package com.customArray0905;
public class CustomArraryList<E> {
 Object[] data;
 int Size;

 public int getSize() {
  return Size;
 }

 //返回數(shù)組下標(biāo)為index的元素的值
 public E get(int index) {
  if(index<0 || index>=Size) {
   throw new IndexOutOfBoundsException();
   //否則return null
  }
  return (E) data[index];
 }

 //自定義更改下標(biāo)為index的元素值的方法
 public void set(int index, E e) {
  if(index<0 || index>=Size) {
   throw new IndexOutOfBoundsException();
   //否則return null
  }
  data[index] = e;
 }

 public void add(E e) {
  ///創(chuàng)建新對象 容量擴大一個
  Object[] newdata = new Object[Size + 1];
  //將array中的元素重新存入更新容量后的newArray數(shù)組中去
  for (int i = 0; i < Size; i++) {
   newdata[i] = data[i];
  }
  data = newdata;
  data[Size++] = e;
 }
 //自定義移除下標(biāo)為index的元素的方法
 public void remove(int index) {
  ///創(chuàng)建新對象 容量減少一個
  Object[] newdata = new Object[Size - 1];
  int j = 0;

  //判斷index大小是否合適存在數(shù)組中
  if(index<0 || index>=Size) {
   throw new IndexOutOfBoundsException();
   //否則return null
  }
   //得到老對象里下標(biāo)之前的所有元素并存入新對象
   for (int i = 0; i < index; i++) {
    newdata[j] = data[i];
    j++;
   }
   //得到老對象里下標(biāo)之后的所有元素并存入新對象
   for (int i = index + 1; i < Size; i++) {
    newdata[j] = data[i];
    j++;
   }
   data = newdata;
   Size--;
 }
 //清除array中所有的元素
 public void clear() {
  for(int i = 0;i<Size;i++) {
   data[i] = null;
  }
  Size = 0;
 }

 public static void main(String[] args) {
  CustomArraryList<String> myList = new CustomArraryList<>();
  //Add
  System.out.println("測試1,ADD方法");
  myList.add("1");
  myList.add("2");
  myList.add("3");
  myList.add("4");
  myList.add("5");
  for (int i = 0; i < myList.getSize(); i++) {
   System.out.println(myList.get(i));
  }

  //Remove,Set
  myList.remove(2);
  myList.set(3, "7");
  System.out.println("測試2,移除index=2的數(shù)據(jù),并設(shè)置index=3的數(shù)據(jù)值為7,");
  for (int i = 0; i < myList.getSize(); i++) {
   System.out.println(myList.get(i));
  }

  //Clear
  myList.clear();
  myList.add("1");
  for (int i = 0; i < myList.getSize(); i++) {
   System.out.println("測試3,clear方法，僅剩下新添加數(shù)據(jù) "+myList.get(i));
  }
  //拋出錯誤
  System.out.println("測試4,拋出set錯誤");
  myList.set(2,"2");

 }
}

public static strictfp void main(String[] args) {
 
 String[][] arr = {{"aaa","bbb"},{"ccc"}};
 for(int x=0;x<arr.length;x++){
  for(int y=0;y<arr[x].length;y++){
  System.out.println(arr[x][y]);
  }
 }
 
 //Arrays.deepToString 快速打印一個二維數(shù)組的數(shù)據(jù)元素列表 
 System.out.println(Arrays.deepToString(arr));
 }