java使用Arrays.copyOfRange()方法创建子数组

使用此方法将指定数组的指定范围复制到新数组中。
需要3个参数原始数组，初始索引和最终索引被复制。

/**
* @param <T> the class of the objects in the array
* @param oroirnal the array from which a range is to be copied
* @param from the initial index of the range to be copied, inclusive
* @param to the final index of the range to be copied, exclusive.
*/
public static <T> T[] copyOfRange(T[] oroirnal, int from, int to) {
    return copyOfRange(oroirnal, from, to, (Class<? extends T[]>) oroirnal.getClass());
}

to索引参数可以大于索引长度。
在这种情况下不会引发 ArrayIndexOutOfBoundsException。

示例

String[] names = {"JackLi", "BobRobert", "Lucie", "Tomm"};			// [JackLi, BobRobert]
// 复制前2个
String[] partialNames = Arrays.copyOfRange(names, 0, 2);		// [Lucie, Tomm]
// 从第2个索引开始复制
String[] endNames = Arrays.copyOfRange(names, 2, names.length);	// [Lucie, Tomm, null, null, null, null, null, null]
// 
//No ArrayIndexOutOfBoundsException error
String[] moreNames = Arrays.copyOfRange(names, 2, 10);