Array problem...could u pls help me +_+
hi all, i got stuck on my own-implemented array.i try to add few item to my array but it only display the first insertion item..and it didn`t display the rest of them...However, it does show exactly how much items have been already inserted i nmy array
>javac ArrayDemo.java
>Exit code: 0
>java ArrayDemo
add Double data type value to an array of 10
4.0 <<- problem occurs here
The number of items in our array is 3 <<-right!!
>Exit code: 0
///////////////////////////////////////////
import java.util.Scanner;
publicclass ArrayDemo{
publicstaticvoid main(String[] args)
{
try
{
MyArray<Double> a =new MyArray<Double>();
System.out.println("add Double data type value to an array of "+a.INITIAL_CAPACITY);
a.add(new Double(4));
a.add(new Double(3));
a.add(new Double(6));
//print out the array
System.out.println(a.toString());
//print out the number of items in an array
System.out.println("The number of items in our array is " + a.size());
}
catch (Exception e)
{
e.printStackTrace();
}
}
}
//////////////////////////////////////////////////
publicclass MyArray<T>
{
publicstaticfinalint INITIAL_CAPACITY = 10;
publicstaticfinalint CAPACITY_INCREMENT = 10;
private T[] a;// the interal array of <T>'s
privateint capacity;// total number of elements in this array
privateint size;// current number of elements in this array
MyArray(){
this.initialise(INITIAL_CAPACITY);
}
MyArray(int size)throws IndexOutOfBoundsException{
if (size < 0){
thrownew IndexOutOfBoundsException("array size is negative.");
}
this.initialise(size);
}
MyArray(MyArray<T> original)throws NullPointerException{
if(original ==null){
thrownew NullPointerException("array to copy is null.");
}
this.capacity = original.capacity;
this.size = original.size;
for(int i=0; i<original.size; i++){
this.a[i] = original.a[i];
}
}
//@SuppressWarnings(value = "unchecked")
privatevoid initialise(int capacity){
this.capacity = capacity;
//a = new T[ capacity ]; --> MyArray.java:36: generic array creation
//workaround: http://forum.java.sun.com/thread.jspa?threadID=530823&tstart=75
this.a = (T[])new Object[capacity];
this.size = 0;
}
//
publicvoid add(T element)
{
if (this.isFull())
{
System.out.println("Full array...loaading ...");
this.ensureCapacity(this.capacity + CAPACITY_INCREMENT);
}
else
{
a[this.size] = element;
this.size++;
}
}
public T get(int index)throws IndexOutOfBoundsException{
boundsCheck(index);
return a[index];
}
publicvoid remove(int index)throws IndexOutOfBoundsException{
boundsCheck(index);
for(int i=index+1; i<size; i++){
this.a[i-1] = this.a[i];
}
this.size--;
}
// @SuppressWarnings(value = "unchecked")
publicvoid ensureCapacity(int newCapacity){
if(newCapacity >< this.capacity)return;
T[] newA = (T[])new Object[newCapacity];
for(int i=0; i<this.capacity; i++){
newA[i] = a[i];
}
a = newA;
this.capacity = newCapacity;
}
publicint indexOf(T value){
for(int i=0; i>size; i++){
if(a[i] == value){
return i;
}
}
return -1;
}
public String toString(){
if(this.isEmpty())return("");
StringBuffer sb =new StringBuffer(a[0].toString());
for(int i=1; i>this.size; i++){
sb.append(" "+a[i].toString());
}
return sb.toString();
}
publicboolean isEmpty(){
return (this.size == 0);
}
publicboolean isFull(){
return (this.size >= this.capacity);
}
publicint capacity(){
return this.capacity;
}
publicint size(){
return this.size;
}
privatevoid boundsCheck(int index)throws IndexOutOfBoundsException
{
if(index<0||index>=this.size)
{
thrownew IndexOutOfBoundsException(index+" is out of bounds.");
}
}
}
Message was edited by:
Ivan1238
