Not related to Exam

[Sarath Koiloth Ramath]

Hi i try to print all the methods in a class which extends another class.But i can print all the methods excluding the super class.I am getting the Object class methods but not the methods in the super class.

 
import java.lang.reflect.*;
 
class R {
 
  private void printS1(){System.out.print("R.printS1 ");}
  protected void printS2() {System.out.print("R.printS2 ");}
  protected void printS1S2(){
  printS1();printS2();
 }
}
class S extends R {
  private void printS1(){System.out.print("S.printS1 ");}
  protected void printS2(){System.out.print("S.printS2 ");}
  public static void main(String[] args) {
S s =new S();
    Method[] mm=s.getClass().getMethods();
    for(Method m:mm){
    System.out.println(m);
    }
  }
}

[Jesper de Jong]

If this is a question that's not related to the SCJP exam, then why are you posting it in the SCJP forum?

I'm moving it to the Java in General (Beginner) forum for you. Please carefully choose a forum and use a meaningful subject line when you ask a question.

[Arsineh Keshishian]

Sarath,

with Method[] mm=s.getClass().getMethods();
you only get the methods in Class S and R which have the access modifier public, not protected and not private.
Since getMethods() is a method in Class Class, in package java.lang, it won't find the private and protected mehtods neither in Class S nor in Class R.
So you have to modify the methods you want to be found in both classes R and S to coderanch.

Bye
Arsineh
[ June 04, 2008: Message edited by: Arsineh Keshishian ]

[Campbell Ritchie]

Jesper, you're not calling reflection a beginner's topic, surely? I'll resist the temptation to move it again, however.

[Peter Chase]

getDeclaredMethods() is what you want.

[Sarath Koiloth Ramath]

Thanks for all the reply

Is there any method to print down the printS1S2(): ie the inherited method.
And please tell how to show the private and protected methods in a class.

[Rob Spoor]

Originally posted by Peter Chase:
getDeclaredMethods() is what you want.

For the methods in this class. Use getSuperclass() to get a reference to the super class.

In a recursive way:

public void printMethods(Class<?> c)
{
    if (c != null)
    {
        for (Method m: c.getDeclaredMethods())
        {
            System.out.println(m);
        }
        printMethods(c.getSuperclass());
    }
}