Some Exceptions issues

[fleg]

Hello i should write a program which simulates a desk and you are putting workItems on it (array have to be used) and there should be used some Exceptions with which i cant move... if someone would be so kind and help me with it

<code>
public interface WorkStack
{

/**
* Checks whether the stack is empty.
*
* @return true if the stack is empty,
* false otherwise
*/
boolean isEmpty();

/**
* Inserts a new work item to the stack.
*
* @param item work item which will be inserted to the stack
* @return true if the item is successfully inserted,
* false otherwise (e.g. if the stack is full)
* @throws NullPointerException if the parameter item is null.
*/
boolean push(WorkItem item);

/**
* It retrieves and removes the first item (top item) of the stack.
* Returns null if the stack is empty.
*
* @return the top item of the stack,
* or null if the stack is empty.
*/
WorkItem pop();

/**
* It returns a position of the given work item in "to do list".
* When the work item is on the top of the stack the position is 1,
* when the work item is on the bottom of the stack, the position is number of items in the stack.
*
* @param item a work item
* @return position of the work item
* @throws NullPointerException if the parameter item is null.
* @throws IllegalArgumentException if the stack does not contain the given work item.
*/
int getItemPosition(WorkItem item);
}
</code>

<code>
public class Table implements WorkStack
{
private WorkItem toDoList[];
private int stack;
private WorkItem item;
public Table (int stack){

if (stack<0) {
throw new IllegalArgumentException("Cant be such a tiny table");
}

this.stack=stack;


}

public boolean isEmpty(){
return (toDoList[0]==null);
}

public boolean push(WorkItem item){
if (toDoList.length<=stack){
toDoList[toDoList.length+1]=item;
return true;
}else{
return false;
}
}

public WorkItem pop(){
if (isEmpty()){
return null;
}else{
return toDoList[0];
}
}

public int getItemPosition(WorkItem item){
for(int i=0;i<toDoList.length;i++){
try { //these 2 exceptions are pain in the ass
if (equals(item)){
return i+1;
}else{

return null;

}
}catch (NullPointerException npe){
System.err.println("Here should be something written");
}


}
}
}
</code>

and it would be nice if you check that code above if there arent some bullshits... this is the last part

<code>
public class WorkItem
{

private String name;

/**
* It creates a new work item with the specified name.
*
* @param name name of the work item
* @throws NullPointerException if the name is null
*/
public WorkItem(String name) {
if (name == null) {
throw new NullPointerException("The name of the work item can't be set to NULL");
}
this.name = name;
}

/**
* It returns true if the given object is instance of this class
* and has the same name.
*
* @param object
* @return true if the given object equals to this one
* false otherwise
*/
public boolean equals(Object o) {
if (o == null) return false;
if (!(o instanceof WorkItem)) return false;
WorkItem item = (WorkItem) o;
return item.getName().equals(getName());
}

/**
* It returns the hashcode of the name of the work item
*
* @return hash code
*/
public int hashCode() {
return getName().hashCode();
}

/**
* @return name of the work item
*/
public String getName() {
return name;
}

@Override
public String toString() {
return getName();
}
}
</code>

[Tolls]

The brackets around code should be [] not <>.

What is your problem?