Help with public static final List
I'm having a block here... I want to have a constant List, but I can't figure out how to do it so it actually contains the values I want. It's going to be a list of strings about 40 elements long. Obviously, if I didn't need the final, I'd just do List.add( ), but I need to do it right in the constructor. Thanks for the help.
I guess the problem could be reworded, If I wantedto
put this in a class that would never getinstantiated
how would I initialize the List?You use a static intializer.Ah. I didn't get that out of the question. Thanks for the help.
But here's an example:public class Foo {
static final java.util.List<String> list = new java.util.ArrayList<String>();
list.add("one");
list.add("two");
list.add("three");
// etc.
}
Similar Messages
-
Trying to acces the value of a public static final int using reflection
-Java 6
-Windows XP
-Signed Applet
doing the following:
Class.forName(classname).getField(code).getInt(null);
is giving me the error:
java.lang.IllegalAccessException: Class com.cc.applet.util.ServiceConfiguration can not access a member of class com.cc.util.error.codes.SendMessageErrorCodes with modifiers "public static final"
at sun.reflect.Reflection.ensureMemberAccess(Unknown Source)
at java.lang.reflect.Field.doSecurityCheck(Unknown Source)
at java.lang.reflect.Field.getFieldAccessor(Unknown Source)
at java.lang.reflect.Field.getInt(Unknown Source)
I'm not understanding why it can't access the value of the field. Any help would be great.
Edited by: zparticle on Oct 17, 2007 11:07 PMstefan.schulz wrote:
oebert, you are right. Good one.
I actually think that, in this case, the message is misleading. The current implementation of sun.reflect.Reflection.ensureMemberAccess() treats any failing access check the same. It should and could inculde better contextual information.Stefan,
That is a good point. Did you file a RFE with Sun yet? I also think they should provide a more contextual error message in this case.
Gili -
Public static final Comparator String CASE_INSENSITIVE_ORDER
in this declaration..
public static final Comparator<String> CASE_INSENSITIVE_ORDER
what does <String> mean?
thanks!what does the Comparator do. Look at the API and you would see the following description about the compare method.
public int compare(Object o1,
Object o2)Compares its two arguments for order. Returns a negative integer, zero, or a positive integer as the first argument is less than, equal to, or greater than the second.
The implementor must ensure that sgn(compare(x, y)) == -sgn(compare(y, x)) for all x and y. (This implies that compare(x, y) must throw an exception if and only if compare(y, x) throws an exception.)
The implementor must also ensure that the relation is transitive: ((compare(x, y)>0) && (compare(y, z)>0)) implies compare(x, z)>0.
Finally, the implementer must ensure that compare(x, y)==0 implies that sgn(compare(x, z))==sgn(compare(y, z)) for all z.
It is generally the case, but not strictly required that (compare(x, y)==0) == (x.equals(y)). Generally speaking, any comparator that violates this condition should clearly indicate this fact. The recommended language is "Note: this comparator imposes orderings that are inconsistent with equals."
Now your question is about what <String> is in your declaration. It is the type of the objects which are going to be compared. -
Constant values (public static final String) are not shown??
This has already been posted and no body answered. Any help is appreciated.
In web service is it possible to expose the Constants used in the application. Let say for my web service I need to pass value for Operation, possible values for this are (add, delete, update). Is it possible expose these constant values(add, delete, update) visible to client application accesssing the web service.
Server Side:
public static final String ADD = "ADDOPP";
public static final String DELETE = "DELETEOPP";
public static final String UPDATE = "UPDATEOPP";
client Side: mywebserviceport.setOperation( mywebservicePort.ADD );
thanks
vijaySure, you can use JAX-WS and enums.
For example on the server:
@WebService
public class echo {
public enum Status {RED, YELLOW, GREEN}
@WebMethod
public Status echoStatus(Status status) {
return status;
on the client you get.
@WebService(name = "Echo", wsdlLocation ="..." )
public interface Echo {
@WebMethod
public Status echoStatus(
@WebParam(name = "arg0", targetNamespace = "")
Status arg0);
@XmlEnum
public enum Status {
GREEN,
RED,
YELLOW;
public String value() {
return name();
public static Status fromValue(String v) {
return valueOf(v);
} -
Proper setup for a network with Public Static IPs and Private IPs
hello all-
i am trying to setup a network with public static IP addresses and local (internal) IP addresses with 192.168.xxx.xxx format. i will try to explain as best i can how i have it set up and what my issues are.
i have COX business services in my home and 8 static public IPs assigned to me. i have tried setting this up and everything internally (192.168.xxx.xxx) works fine and all the devices can get to the outside world fine but when i try to access ANY of the devices on the public IPs from outside the network i get absolutely nothing. the browser just times out and i cannot ping the devices even though COX can see and says the devices are bridging over. COX is unable to get a response when they ping the devices either.
one of the devices is a Synology NAS with one Ethernet port that is using a public IP and the other using a 192.168.xxx.xxx address. when the Ethernet port is setup using a static public IP COX can see it but they get no response from a ping and when they go to the address to get the login page the browser times out. when i reconfigure the port for DHCP it grabs a public DHCP address and when COX pings that they get a response AND they are able to type the DHCP adress in their browser and get to the login page no problem. when i switch back to the static IP they can see it but again are unable to get a response from a ping and are unable to go to the login page.
