Is there any way to take a method using reflection without specifying its parameters?
I tried this:
method = className.class.getMethod("nameOfTheMethod");
Where nameOfTheMethod is a function with 5 parameters.
But it thinks that nameOfTheMethod is a function without parameters, and gives me java.lang.NoSuchMethodException.
You can get all methods
declared by the class or interface represented by this Class object.
with
Method[] methods = ClassName.class.getDeclaredMethods();
Iterate through them and find yours. This isn't safe if your method is overloaded as you will still have to check the parameters.
You can't do it like that, the getMethod needs the number of parameters.
What you could use is getMethods or getDeclaredMethods, depending what you're looking for, and match any of them with the name you want.
You could get more than 1 of them matching the name but with different parameters.
getMethods will
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
while getDeclaredMethods will
Returns an array of Method objects reflecting all the methods declared by the class or interface represented by this Class object. This includes public, protected, default (package) access, and private methods, but excludes inherited methods.
You can achieve this by using getDeclaredMethods() and iterating the returned array.
Method[] methods = className.class.getDeclaredMethods();
for (Method m : methods) {
if (m.getName().equals("nameOfTheMethod")) {
// found
break;
}
}
This way has the downside, that it only works reliable for not overloaded methods. However, you can easily take this further, so an array or set of all methods with the specified name is found.
You need to specify the Parameter types
Try
Class[] cArg = new Class[5];
cArg[0] = Long.class;
cArg[1] = Long.class;
cArg[2] = Long.class;
cArg[3] = Long.class;
cArg[4] = Long.class;
Method lMethod = c.getMethod("nameOfMethod", cArg);
Replace the longs with whatever type your parameters are of respectively.
getMethod(...)as well.