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java programming

Posted on 2004-10-01
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Last Modified: 2010-03-31
Class cc=Class.forName(className);
Field[] ff=cc.getDeclaredFields();

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

                    Class type =ff[i].getType();
                    
                    if(type.isPrimitive()==false)
                    {
                      Class treeset =Class.forName(ff[i]);
                            }
 }
}
Iam getting error from the above code,how to retrieve non-primitive field ,class and store in a class treeset?
0
Comment
Question by:sraveend
  • 6
  • 6
  • 2
  • +1
15 Comments
 
LVL 86

Expert Comment

by:CEHJ
ID: 12204400
You should be OK

            String className = "java.lang.String";
            Class cc = Class.forName(className);
            Field[] ff = cc.getDeclaredFields();

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

                  Class type = ff[i].getType();

                  if (type.isPrimitive() == false) {
                        //Class treeset = Class.forName(ff[i]);
                        System.out.println("Found " + type);
                  }
            }

0
 
LVL 92

Expert Comment

by:objects
ID: 12204415
Class.forName() expects a String, and not a Field instance.
and you don't need to call Class.forName() as you alreay have the Class instance 'type'.
0
 
LVL 30

Accepted Solution

by:
Mayank S earned 400 total points
ID: 12206511
>> Class treeset =Class.forName(ff[i]);

I think you want to do:

TreeSet trList = new TreeSet () ;
Class cc = Class.forName ( className ) ;
Field[] ff = cc.getDeclaredFields () ;

for ( int i = 0 ; i < ff.length ; i ++)
{
  Class type = ff[i].getType () ;

  if ( type.isPrimitive () == false )
    trList.add ( ff[i] ) ; // end if

} // end for
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LVL 30

Expert Comment

by:Mayank S
ID: 12206514
You can then display them using:

Iterator itTreeItems = trList.iterator () ;

while ( itTreeItems.hasNext () )
{
  Field f = ( Field ) itTreeItems.next () ;
  System.out.println ( f.getName () ) ;

} // end while
0
 

Author Comment

by:sraveend
ID: 12206849
Is there any option to find a package from a field type?
0
 
LVL 86

Expert Comment

by:CEHJ
ID: 12206855
The class name of the field will give the package
0
 

Author Comment

by:sraveend
ID: 12206860
Can we declare a field as a package?
0
 
LVL 86

Expert Comment

by:CEHJ
ID: 12206884
Not sure what you mean by that
0
 

Author Comment

by:sraveend
ID: 12206904
U've given class name of the field gives the package name,i just want an example
0
 
LVL 86

Assisted Solution

by:CEHJ
CEHJ earned 100 total points
ID: 12206919
while ( itTreeItems.hasNext () )
{
  Field f = ( Field ) itTreeItems.next () ;
  System.out.println ( f.getName () ) ;
  String fqName = f.getDeclaringClass().toString();
  String packageName = fqName.substring(0, fqName.lastIndexOf("."));
  System.out.println (packageName) ;
} // end while
0
 

Author Comment

by:sraveend
ID: 12207000
Class cc=Class.forName(className);
Field[] ff=cc.getDeclaredFields();

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

                    Class type =ff[i].getType();


                    if(type.isPrimitive()==false)
                    {
                    String fqName = type.toString();
                    int x=fqName.length();
                      String cName = fqName.substring(fqName.lastIndexOf(".")+1,x);
                      System.out.println("class name="+cName);

Class tset=Class.forName(TreeSet);
Field[] f=tset.set(String,cName);

                      String packageName = fqName.substring(0, fqName.lastIndexOf("."));
                      System.out.println("packagename="+packageName);

                           }
 }

Iam getting correct result for cName&packageName
But how to store class name (cName) in a class TreeSet.
0
 
LVL 86

Expert Comment

by:CEHJ
ID: 12207044
someSet.add(cName);
0
 

Author Comment

by:sraveend
ID: 12207088
Class cc=Class.forName(className);
Field[] ff=cc.getDeclaredFields();
TreeSet trList = new TreeSet();
for(int i=0;i<ff.length;i++)
         {

                    Class type =ff[i].getType();


                    if(type.isPrimitive()==false)
                    {
                    String fqName = type.toString();
                    int x=fqName.length();
                      String cName = fqName.substring(fqName.lastIndexOf(".")+1,x);
                      System.out.println("class name="+cName);

//Class tset=trList.class;
trList.add(cName);

                      String packageName = fqName.substring(0, fqName.lastIndexOf("."));
                      System.out.println("packagename="+packageName);

                           }
 }
Iam getting error in add?
0
 

Author Comment

by:sraveend
ID: 12208738
AM sorry, i've corrected my error.....
0
 
LVL 86

Expert Comment

by:CEHJ
ID: 12208852
8-)
0

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