my setup is:
COX Modem (only has 1 Ethernet port) ====>> 8 port NETGEAR Gigabit switch (all devices with Public IPs are plugged into the NETGEAR switch)
NETGEAR switch ====>> WAN Port on Airport Extreme (latest version w/all software updates)
LAN Port Airport Extreme ====>> CISCO 2960 48 port Gigabit Switch (all internal devices are plugged into the CISCO switch)
like i said everything with the 192.168.xxx.xxx connects and i can connect to just fine but none of the devices with public static IPs can be pinged even though COX can see them bridging over. i have tried all new cables on the devices and that didn't work so it has to be something with my setup.
do i need to add another router to this configuration because i have extra airport extremes lying around i can use if someone could just tell me how the setup should be. i also have a few ports open on the CISCO switch; is there a way i can use it for the 4-5 devices that have public IPs? or will that cause a problem with all the other devices plugged into it with the 192.168.xxx.xxx IP addresses?
i'm not a networking guru (obviously) so if you are able to help me get this setup properly can you try not to use Doctoral Level syntax in your response? i would greatly appreciate it!
i appreciate any and all help... thx in advance!Duplicate posts.
Go HERE. -
Declaring public static final variables in jsp?
The question is in the title...
I know this is not a jsp forum, but some people here might know if it's possible or not.
If yes, how to declare them and how to access them from other jsp pages?
ThxIf you need that, you definitely do too much work in your JSPs. You should do all your work in Servlets (or Actions if you're using Struts or something similar).
Your JSPs should only do the presentation.
Remember that JSPs are not classes (they are compiled into classes internally, but you don't have direct access to those).
If you absolutely need such a public static final field that you want to access from several JSPs, just define it in a Class and reference that class from your JSPs. -
Need help with ouput of a list or array of numbers input from user
I'm only a few weeks into learning java, so this may seem simple to some, but...
I am trying to write a program that will receive numbers from a user,
and then list, add, average those numbers. I've got the program to
work except for listing the numbers that were input.
Can someone help guide me????
i've left the code I've tried in as comments.
Enter an integer value, the program exits if the input is 0:
20
Enter an integer value, the program exits if the input is 0:
40
Enter an integer value, the program exits if the input is 0:
60
Enter an integer value, the program exits if the input is 0:
80
Enter an integer value, the program exits if the input is 0:
0
Total numbers entered: 4
The array of numbers is: 0 0 0 0
The sum is 200
The average is 50
The maximum number is 0
The minimum is 0
Here is my code:
* Title: Reads integers and finds the total, average, maximum of the input values
* Description:
* Copyright: Copyright (c) 2002
* Company: Duke Court.
* @author Mary Davenport
* @version 1.0
public class part3page6
public static void main(String[] args)
int data = 0;
int sum = 0;
int countnum = -1;
int maximum = 0;
int minimum = 0;
int average = (countnum - 1);
do
System.out.println("Enter an integer value, " +
" the program exits if the input is 0: ");
data = MyInput.readInt();
sum += data;
countnum++;
} while (data != 0);
//in order to figure the max & the min it appears that the
//program will need to utilize arrays to store the individual numbers
//that are input from the user.
//create an array of the input data
int[] number = new int[countnum];
//creat a list of the input data
int []myList = {data};
//lists how many numbers entered
System.out.println("Total numbers entered: " + number.length);
//list array of numbers -- this is giving me [I@3179c3,
//instead of 20, 40, 60, 80 when I use "new int[countnum]"
// System.out.print("The array of numbers is: "
// + new int[countnum]);
//list array of numbers: this is giving me " 0 0 0 0 "
//instead of 20, 40, 60, 80 with the following for statement
// (number[i] + " ")
System.out.print("The array of numbers is: ");
for(int i=0; i<number.length; i++)
System.out.print(number[i] + " ");
//list mylist of numbers from input, 20, 40, 60, 80
//output is The list of numbers is: [I@3179c3
// System.out.print("The list of numbers is: " + myList);
System.out.println();
System.out.println("The sum is " + sum);
average = sum/countnum;
System.out.println("The average is " + average);
System.out.println("The maximum number is " + maximum);
System.out.println("The minimum is " + minimum);When you input the data you need to save it to the array. Currently you are not saving the value you are just adding it
ArrayList nums = new ArrayList();
do
System.out.println("Enter an integer value, " +
" the program exits if the input is 0: ");
data = MyInput.readInt();
nums.add(new Integer(data));
sum += data;
countnum++;
} while (data != 0); -
Can someone help with splitting a Linked List.??
Any help would be awesome!!!
My code just will not work!! Any help would be appreciated! My problem is in the last method SplitAt. These are the conditions set and my code:
Splitting a Linked List at a Given Node, into Two Sublists
a. Add the following as an abstract method to the class
LinkedListClass:
public void splitAt (LinkedListClass<T> secondList, T item);
//This method splits the list at the node with the info item into two sublists.
