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Array.java

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package Dynamic;

import javax.sound.sampled.DataLine;

public class Array<E> {

private E[] data;

private int size;

public Array(int capacity) {

data = (E[]) new Object[capacity];

size = 0;

}

public Array() {

this(10);

}

public int getSize() {

return size;

}

public int getCapacity() {

return data.length;

}

public boolean isEmpty() {

return size == 0;

}

public void add(int index,E e){

if(index <0 || index>size){

throw new IllegalArgumentException("the index is error");

}

for(var i= size-1;i>=index;i--){

data[i+1] = data[i];

}

data[index] = e;

size++;

if(size==data.length){

resize(2*data.length);

}

}

public void addFirst(E e){

add(0,e);

}

public void addLast(E e){

add(size,e);

}

public E get(int index){

if(index < 0 || index > size){

throw new IllegalArgumentException("the index is error");

}

return data[index];

}

public void set(int index, E e){

if(index < 0 || index > size){

throw new IllegalArgumentException("the index is error");

}

data[index] = e;

}

public boolean contains(E e){

for (var i=0;i<size;i++){

if(data[i]==e)

return true;

}

return false;

}

public int find(E e){

for (var i=0;i<size;i++){

if(data[i]==e){

return i;

}

}

return -1;

}

public E remove(int index){

if(index <0 || index >=size){

throw new IllegalArgumentException("the index is error");

}

var result = data[index];

for (var i= index+1;i<size;i++){

data[i-1] = data[i];

}

size--;

data[size]=null;

if(size==data.length/4 && data.length/2 !=0){

resize(data.length/2);

}

return result;

}

public E removeFirst(){

return remove(0);

}

public E removeLast(){

return remove(size-1);

}

public void removeElement(E e){

var index = find(e);

if(index!=-1){

remove(index);

}

}

private void resize(int newCapacity){

var newData = (E[])new Object[newCapacity];

for (var i=0;i<size;i++){

newData[i] = data[i];

}

data = newData;

}

@Override

public String toString()

{

var res = new StringBuilder();

res.append(String.format("Array:size=%d,capacity=%d\n",size, data.length));

res.append("[");

for(var i=0;i<size;i++){

res.append(data[i]);

if(i!=size-1)

res.append(",");

}

res.append("]");

return res.toString();

}

}