java中删除 数组中的指定元素方法

import java.util.Arrays;
import org.apache.commons.lang3.ArrayUtils;
/**
 *
 * Java program to show how to remove element from Array in Java
 * This program shows How to use Apache Commons ArrayUtils to delete
 * elements from primitive array.
 *
 */
public class RemoveObjectFromArray{
  public static void main(String args[]) {
         
    //let's create an array for demonstration purpose
    int[] test = new int[] { 101, 102, 103, 104, 105};
   
    System.out.println("Original Array : size : " test.length );
    System.out.println("Contents : " Arrays.toString(test));
   
    //let's remove or delete an element from Array using Apache Commons ArrayUtils
    test = ArrayUtils.remove(test, 2); //removing element at index 2
   
    //Size of array must be 1 less than original array after deleting an element
    System.out.println("Size of array after removing an element : " test.length);
    System.out.println("Content of Array after removing an object : "
              Arrays.toString(test));
   
  }
 
}
Output:
Original Array : size : 5
Contents : [101, 102, 103, 104, 105]
Size of array after removing an element : 4
Content of Array after removing an object : [101, 102, 104, 105]

 public static int[] remove(int[] array, int index) {
    return (int[])((int[])remove((Object)array, index));
  }

private static Object remove(Object array, int index) {
    int length = getLength(array);
    if(index >= 0 && index < length) {
      Object result = Array.newInstance(array.getClass().getComponentType(), length - 1);
      System.arraycopy(array, 0, result, 0, index);
      if(index < length - 1) {
        System.arraycopy(array, index 1, result, index, length - index - 1);
      }
      return result;
    } else {
      throw new IndexOutOfBoundsException("Index: " index ", Length: " length);
    }
  }