//Precondition: The list must exist.
//Postcondition: first and last point to the first and last nodes of the first sublist,
// respectively. secondList.first and secondList.last point to the first
// and last nodes of the second sublist.
Consider the following statements:
UnorderedLinkedList<Integer> myList;
UnorderedLinkedList<Integer> otherList;
Suppose myList points to the list with the elements 34, 65, 18, 39, 27, 89, and 12 (in this order). The statement
myList.splitAt(otherList, 18);
splits myList into two sublists: myList points to the list with elements 34 and 65, and otherList points to the sublist with elements 18, 39, 27, 89, and 12.
b. Provide the definition of the method splitAt in the class UnorderedLinkedList. Also write a program to test your method.
public class UnorderedLinkedList<T> extends LinkedListClass<T>
//Default constructor
public UnorderedLinkedList()
super();
//Method to determine whether searchItem is in
//the list.
//Postcondition: Returns true if searchItem is found
// in the list; false otherwise.
public boolean search(T searchItem)
LinkedListNode<T> current; //variable to traverse
//the list
boolean found;
current = first; //set current to point to the first
//node in the list
found = false; //set found to false
while (current != null && !found) //search the list
if (current.info.equals(searchItem)) //item is found
found = true;
else
current = current.link; //make current point to
//the next node
return found;
//Method to insert newItem in the list.
//Postcondition: first points to the new list
// and newItem is inserted at the
// beginning of the list. Also,
// last points to the last node and
// count is incremented by 1.
public void insertFirst(T newItem)
LinkedListNode<T> newNode; //variable to create the
//new node
newNode =
new LinkedListNode<T>(newItem, first); //create and
//insert newNode before
//first
first = newNode; //make first point to the
//actual first node
if (last == null) //if the list was empty, newNode is
//also the last node in the list
last = newNode;
count++; //increment count
//Method to insert newItem at the end of the list.
//Postcondition: first points to the new list and
// newItem is inserted at the end
// of the list. Also, last points to
// the last node and
// count is incremented by 1.
public void insertLast(T newItem)
LinkedListNode newNode; //variable to create the
//new node
newNode =
new LinkedListNode(newItem, null); //create newNode
if (first == null) //if the list is empty, newNode is
//both the first and last node
first = newNode;
last = newNode;
else //if the list is not empty, insert
//newNode after last
last.link = newNode; //insert newNode after last
last = newNode; //set last to point to the
//actual last node
count++;
}//end insertLast
//Method to delete deleteItem from the list.
//Postcondition: If found, the node containing
// deleteItem is deleted from the
// list. Also, first points to the first
// node, last points to the last
// node of the updated list, and count
// is decremented by 1.
public void deleteNode(T deleteItem)
LinkedListNode<T> current; //variable to traverse
//the list
LinkedListNode<T> trailCurrent; //variable just
//before current
boolean found;
if ( first == null) //Case 1; the list is empty
System.err.println("Cannot delete from an empty "
+ "list.");
else
if (first.info.equals(deleteItem)) //Case 2
first = first.link;
if (first == null) //the list had only one node
last = null;
count--;
else //search the list for the given info
found = false;
trailCurrent = first; //set trailCurrent to
//point to the first node
current = first.link; //set current to point to
//the second node
while (current != null && !found)
if (current.info.equals(deleteItem))
found = true;
else
trailCurrent = current;
current = current.link;
}//end while
if (found) //Case 3; if found, delete the node
count--;
trailCurrent.link = current.link;
if (last == current) //node to be deleted
//was the last node
last = trailCurrent; //update the value
//of last
else
System.out.println("Item to be deleted is "
+ "not in the list.");
}//end else
}//end else
}//end deleteNode
public void splitAt(LinkedListClass<T> secondList, T item)
LinkedListNode<T> current;
LinkedListNode<T> trailCurrent;
int i;
boolean found;
if (first==null)
System.out.println("Empty.");
first=null;
last=null;
count--;
else
current=first;
found=false;
i=1;
while(current !=null &&!found)
if(current.info.equals(secondList))
found= true;
else
trailCurrent=current;
i++;
if(found)
if(first==current)
first=first;
last=last;
count=count;
count=0;
else
first=current;
last=last;
last=null;
count = count- i+1;
count = i-1;
else
System.out.println("Item to be split at is "
+ "not in the list.");
first=null;
last=null;
count=0;
}Edited by: romeAbides on Oct 10, 2008 1:24 PMI dont have a test program at all. The program is supposed to prompt for user input of numbers. (it does) Take the input and end at input of -999 (it does). Then it asks user where it wants to split list (it does). When I enter a number it does nothing after that. I am going to post updated code and see if that helps along with all the classes. Thanks!
