array classes return all the (public) member methods inherited from the Object class. The elements in the array returned are not sorted and are not in any particular order. This method returns an array of length 0 if this Class object represents a class or interface that has no public member methods, or if this Class object represents a primitive type or void.

看这句话
The elements in the array returned are not sorted and are not in any particular order.
当你修改代码之后就,Method[]中的元素的顺序就会被打乱。

不知道我给的答案是不是完全正确,期待更好的解释。

chongshi007
chongshi007 嗯,,谢谢~我觉得也是这样的哈
4 年多之前 回复
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