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package arrays.myArray;
public class MyArrayList {
 private Object[] arrObj = new Object[3];
 private int size = 0;
 
 // ³¤¶È
 public int size() {
  return size;
 }
 // insert
 public void add(Object obj) {
  add(size,obj);
 }
 // update
 // °ÑÇ°ÃæµÄÍùºóÒÆ¶¯
 public void add(int index, Object obj) {
  if(size==arrObj.length){
   Object[] temp=new Object[size*2];
   for(int i=0;i<arrObj.length;i++){
    temp[i]=arrObj[i];
   }
   arrObj=temp;
  }
  //´ÓǰÍùºó
  for (int i =size; i>index ; i--) {
   arrObj[i] = arrObj[i-1];
  }
  arrObj[index]=obj;
  size++;
 }
 // delete
 // °ÑºóÃæµÄÍùÇ°ÒÆ¶¯
 public void remove(int index) {
  size--;
  for (int i =index;i<size; i++) {
   arrObj[i] = arrObj[i+1];
  }
 }
 public Object get(int index) {
  return arrObj[index];
 }
}


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