Constructor Parameters Via Java Reflection

Question

I am using Reflection in Java. Can I please have some help to get the constructor parameter names and values?

Here is my code:

  public String getConstructors(Class aClass)
  {
  StringBuilder ClassConstructors = new StringBuilder();
  Constructor[] Constructors = aClass.getConstructors();
  String separator = System.getProperty( "line.separator" );
  for (Constructor c: Constructors)
  {
      boolean isPublic = Modifier.isPublic(c.getModifiers());
      Class[] parameterTypes = c.getParameterTypes();
      for (Class pt : parameterTypes)
      {
          System.out.println(pt.getName());
          //Field[] Fields = pt.getDeclaredFields();
          //for (Field f : Fields) 
          //{
              //System.out.println(f.getType());
          //}
      }
  }
  return ClassConstructors.toString();

}

The constructor that I am testing has the following parameters:

String Name, int Diameter

The System.out.println(pt.getName()); line of code is currently printing out the following:

java.lang.String
int

Is it possible to get the Type and Name of each of the parameters?

Java bytecode doesn't contain names of args

anstarovoyt
– anstarovoyt

2013-03-25 07:52:29 +00:00
Commented Mar 25, 2013 at 7:52 — anstarovoyt
– anstarovoyt, Commented Mar 25, 2013 at 7:52

NPE · Accepted Answer · 2013-03-25 07:51:18Z

7

You already have the types, and there's no way to get the names (since they're not preserved as part of the bytecodes).

answered Mar 25, 2013 at 7:51

NPE

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2 Comments

user2023359 Over a year ago

Is this the same for methods? Method names cannot be retrieved?

NPE Over a year ago

@user2023359: Method names -- yes. Argument names -- no.

guruprasath · Accepted Answer · 2013-03-25 07:50:50Z

1

Name is not available via reflection in JAVA.

answered Mar 25, 2013 at 7:50

guruprasath

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