Package com.tailf.util

Class ArrayTool

Object

com.tailf.util.ArrayTool

public class ArrayTool
extends Object

Tools for array manipulation.

Constructor Summary

Constructors

Constructor	Description
ArrayTool()

Method Summary

Modifier and Type	Method	Description
static Object[]	concatArrays(Object[] a, Object o)	Creates and copy a new array that has appended a object in the end of a source array
static Object[]	concatArrays(Object[] a, Object[] b)	Creates a copies a new array that is the concatenation of two.
static <T> T[]	copyOfRange(T[] original, int from, int to)	Returns a subarray from the original array from from to to.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

ArrayTool

public ArrayTool()

Method Details

concatArrays

public static Object[] concatArrays(Object[] a,
 Object[] b)

Creates a copies a new array that is the concatenation of two.

Parameters:

a - first array in the copy

b - second array in the copy

Returns:

new array

copyOfRange

public static <T> T[] copyOfRange(T[] original,
 int from,
 int to)

Returns a subarray from the original array from from to to. Copies the specified range of the specified array into a new array.

The initial index of the range (from) must lie between zero and original.length, inclusive. The value at original[from] is placed into the initial element of the copy (unless from == original.length or from == to).

Values from subsequent elements in the original array are placed into subsequent elements in the copy. The final index of the range (to), which must be greater than or equal to from, may be greater than original.length, in which case null is placed in all elements of the copy whose index is greater than or equal to original.length - from. The length of the returned array will be to - from.

The resulting array is of exactly the same class as the original array.

Parameters:

original - the array from which a range is to be copied

from - the initial index of the range to be copied, inclusive

to - the final index of the range to be copied, exclusive. (This index may lie outside the array.)

Returns:

a new array containing the specified range from the original array, truncated or padded with nulls to obtain the required length

Throws:

ArrayIndexOutOfBoundsException - if from < 0 or from > original.length

IllegalArgumentException - if from > to

NullPointerException - if original is null

concatArrays

public static Object[] concatArrays(Object[] a,
 Object o)

Creates and copy a new array that has appended a object in the end of a source array

Parameters:

a - source array

o - object to append

Returns:

new array