无法应用java系统copyarray对象>int[]？

Question

我试着：

private int[] data = new int[1];
int[] newArr = new int[1];
System.arraycopy(data, 0, newArr, data.length);

但我得到了：

error: method arraycopy in class System cannot be applied to given types;
                System.arraycopy(data, 0, newArr, data.length);
                      ^
  required: Object,int,Object,int,int
  found: int[],int,int[],int
  reason: actual and formal argument lists differ in length
1 error

Compilation Failed

我确信拷贝任何我做错的东西都可以吗

Answer 1

你只是错过了方法的最后一个参数，here'sjavadoc，下面是它在参数中所说的：

src - the source array.

srcPos - starting position in the source array.

dest - the destination array.

destPos - starting position in the destination data.

length - the number of array elements to be copied.

下面应该是可行的：

int[] data = new int[1];
int[] newArr = new int[1];
System.arraycopy(data, 0, newArr, 0, data.length);
System.out.println(Arrays.toString(newArr));

Answer 2

如前所述，你错过了一场辩论。但由于要复制整个阵列，还可以使用更简单的方法：

int[] newArr = data.clone();