Get the method output parameters parameters

Question

I using the following code to get the method input parameter but I getting the wrong params for example I for set salary I want to get the type (double )and the name (salary) . what i miss here ?

public void setSalery(double salery) {
    this.salery = salery;
  }

this is the code

for (Method method : classHandle.getMethods()) {


            Class<?>[] parameterTypes = method.getParameterTypes();

            for (Class<?> class1 : parameterTypes) {

                Field[] declaredFields = class1.getDeclaredFields();
                for (Field field : declaredFields) {
                    System.out.println(field.getName());


            }

You're currently printing out the fields of the parameter types. I can't immediately find any method which will give you the parameter names... — Jon Skeet
– Jon Skeet, Commented Jan 17, 2013 at 7:28
Well, what you are asking for, I faced this few months ago. But I couldn't find any way to get the names of the parameters. Probably because they are not stored as a part of the compiled class file. I thought there might be some way, like annotating the class in some way to tell it to store the names, but I couldn't find one. — Rohit Jain
– Rohit Jain, Commented Jan 17, 2013 at 7:31

Jim Garrison · Accepted Answer · 2013-01-17 08:31:22Z

3

You can retrieve the parameter types but not the parameter names. They are of no significance except within the method, which at this point is opaque to you. getDeclaredFields() returns the fields in the types, not the parameter names.

To invoke such a method (using your example), assume

MyBean b = new MyBean(); // contains method setSalary(double salary)
Method m = ...           // a reference to a Method object for MyBean#setSalary(double salary)
double newSalary = ...;

Then do

m.invoke(b, new Double(newSalary));

edited Jan 17, 2013 at 8:31

answered Jan 17, 2013 at 7:29

Jim Garrison

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3 Comments

Stefan Strooves Over a year ago

Actually I want at the end to find all the Set methods and to send them parameter ,there is no way to do it ? my secnario is to get method name by string and to find all the sets method and than to send them the respective data..

Jim Garrison Over a year ago

For that you do not need the parameter name, only its type. When you invoke the method (using Method#invoke(Object, Object...)) parameters are matched by position, not by name.

Stefan Strooves Over a year ago

Can you provide some example please?

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