This is the class to prompt:
import java.util.*;
public class Ch16_ProgEx6
static Scanner console = new Scanner(System.in);
public static void main(String[] args)
UnorderedLinkedList<Integer> list
= new UnorderedLinkedList<Integer>();
UnorderedLinkedList<Integer> subList =
new UnorderedLinkedList<Integer>();
Integer num;
System.out.println("Enter integers ending with -999.");
num = console.nextInt();
while (num != -999)
list.insertLast(num);
num = console.nextInt();
System.out.println();
System.out.println("list: ");
list.print();
System.out.println();
System.out.println("Length of list: " + list.length());
System.out.print("Enter the number at which to split list: ");
num = console.nextInt();
list.splitAt(subList, num);
System.out.println("Lists after splitting list");
System.out.print("list: ");
list.print();
System.out.println();
System.out.println("Length of list: " + list.length());
System.out.print("sublist: ");
subList.print();
System.out.println();
System.out.println("Length of sublist: " + subList.length());
}This is the ADT:
public interface LinkedListADT<T> extends Cloneable
public Object clone();
//Returns a copy of objects data in store.
//This method clones only the references stored in
//each node of the list. The objects that the
//list nodes point to are not cloned.
public boolean isEmptyList();
//Method to determine whether the list is empty.
//Postcondition: Returns true if the list is empty;
// false otherwise.
public void initializeList();
//Method to initialize the list to an empty state.
//Postcondition: The list is initialized to an empty
// state.
public void print();
//Method to output the data contained in each node.
public int length();
//Method to return the number of nodes in the list.
//Postcondition: The number of nodes in the list is
// returned.
public T front();
//Method to return a reference of the object containing
//the data of the first node of the list.
//Precondition: The list must exist and must not be empty.
//Postcondition: The reference of the object that
// contains the info of the first node
// is returned.
public T back();
//Method to return a reference of object containing
//the data of the last node of the list.
//Precondition: The list must exist and must not be empty.
//Postcondition: The reference of the object that
// contains the info of the last node
// is returned.
public boolean search(T searchItem);
//Method to determine whether searchItem is in the list.
//Postcondition: Returns true if searchItem is found
// in the list; false otherwise.
public void insertFirst(T newItem);
//Method to insert newItem in the list.
//Postcondition: newItem is inserted at the
// beginning of the list.
public void insertLast(T newItem);
//Method to insert newItem at the end of the list.
//Postcondition: newItem is inserted at the end
// of the list.
public void deleteNode(T deleteItem);
//Method to delete deleteItem from the list.
//Postcondition: If found, the node containing
// deleteItem is deleted from the
// list.
public void splitAt(LinkedListClass<T> secondList, T item);
}This is the linked list class:
import java.util.NoSuchElementException;
public abstract class LinkedListClass<T> implements LinkedListADT<T>
protected class LinkedListNode<T> implements Cloneable
public T info;
public LinkedListNode<T> link;
//Default constructor
//Postcondition: info = null; link = null;
public LinkedListNode()
info = null;
link = null;
//Constructor with parameters
//This method sets info pointing to the object to
//which elem points to and link is set to point to
//the object to which ptr points to.
//Postcondition: info = elem; link = ptr;
public LinkedListNode(T elem, LinkedListNode<T> ptr)
info = elem;
link = ptr;
//Returns a copy of objects data in store.
//This method clones only the references stored in
//the node. The objects that the nodes point to
//are not cloned.
public Object clone()
LinkedListNode<T> copy = null;
try
copy = (LinkedListNode<T>) super.clone();
catch (CloneNotSupportedException e)
return null;
return copy;
//Method to return the info as a string.
//Postcondition: info as a String object is
// returned.
public String toString()
return info.toString();
} //end class LinkedListNode
public class LinkedListIterator<T>
protected LinkedListNode<T> current; //variable to
//point to the
//current node in
//list
protected LinkedListNode<T> previous; //variable to
//point to the
//node before the
//current node
//Default constructor
//Sets current to point to the first node in the
//list and sets previous to null.
//Postcondition: current = first; previous = null;
public LinkedListIterator()
current = (LinkedListNode<T>) first;
previous = null;
//Method to reset the iterator to the first node
//in the list.
//Postcondition: current = first; previous = null;
public void reset()
current = (LinkedListNode<T>) first;
previous = null;
//Method to return a reference of the info of the
//current node in the list and to advance iterator
//to the next node.
//Postcondition: previous = current;
// current = current.link;
// A refrence of the current node
// is returned.
public T next()
if (!hasNext())
throw new NoSuchElementException();
LinkedListNode<T> temp = current;
previous = current;
current = current.link;
return temp.info;
//Method to determine whether there is a next
//element in the list.
//Postcondition: Returns true if there is a next
// node in the list; otherwise
// returns false.
public boolean hasNext()
return (current != null);
//Method to remove the node currently pointed to
//by the iterator.
//Postcondition: If iterator is not null, then the
// node that the iterator points to
// is removed. Otherwise the method
// throws NoSuchElementException.
public void remove()
if (current == null)
throw new NoSuchElementException();
if (current == first)
first = first.link;
current = (LinkedListNode<T>) first;
previous = null;
if (first == null)
last = null;
else
previous.link = current.link;
if (current == last)
last = first;
while (last.link != null)
last = last.link;
current = current.link;
count--;
//Method to return the info as a string.
