public   final   class  z
{

     public  z(String s,  char  ac[],  boolean  flag)
    {
        a_java_lang_String_fld = s;
        a_char_array1d_fld = ( char [])( char [])ac.clone();
        a_boolean_fld = flag;
    }

     public  String a()
    {
         return  a_java_lang_String_fld;
    }

     public   char [] a()
    {
         return  a_char_array1d_fld;
    }

     public   boolean  a()
    {
         return  a_boolean_fld;
    }

     private  String a_java_lang_String_fld;
     private   char  a_char_array1d_fld[];
     private   boolean  a_boolean_fld;
}

Method ma=null;
for(Method m:A.class.getDeclaredMethods()){
   if("a".equals(m.getName()) && Enumeration.class==m.getReturnType()){
      ma=m;
      break;
   }
}
Enumeration enum=ma.invoke([instance of A], null); 

public class GetFieldValueByClass {

    Object obj1;
    int int1;
    int int2;
    boolean boolean1;

    public GetFieldValueByClass(Object arg1, int arg2, int arg3, boolean arg4){
        this.obj1 = arg1;
        this.int1 = arg2;
        this.int2 = arg3;
        this.boolean1 = arg4;
    }
    
    public Object getFieldValueByClass(java.lang.Class c) throws java.lang.IllegalAccessException {
        for (java.lang.reflect.Field f : c.getDeclaredFields()) {
            Object obj = f.get(this); 
            if (obj.getClass() == f.getType()) {
                return obj;
            }
        };
        return null;
    }
}

    public Object getFieldValueByClass(java.lang.Class c) throws java.lang.IllegalAccessException {
        for (java.lang.reflect.Field f : this.getClass().getDeclaredFields()) {
            Object obj = f.get(this);
            if (obj instanceof java.util.Vector) {
                return obj;
            }
        };
        return null;
    }