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   Finding Constructors of a class using Reflection:

              Every java class should contain atleast one constructor if we do not add constructor

    in java class then java compiler adds public default constructor into a java class.

        To get constructors META DATA, we need to call getConstructors it  returns an array of  

   type constructor.

    Syntax:

      Constructor cons[]=c.getConstructors();

         Constructor is a class given in java .lang.reflect package. Finding constructor details means in java.lang.reflect package.

       Finding constructor details means finding constructor name and it’s parameter types. To print details of constructors of a class we need an inner loop here an outer loop is used for getting constructor name and inner loop is used for getting parameter types.

     For Example:

    //ReflectDemo4.java

        Class ReflectDemo4

      {
         Class c=Class.forName(args[0]);

        Constructor cons[]=c.getConstructor();

        System.out.println(“Constructors  and parameter types:”);

        for(int i=0;i<cons.length;i++)

       {
          String s1=cons[i].getName();   // finding constructor name

          System.out.println(s1+”(“);

          Class p[]=cons[i].getParameterTypes(); // finding the parameter type of constructor

          for(int j=0;j<p.length;i++)

         {

            String s2=p[j].getName();

           System.out.println(s1+””);

         }

           System.out.println(“)”);

        }

     }

       Analysis:

        From the above program we can understand that finding the constructor name and its 

       parameter types.

      Output:

     

             C:\> javac ReflectDemo4.java java.io.BufferedInputStream

            C:\> java ReflectDemo4

           Constructors and parameter types:

            0-public java.io.BufferedInputStream(java.io.InputStream,int)

            1-public java.io.BufferedInputStream(java.io.InputStream)

           Java.io.InputStream,int

             

•   Reflection concepts and what is Reflection?
•    Loading A Class or Interface in JVM
•    Finding  Super Class of A Class
•    Finding Fields of Class
•    Finding interfaces implemented by a class
•    Finding Methods
•   Finding Modifiers of Class