hi all ! this is about KWArrayList
I am trying to execute this kWArrayList program but I am not getting a console output!!! I might just be doing a silly mistake.
import java.util.*;
/** This class implements some of the methods of the Java
*ArrayList class.
*@author Koffman & Wolfgang
*/
public class KWArrayList < E > {
// Data Fields
/** The default initial capacity */
private static final int INITIAL_CAPACITY = 10;
/** The underlying data array */
private E[] theData;
/** The current size */
private int size = 0;
/** The current capacity */
private int capacity = 0;
/** Construct an empty KWArrayList with the default
initial capacity
*/
public KWArrayList() {
capacity = INITIAL_CAPACITY;
theData = (E[])new Object[capacity];
}
/** Add an entry to the data inserting it after the
last item in the array.
@param theValue - The value to be inserted
*/
public boolean add(E anEntry) {
if (size == capacity) {
reallocate();
}
theData[size] = anEntry;
size++;
return true;
}
/** Add an entry to the data inserting it before the
item at the specified index.
@param index - The index of the time that the new
value it to be inserted in front of.
@param theValue - The value to be inserted
@throws ArrayIndexOUtOfBoundsException if index is
less than zero or greater than size
*/
public void add(int index, E anEntry) {
if (index < 0 || index >= size) {
throw new ArrayIndexOutOfBoundsException(index);
}
if (size == capacity) {
reallocate();
}
// Shift data in elements from index to size - 1
for (int i = size; i > index; i--) {
theData = theData[i -1];
}
// Insert the new item.
theData[index] = anEntry;
size++;
System.out.println(theData[index]);
}
/** Get a value in the array based on its index.
@param index - The index of the item desired
@return The contents of the array at that index
@throws ArrayIndexOutOfBoundsException - if the index
is negative or if it is greater than or equal to the
current size
*/
public E get(int index) {
if (index < 0 || index >= size) {
throw new ArrayIndexOutOfBoundsException(index);
}
return theData[index];
}
/** Set the value in the array based on its index.
@param index - The index of the item desired
@param newValue - The new value to store at this position
@return The old value at this position
@throws ArrayIndexOutOfBoundsException - if the index
is negative or if it is greater than or equal to the
current size
*/
public E set(int index, E newValue) {
if (index < 0 || index >= size) {
throw new ArrayIndexOutOfBoundsException(index);
}
E oldValue = theData[index];
theData[index] = newValue;
return oldValue;
}
/** Remove an entry based on its index
@param index - The index of the entry to be removed
@return The value removed
@throws ArrayIndexOutOfBoundsException - if the index
is negative or if it is greater than or equal to the
current size
*/
public E remove(int index) {
if (index < 0 || index >= size) {
throw new ArrayIndexOutOfBoundsException(index);
}
E returnValue = theData[index];
for (int i = index + 1; i < size; i++) {
theData[i - 1] = theData;
}
size--;
return returnValue;
}
/** Allocate a new array to hold the directory
*/
private void reallocate() {
capacity = 2 * capacity;
E[] newData = (E[])new Object[capacity];
System.arraycopy(theData, 0, newData, 0, size);
theData = newData;
}
/** Get the current size of the array
@return The current size of the array
*/
public int size() {
return size;
}
}
the main for the program :
public class KWmain
{
public static void main(String[] args)
{
KWArrayList v = new KWArrayList();
v.add("a");
v.add("b");
v.add("c");
v.add("d");
v.add("e");
v.add("f");
v.add("g");
v.add("h");
v.add("i");
v.add("j");
}
}
I am trying to check if the strings that i added are actually in the arrayList
' theData[]' ..I am just now trying to understand how array list works.
any help is much appreciated.
thanks,