//Postcondition: info as a String object is returned.
public String toString()
return current.info.toString();
} //end class LinkedListIterator
//Instance variables of the class LinkedListClass
protected LinkedListNode<T> first; //variable to store the
//address of the first
//node of the list
protected LinkedListNode<T> last; //variable to store the
//address of the last
//node of the list
protected int count; //variable to store the number of
//nodes in the list
//Default constructor
//Initializes the list to an empty state.
//Postcondition: first = null, last = null,
// count = 0
public LinkedListClass()
first = null;
last = null;
count = 0;
//Method to determine whether the list is empty.
//Postcondition: Returns true if the list is empty;
// false otherwise.
public boolean isEmptyList()
return (first == null);
//Method to initialize the list to an empty state.
//Postcondition: first = null, last = null,
// count = 0
public void initializeList()
first = null;
last = null;
count = 0;
//Method to output the data contained in each node.
public void print()
LinkedListNode<T> current; //variable to traverse
//the list
current = first; //set current so that it points to
//the first node
while (current != null) //while more data to print
System.out.print(current.info + " ");
current = current.link;
}//end print
//Method to return the number of nodes in the list.
//Postcondition: The value of count is returned.
public int length()
return count;
//Method to return a reference of the object containing
//the data of the first node of the list.
//Precondition: The list must exist and must not be empty.
//Postcondition: The reference of the object that
// contains the info of the first node
// is returned.
public T front()
return first.info;
//Method to return a reference of object containing
//the data of the last node of the list.
//Precondition: The list must exist and must not be empty.
//Postcondition: The reference of the object that
// contains the info of the last node
// is returned.
public T back()
return last.info;
//Returns a copy of objects data in store.
//This method clones only the references stored in
//each node of the list. The objects that the
//list nodes point to are not cloned.
public Object clone()
LinkedListClass<T> copy = null;
try
copy = (LinkedListClass<T>) super.clone();
catch (CloneNotSupportedException e)
return null;
//If the list is not empty clone each node of
//the list.
if (first != null)
//Clone the first node
copy.first = (LinkedListNode<T>) first.clone();
copy.last = copy.first;
LinkedListNode<T> current;
if (first != null)
current = first.link;
else
current = null;
//Clone the remaining nodes of the list
while (current != null)
copy.last.link =
(LinkedListNode<T>) current.clone();
copy.last = copy.last.link;
current = current.link;
return copy;
//Method to return an iterator of the list.
//Postcondition: An iterator is instantiated and
// returned.
public LinkedListIterator<T> iterator()
return new LinkedListIterator<T>();
//Method to determine whether searchItem is in
//the list.
//Postcondition: Returns true if searchItem is found
// in the list; false otherwise.
public abstract boolean search(T searchItem);
//Method to insert newItem in the list.
//Postcondition: first points to the new list
// and newItem is inserted at the
// beginning of the list. Also,
// last points to the last node and
// count is incremented by 1.
public abstract void insertFirst(T newItem);
//Method to insert newItem at the end of the list.
//Postcondition: first points to the new list and
// newItem is inserted at the end
// of the list. Also, last points to
// the last node and
// count is incremented by 1.
public abstract void insertLast(T newItem);
//Method to delete deleteItem from the list.
//Postcondition: If found, the node containing
// deleteItem is deleted from the
// list. Also, first points to the first
// node, last points to the last
// node of the updated list, and count
// is decremented by 1.
public abstract void deleteNode(T deleteItem);
public abstract void splitAt(LinkedListClass<T> secondList, T item);
}And this is the UnorderedLinked Class with the very last method the one being Im stuck on. The SplitAt Method.
public class UnorderedLinkedList<T> extends LinkedListClass<T>
//Default constructor
public UnorderedLinkedList()
super();
//Method to determine whether searchItem is in
//the list.
//Postcondition: Returns true if searchItem is found
// in the list; false otherwise.
public boolean search(T searchItem)
LinkedListNode<T> current; //variable to traverse
//the list
boolean found;
current = first; //set current to point to the first
//node in the list
found = false; //set found to false
while (current != null && !found) //search the list
if (current.info.equals(searchItem)) //item is found
found = true;
else
current = current.link; //make current point to
//the next node
return found;
//Method to insert newItem in the list.
//Postcondition: first points to the new list
// and newItem is inserted at the
// beginning of the list. Also,
// last points to the last node and
// count is incremented by 1.
public void insertFirst(T newItem)
LinkedListNode<T> newNode; //variable to create the
//new node
newNode =
new LinkedListNode<T>(newItem, first); //create and
//insert newNode before
//first
first = newNode; //make first point to the
//actual first node
if (last == null) //if the list was empty, newNode is
//also the last node in the list
last = newNode;
count++; //increment count
//Method to insert newItem at the end of the list.
//Postcondition: first points to the new list and
// newItem is inserted at the end
// of the list. Also, last points to
// the last node and
// count is incremented by 1.
public void insertLast(T newItem)
LinkedListNode newNode; //variable to create the
//new node
newNode =
new LinkedListNode(newItem, null); //create newNode
if (first == null) //if the list is empty, newNode is
//both the first and last node
first = newNode;
last = newNode;
else //if the list is not empty, insert
//newNode after last
last.link = newNode; //insert newNode after last
last = newNode; //set last to point to the
//actual last node
count++;
}//end insertLast
//Method to delete deleteItem from the list.
