复制数组

Question

 private void resize(int i) {                         
   this.capacity +=i;                           // new capacity
   this.memoryaux = new Integer[this.capacity]; // create array aux with new capacity
   for (int a = 0; a < this.capacity; a++)
     this.memoryaux[a] = null;                  // initialize null
   this.memory = this.memoryaux;                // copy array aux into my array             
 } 

Answer 1

您正在查找公共静态t[]Arrays.CopyOf(t[]original,int newLength）。

您需要指定一个大于旧长度的新长度。这将把现有的数组复制到一个新的更大的数组中。

// Intializing an array of length 3
int[] array = new int[] {45, 32, 75};
// Copying array with newlength as 5
array = Arrays.copyOf(array, 5);
array[3] = 11;
array[4] = 55;   

or-在1.6之前的Java中使用public static void system.arraycopy（对象src,int srcPos,对象dest,int destPos,int length）

// Intializing an array of length 3
int[] array = new int[] {45, 32, 75};
// Copying array with newlength as 5
int[] biggerArray = new int[5];
System.arraycopy(array, 0, biggerArray, 0, array.length);
biggerArray [3] = 11;
biggerArray [4] = 55;