System.arraycopy获取java.lang.ArrayIndexOutOfBoundsException [英] System.arraycopy getting java.lang.ArrayIndexOutOfBoundsException

问题描述

System.arraycopy获取ava.lang.ArrayIndexOutOfBoundsException ..我正在尝试将数据从一个数组复制到下一个数组。但是我遇到了一个例外

System.arraycopy getting ava.lang.ArrayIndexOutOfBoundsException.. I am trying to copy data from one array to the next. but I am getting a exception

private String array[] = { "NO DATA YET" };


 private void setListData()
    {
        String array2[] = { "Iphone", "Tutorials", "Gallery", "Android",    "item 1", "item 2", "item3", "item 4" };
        System.arraycopy(array2, 0, array, 0, array2.length);
    }

推荐答案

您正在尝试复制长度为1的数组中有8个项目。您不能这样做。

You're trying to copy 8 items into an array of length 1. You can't do that.

来自文档：

否则，如果以下任何一项为真，则抛出IndexOutOfBoundsException且目标未修改：

Otherwise, if any of the following is true, an IndexOutOfBoundsException is thrown and the destination is not modified:

• srcPos参数为负。


• destPos参数为负。


• length参数为负。


• srcPos + length大于源数组的长度src.length。


• destPos + length大于目标数组的长度dest.length

• The srcPos argument is negative.
• The destPos argument is negative.
• The length argument is negative.
• srcPos+length is greater than src.length, the length of the source array.
• destPos+length is greater than dest.length, the length of the destination array.

在这种情况下， destPos +长度为8 ，并且 dest.length 为1，因此抛出异常

In this case, destPos + length is 8, and dest.length is 1, hence the exception is being thrown.

请注意，Java中的数组具有固定的长度。如果要使用可扩展容器，请查看 ArrayList 。

Note that arrays in Java have a fixed length. If you want an expandable container, look at ArrayList.

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