//Postcondition: If found, the node containing
// deleteItem is deleted from the
// list. Also, first points to the first
// node, last points to the last
// node of the updated list, and count
// is decremented by 1.
public void deleteNode(T deleteItem)
LinkedListNode<T> current; //variable to traverse
//the list
LinkedListNode<T> trailCurrent; //variable just
//before current
boolean found;
if ( first == null) //Case 1; the list is empty
System.err.println("Cannot delete from an empty "
+ "list.");
else
if (first.info.equals(deleteItem)) //Case 2
first = first.link;
if (first == null) //the list had only one node
last = null;
count--;
else //search the list for the given info
found = false;
trailCurrent = first; //set trailCurrent to
//point to the first node
current = first.link; //set current to point to
//the second node
while (current != null && !found)
if (current.info.equals(deleteItem))
found = true;
else
trailCurrent = current;
current = current.link;
}//end while
if (found) //Case 3; if found, delete the node
count--;
trailCurrent.link = current.link;
if (last == current) //node to be deleted
//was the last node
last = trailCurrent; //update the value
//of last
else
System.out.println("Item to be deleted is "
+ "not in the list.");
}//end else
}//end else
}//end deleteNode
public void splitAt(LinkedListClass<T> secondList, T item)
LinkedListNode<T> current;
LinkedListNode<T> trailCurrent;
int i;
boolean found;
if (first==null)
System.out.println("Empty.");
first=null;
last=null;
count--;
count=0;
else
current=first;
found=false;
i=1;
while(current !=null &&!found)
if(current.info.equals(item))
found= true;
else
trailCurrent=first;
current=first;
i++;
if(found)
if(first==current)
first.link=first;
last.link=last;
count--;
count=0;
else
first.link=current;
last.link=last;
last=null;
count = count- i+1;
count = i-1;
} else {
System.out.println("Item to be split at is "
+ "not in the list.");
first=null;
last=null;
count=0;
Any help or just advice would be fine. Im not the best at Java, better at VB. Am completely stumped! Thanks so much! -
How to call java with public static void main(String[] args) throws by jsp?
how do i call this from jsp? <%spServicelnd temp = new spServicelnd();%> does not work because the program has a main. can i make another 2nd.java to call this spServiceInd.java then call 2nd.java by jsp? if yes, how??? The code is found below...
import java.net.MalformedURLException;
import java.io.IOException;
import com.openwave.wappush.*;
public class spServiceInd
private final static String ppgAddress = "http://devgate2.openwave.com:9002/pap";
private final static String[] clientAddress = {"1089478279-49372_devgate2.openwave.com/[email protected]"};
// private final static String[] clientAddress = {"+639209063665/[email protected]"};
private final static String SvcIndURI = "http://devgate2.openwave.com/cgi-bin/mailbox.cgi";
private static void printResults(PushResponse pushResponse) throws WapPushException, MalformedURLException, IOException
System.out.println("hello cze, I'm inside printResult");
//Read the response to find out if the Push Submission succeded.
//1001 = "Accepted for processing"
if (pushResponse.getResultCode() == 1001)
try
String pushID = pushResponse.getPushID();
SimplePush sp = new SimplePush(new java.net.URL(ppgAddress), "SampleApp", "/sampleapp");
StatusQueryResponse queryResponse = sp.queryStatus(pushID, null);
StatusQueryResult queryResult = queryResponse.getResult(0);
System.out.println("Message status: " + queryResult.getMessageState());
catch (WapPushException exception)
System.out.println("*** ERROR - WapPushException (" + exception.getMessage() + ")");
catch (MalformedURLException exception)
System.out.println("*** ERROR - MalformedURLException (" + exception.getMessage() + ")");
catch (IOException exception)
System.out.println("*** ERROR - IOException (" + exception.getMessage() + ")");
else
System.out.println("Message failed");
System.out.println(pushResponse.getResultCode());
}//printResults
public void SubmitMsg() throws WapPushException, IOException
System.out.println("hello cze, I'm inside SubmitMsg");
try
System.out.println("hello cze, I'm inside SubmitMsg (inside Try)");
//Instantiate a SimplePush object passing in the PPG URL,
//product name, and PushID suffix, which ensures that the
//PushID is unique.
SimplePush sp = new SimplePush(new java.net.URL(ppgAddress), "SampleApp", "/sampleapp");
//Send the Service Indication.
PushResponse response = sp.pushServiceIndication(clientAddress, "You have a pending Report/Request. Please logIn to IRMS", SvcIndURI, ServiceIndicationAction.signalHigh);
//Print the response from the PPG.
printResults(response);
}//try
catch (WapPushException exception)
System.out.println("*** ERROR - WapPushException (" + exception.getMessage() + ")");
catch (IOException exception)
System.out.println("*** ERROR - IOException (" + exception.getMessage() + ")");
}//SubmitMsg()
public static void main(String[] args) throws WapPushException, IOException
System.out.println("hello cze, I'm inside main");
spServiceInd spsi = new spServiceInd();
spsi.SubmitMsg();
}//main
}//class spServiceIndIn general, classes with main method should be called from command prompt (that's the reason for main method). Remove the main method, put the class in a package and import the apckage in your jsp (java classes should not be in the location as jsps).
