我面临着这个问题，我正在尝试从一个类中循环所有我的方法到另一个类中，我已经做到了，但是我有两个循环，一个从结尾到开头执行，然后另一个没有执行。这个错误显示给我
`Exception in thread "main" java.lang.IllegalArgumentException: wrong number of arguments`
这是我尝试获取我的方法结果的地方
public class finalResult {
    public static void main(String[] args) throws InvocationTargetException, IllegalAccessException {
        loopUserDataClass();
        loopBankDataClass();
    }
    public static void loopUserDataClass() throws InvocationTargetException, IllegalAccessException {
        userData us = new userData();
        Class<?> getUserDataClass = us.getClass();
        Method[] methods1 = getUserDataClass.getMethods();
        for (Method method : methods1) {
            if (Modifier.isPublic(method.getModifiers())) {
                method.invoke(us, null);
            }
        }
    }
    public static void loopBankDataClass() throws InvocationTargetException, IllegalAccessException {
        bankData bd = new bankData();
        Class<?> getBankClass = bd.getClass();
        Method[] methods = getBankClass.getMethods();
        for (Method method : methods) {
            if (Modifier.isPublic(method.getModifiers())) {
                try {
                    method.invoke(bd, null);
                } catch (Exception ex) {
                    // 在这里处理异常
                    ex.printStackTrace();
                }
            }
        }
    }
}
这是我拥有我的方法的类。
public class bankData {
    public double moneyOnAccount = 123.50;
    public String currencyName = &quot;currencyName&quot;;
    public boolean accountState = true;
    public String accountId =&quot;2432432423ffsdf&quot;;
    public void getMoneyOnAccount() {
        System.out.println(&quot;Money on account: &quot; + this.moneyOnAccount);
    }
    public void getCurrencyName()
    {
        System.out.println(&quot;Currency: &quot; + this.currencyName);
    }
    public void getAccountState()
    {
        System.out.println(&quot;Account statement: &quot; + this.accountState);
    }
    public void getAccountId()
    {
        System.out.println(&quot;Account ID: &quot; + this.accountId);
    }
}
我相信我在这一行中有问题
```java
method.invoke(bd, null);

<details>
<summary>英文:</summary>
I am facing this problem, I am trying to loop all my methods from one class to another and I did do that, but I have 2 loops where one gets executed from the end to the beginning and then the other one does not get executed. This error shows to me 
`Exception in thread &quot;main&quot; java.lang.IllegalArgumentException: wrong number of arguments`
This is where I am trying to get the result of my methods

public static void loopUserDataClass() throws InvocationTargetException, IllegalAccessException {
userData us = new userData();
Class<?> getUserDataClass = us.getClass();
Method[] methods1 = getUserDataClass.getMethods();
for (Method method : methods1) {
if (Modifier.isPublic(method.getModifiers())) {
method.invoke(us, null);
}
}
}
public static void loopBankDataClass() throws InvocationTargetException, IllegalAccessException {
bankData bd = new bankData();
Class<?> getBankClass = bd.getClass();
Method[] methods = getBankClass.getMethods();
for (Method method : methods) {
if (Modifier.isPublic(method.getModifiers())) {
try {
method.invoke(bd, null);
} catch (Exception ex) {
// Handle the exception here
ex.printStackTrace();
}
}
}
}
}

And here is the class where I have my methods. 

I believe that I have a problem with this line 

I tried to put it in too many different ways but always shows me the same error. I do not have any arguments to pass so I do not know what I have to pass there. 
</details>
# 答案1
**得分**: 0
翻译结果如下：
所以，如果我稍微修改你的代码来执行...
try {
method.invoke(bd, null);
} catch (Exception ex) {
// 在这里处理异常
//ex.printStackTrace();
System.out.println("&gt;&gt;" + method.getName());
}
我们可以了解哪些方法导致了问题。在我的测试中，这会打印
&gt;&gt; wait
&gt;&gt; wait
&gt;&gt; wait
&gt;&gt; equals
&gt;&gt; notify
&gt;&gt; notifyAll
好的，这其实很有道理，所有这些方法都会期望一个或多个参数。
那么，我们该如何修复呢？嗯，不要使用 `Method[] methods = getBankClass.getMethods();`，你应该使用 `Method[] methods = getBankClass.getDeclaredMethods();`。
这两者之间的区别可以在[Java文档](https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Class.html)中找到：
`Class#getMethods`：
&gt; 返回一个包含反映由此 Class 对象表示的类或接口的所有公共方法的 Method 对象数组，包括由该类或接口声明的方法以及从超类和超接口继承的方法。
`Class#getDeclaredMethods`
&gt; 返回一个包含反映由此 Class 对象表示的类或接口的所有已声明方法的 Method 对象数组，包括公共方法、受保护方法、默认（包）访问方法和私有方法，但不包括继承的方法。
<details>
<summary>英文:</summary>
So, if I modify your code slightly to do...
try {
method.invoke(bd, null);
} catch (Exception ex) {
// Handle the exception here
//ex.printStackTrace();
System.out.println(&quot; &gt;&gt; &quot; + method.getName());
}
We can get an idea of which methods are causing your issues.  In my testing this prints
&gt;&gt; wait
&gt;&gt; wait
&gt;&gt; wait
&gt;&gt; equals
&gt;&gt; notify
&gt;&gt; notifyAll
Okay, that actually makes sense, all of those methods will expect one or more parameters.
So, how do we fix it?  Well, instead of using `Method[] methods = getBankClass.getMethods();` you should probably be using `Method[] methods = getBankClass. getDeclaredMethods();`
The difference between the two can be found in the [JavaDocs](https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Class.html)
`Class#getMethods`:
&gt; Returns an array containing `Method` objects reflecting all the public 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.**
`Class#getDeclaredMethods`
&gt; Returns an array containing `Method` objects reflecting all the declared methods of the class or interface represented by this Class object, including public, protected, default (package) access, and private methods, **but excluding inherited methods.**
</details>