Java数组添加元素实例

import java.util.Arrays;
 
public class MainClass {
  public static void main(String args[]) throws Exception {
   int array[] = { 2, 5, -2, 6, -3, 8, 0, -7, -9, 4 };
   Arrays.sort(array);
   printArray("数组排序", array);
   int index = Arrays.binarySearch(array, 1);
   System.out.println("元素 1 所在位置（负数为不存在）："
   + index); 
   int newIndex = -index - 1;
   array = insertElement(array, 1, newIndex);
   printArray("数组添加元素 1", array);
  }
  private static void printArray(String message, int array[]) {
   System.out.println(message
   + ": [length: " + array.length + "]");
   for (int i = 0; i < array.length; i++) {
     if (i != 0){
      System.out.print(", ");
     }
     System.out.print(array[i]);     
   }
   System.out.println();
  }
  private static int[] insertElement(int original[],
  int element, int index) {
   int length = original.length;
   int destination[] = new int[length + 1];
   System.arraycopy(original, 0, destination, 0, index);
   destination[index] = element;
   System.arraycopy(original, index, destination, index
   + 1, length - index);
   return destination;
  }
}