When you import the package in jsp, then you can instantiate the class and use any of it's methods or call the statis methods directly:
<%
spServiceInd spsi = new spServiceInd();
spsi.SubmitMsg();
%> -
NEED HELP WITH USING STATIC METHOD - PLEASE RESPOND ASAP!
I am trying to set a value on a class using a static method. I have defined a servlet attribute (let's call it myAttribute) on my webserver. I have a serlvet (let's call it myServlet) that has an init() method. I have modified this init() method to retrieve the attribute value (myAttribute). I need to make this attribute value accessible in another class (let's call it myOtherClass), so my question revolves around not knowing how to set this attribute value on my other class using a static method (let's call it setMyStuff()). I want to be able to make a call to the static method setMyStuff() with the value of my servlet attribute. I dont know enough about static member variables and methods. I need to know what to do in my init() method. I need to know what else I need to do in myServlet and also what all I need in the other class as well. I feel like a lot of my problems revolve around not knowing the proper syntax as well.
Please reply soon!!! Thanks in advance.class a
private static String aa = "";
public static setVar (String var)
aa = var;
class b
public void init()
a.aa = "try";
public static void main(String b[])
b myB = new b ();
b.init();
hope this help;
bye _drag -
Need Help with install of Final Cut Pro HD
Hi
I am tryting to install FCP Express HD on my G4 Ibook and I get a strange error message. It was able to instaLL fine but when I got to run the program I get this message
Can't install unable to find easy setup file please reinstall and try again.
I have uninstalled and resinstalled 2x any ideas
Ibook g4 Mac OS X (10.4.3)Make sure you uninstall all the components of Final Cut. Do a search on your Finder. Then install from the installation disc. If this doesn't work you should contact Apple for help with installation issues. The disc may be defective.
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!! help using: public static Boolean valueOf(String s)
I am trying to use this simple function to convert a string value to a boolean. According to the documentation for this Boolean method (public static Boolean valueOf(String s)), this should work:
Example: Boolean.valueOf("True") returns true.
As a test, I tried to run this line of code:
tmp_bool = Boolean.valueOf("True");
I get this compilation error:
test_file.java:10: incompatible types
found : java.lang.Boolean
required: boolean
tmp_bool = Boolean.valueOf("True");
.....................................^
According to the documentation for SDK 1.4, there is a new function:
public static Boolean valueOf(boolean b)
It seems like the commpiler is focusing on this new version of the valueOf() method, and ignoring the case where a String is the parameter. Why won't it use the version that takes a String? What confuses me even more is that I am running version 1.3.1, and the new valueOf(boolean b) function is not mentioned in its documentation.
Am I somehow using the method wrong?
Thanks!OK, I think I understand now. Thanks.
Let me make sure i have this right...
So basically, if you use variable types of Boolean and need to pass them to methods that take booleans, would you have to call the booleanValue method first?
ex:
Boolean bool_obj;
//example method that takes a boolean
//test_method(boolean b);
test_method ( bool_obj.booleanValue() );
is that right? -
Help with multipule drop down lists in a select query
Hi I am trying to design a search query using 5 drop down lists coming from tables. the front end looks like this
I have the selections going to variables then by $_POST into the msqyl query my other code is
MY CODE FOR THE FORM IS
<form action="horse-events-devon.php?url_countyid=<?php echo urlencode ($url_countyid ['url_countyid']) ; ?>&go" method="POST">
<table id="searchtable">
<tr>
<th>Find By Discipline</th>
<th>Find By Venue</th>
<th>Find By Championship</th>
<th>Find By Organiser</th>
<th>Equine Association</th>
<th>Submit Your Selections</th>
</tr>
<tr>
<td><select name="dis_id">
<?php
$upcomingdis = upcomingdis($url_countyid);
$upcoming_dis_bycounty = mysql_fetch_assoc ($upcomingdis);
?>
<?php
do {
?> <option value="<?php echo $upcoming_dis_bycounty ['dis_id']; ?>" >
<?php echo $upcoming_dis_bycounty ['dis_description']; ?></option>
<?php
} while ($upcoming_dis_bycounty = mysql_fetch_assoc ($upcomingdis));
?></select></td>
<td><select name="ven_id">
<?php
$upvenbycounty_set = upcoming_venevents_bycounty($url_countyid);
$upcoming_ven_bycounty = mysql_fetch_assoc ($upvenbycounty_set);
?>
<?php
do {
?> <option value="<?php echo $upcoming_ven_bycounty ['ven_id']; ?>" >
<?php echo $upcoming_ven_bycounty ['ven_name']; ?></option>
