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GeezerVison is showing github.com — data-structure/ArrayStack/src/Array.java at master · developbiao/data-structure

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import java.util.Arrays;
public class Array<E> {
private E[] data;
private int size;
/**
*
* construct
* @param capacity
*/
public Array(int capacity) {
this.data = (E[]) new Object[capacity];
this.size = 0;
}
public Array() {
this(10);
}
/**
* get size
* @return
*/
public int getSize() {
return this.size;
}
/**
* get capacity
* @return
*/
public int getCapacity() {
return this.data.length;
}
public boolean isEmpty() {
return this.size == 0;
}
public void addLast(E e) {
this.add(this.size, e);
}
public void addFirst(E e) {
this.add(0, e);
}
public void add(int index, E e) {
if(this.size == this.data.length) {
throw new IllegalArgumentException("AddLast failed. Array is full.") ;
}
if(index < 0 || index > size)
{
throw new IllegalArgumentException("Add failed. Required index >=0 and <= size.");
}
for(int i = this.size - 1; i >= index; i--)
{
this.data[i + 1] = this.data[i];
}
this.data[index] = e;
size ++;
}
/**
*
* Get element by index
* @param index
* @return
*/
public E get(int index) {
if( index < 0 || index > this.size) {
throw new IllegalArgumentException("Get failed. Index is illegal.");
}
return this.data[index];
}
public E getLast()
{
return data[size - 1];
}
/**
* Set value with index
* @param index
* @param e
*/
public void set(int index, E e) {
if(index < 0 || index > this.size) {
throw new IllegalArgumentException("Get failed. Index is illegal.");
}
this.data[index] = e;
}
/**
* Query element contains in the array
* @param e
* @return
*/
public boolean contains(E e) {
for(int i = 0; i < data.length; i++) {
if(data[i] == e) {
return true;
}
}
return false;
}
/**
* find element index when not found return -1
* @param e
* @return
*/
public int find(E e) {
for(int i = 0; i < data.length; i++) {
if(data[i] == e) {
return i;
}
}
return -1;
}
/**
* Remove element by index
* @param index
* @return
*/
public E remove(int index) {
if(index < 0 || index > size) {
throw new IllegalArgumentException("Remove failed, Index is illegal.");
}
E ret = data[index];
for(int i = index + 1; i < size; i++) {
data[i - 1] = data[i];
}
size --;
return ret;
}
/**
* remove first element
* @return
*/
public E removeFirst() {
return remove(0);
}
/**
*
* remove last element
* @return
*/
public E removeLast() {
return remove(size - 1);
}
/**
* remove element with array
* @param e
*/
public void removeElement(E e) {
int index = find(e);
if(index != -1) {
remove(index);
}
}
@Override
public String toString() {
StringBuilder res = new StringBuilder();
res.append(String.format("Array: size = %d, capacity = %d\n",this.size , this.getCapacity() ) );
res.append('[');
for (int i=0; i < this.size; i++) {
res.append(data[i]);
if(i != this.size - 1)
{
res.append(", ");
}
}
res.append(']');
return res.toString();
}
private void resize(int newCapacity)
{
E[] newData = (E[]) new Object[newCapacity];
for(int i = 0; i< size; i++) {
newData[i] = data[i];
}
data = newData;
}
}
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