Java 里面有没有类似于 js 的 Function.length 方法，返回参数个数

[qwertyegg]

js 参考

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/length

java 有对应的吗?

[bumz]

Reflection

[jaylee4869]

同楼上，反射.
```
public static void main(String[] args) throws ClassNotFoundException {
Class clazz = Class.forName("com.reflection.People");
Method[] methods = clazz.getDeclaredMethods();
for (Method method : methods) {
System.out.println(method.getName());
Parameter[] parameters = method.getParameters();
for (Parameter parameter : parameters) {
System.out.println(parameter.getName());
}
}
}
```

[qwertyegg]

多谢 @bumz @jaylee4869