<?php
} while ($upcoming_ven_bycounty = mysql_fetch_assoc ($upvenbycounty_set));
?></select></td>
<td><select name="champ_id">
<?php
$championship_set = findchampionships();
$champlist = mysql_fetch_assoc ($championship_set);
?>
<?php
do {
?> <option value="<?php echo $champlist ['champ_id']; ?>" >
<?php echo $champlist ['champ_description']; ?></option>
<?php
} while ($champlist = mysql_fetch_assoc ($championship_set));
?></select></td>
<td>
<select name="org_id">
<?php
$uporgbycounty_set = upcoming_organevents_bycounty($url_countyid);
$upcoming_org_bycounty = mysql_fetch_assoc ($uporgbycounty_set);
?>
<?php
do {
?> <option value="<?php echo $upcoming_org_bycounty ['org_id']; ?>" ><?php echo $upcoming_org_bycounty ['org_name']; ?></option>
<?php
} while ($upcoming_org_bycounty = mysql_fetch_assoc ($uporgbycounty_set));
?></select>
</td>
<td><select name="***_id">
<?php
$upassbycounty_set = upcoming_assevents_bycounty($url_countyid);
$upcoming_assbycounty = mysql_fetch_assoc ($upassbycounty_set);
?>
<?php
do {
?> <option value="<?php echo $upcoming_assbycounty ['***_id']; ?>" >
<?php echo $upcoming_assbycounty ['***_description']; ?></option>
<?php
} while ($upcoming_assbycounty = mysql_fetch_assoc ($upassbycounty_set));
?></select></td>
<td><input name="submit" type="submit" /><input name="countyid" type="hidden" value="<?php echo $url_countyid ['url_countyid']; ?>" /></td>
</tr>
</table>
</form>
<?php
if (isset($_POST['submit'])){
if (isset($_GET['go'])){
$countyid = $_POST['countyid'];
$ven_id = $_POST['ven_id'];
$dis_id = $_POST['dis_id'];
$champ_id = $_POST['champ_id'];
$org_id = $_POST['org_id'];
$event_id = $row['event_id'];
$sql = "SELECT DATE_FORMAT (events.startdate, '%a, %d, %b')
AS stdate, events.event_id, events.title, events.ven_id, events.org_id,
venue.county_id, venue.ven_id, eventdisciplines.event_id, eventdisciplines.dis_id, county.county_id, discipline.dis_id \n"
. "FROM events \n"
. "LEFT OUTER JOIN eventdisciplines \n"
. "ON events.event_id = eventdisciplines.event_id \n"
. "LEFT OUTER JOIN discipline \n"
. "ON eventdisciplines.dis_id = discipline.dis_id \n"
. "LEFT OUTER JOIN venue \n"
. "ON events.ven_id = venue.ven_id \n"
. "LEFT OUTER JOIN county \n"
. "ON venue.county_id = county.county_id \n"
. "WHERE events.ven_id = ({$ven_id} OR events.org_id = {$org_id})\n"
. "AND events.startdate > NOW()\n"
. "AND venue.county_id = {$countyid} \n"
. "ORDER BY startdate ASC";
$result = mysql_query ($sql, $connection);
?>
My problem is at the WHERE point, how do I code for single and multipule selections, The . "WHERE events.ven_id = ({$ven_id} OR events.org_id = {$org_id})\n" throws and error.
How am I best programing this type of query, ?? Should it be with php ??The best thing is to dynamically build your where clause based on the user selection. Test the values of all form fields and if the user does not make a selection, do not include that in the where clause.
Trying to build a single, static where clause that accounts for all possible user input permutations is extremely difficult. -
Help with creating a price list
I'm just wondering if anybody could possibly help me when creating a price list?. I'm new to SAP so don't have a great knowledge of it.
Our company needs to send out a wholesale price list to customers, however some of the items we stock do not include vat, when the price list is previewed it doesnt show which items include vat or exclusive of vat. this information could do with being visible to make it clearer to the customers.
Is there anyway the priclist could be exported to microsoft excel etc for editing?
many thanks.go to inventory--prce lists-Price List.
double click on the price list you want.
It will open the new window showing Items with prices.
Click on the Excel icon on menu bar on the top.
save file as .xls. -
Help with public function (accessing to addchild object from other public function)
Hi, i have below piece of my code AS3 (Flash CS4). I would like to get access to addchild Movie Clip object (ZoltyWjazdMC) in function two() which i created by addchild command in public function one(). I know it`s basic question but i can`t find answer for it. Anybody would help me with that?
public function one():void
var ZoltyWjazdMC:MovieClip = new MovieClip();
this.addChild(ZoltyWjazdMC);
ZoltyWjazdMC.addChild(assets.ZoltyWjazd.loader);
this.setChildIndex(ZoltyWjazdMC,1);
ZoltyWjazdMC.alpha = 0;
ZoltyWjazdMC.visible = true;
assets.ZielonyWjazd.alpha = 1;
public function two():void
ZoltyWjazdMC.alpha = 1;
Do i need remove "this" and change it to "stage". Is it necessary?Define your variable var ZoltyWjazdMC:MovieClip outside of function one(). Currently ZoltyWjazdMC is local to function one() so that function two() does not understand what it is!
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