com.varra.util

Class ArrayUtils

java.lang.Object

com.varra.util.ArrayUtils

@InterfaceAudience.Public
 @InterfaceStability.Evolving
public final class ArrayUtils
extends Object

Array related general day to day used operations.

Version:

1.0

Author:

Rajakrishna V. Reddy

Field Summary

Fields

Modifier and Type	Field and Description
static int	INDEX_NOT_FOUND The index value when an element is not found in a list or array: -1.

Method Summary

Modifier and Type	Method and Description
static <T> boolean	contains(T objectToFind, T[] array) Checks whether the given object to find is in the array.
static <T> boolean	empty(T... array) Deprecated.
static <T> int	indexOf(T objectToFind, int startIndex, T[] array) Finds the index of the given object in the array starting at the given index.
static <T> int	indexOf(T objectToFind, T[] array) Finds the index of the given object in the array.
static <T> boolean	isEmpty(T... array) Checks whether the given array is empty.
static <T,SizeType> SizeType	length(T... array) Is used to get the array size in Integer or Long or.
static <T> Set<T>	toSet(T[] indexes) Converts the array to set of same type.

Methods inherited from class java.lang.Object

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

Field Detail

INDEX_NOT_FOUND

public static final int INDEX_NOT_FOUND

The index value when an element is not found in a list or array: -1. This value is returned by methods in this class and can also be used in comparisons with values returned by various method from List.

See Also:

Constant Field Values

Method Detail

contains

public static <T> boolean contains(T objectToFind,
                                   T[] array)

Checks whether the given object to find is in the array.

Type Parameters:

T - the generic type

Parameters:

objectToFind - the object to find

array - the array

Returns:

true, if successful

indexOf

public static <T> int indexOf(T objectToFind,
                              T[] array)

Finds the index of the given object in the array.

This method returns INDEX_NOT_FOUND (-1) for a null input array.

Type Parameters:

T - the generic type

Parameters:

objectToFind - the object to find, may be null

array - the array to search through for the object, may be null

Returns:

the index of the object within the array, INDEX_NOT_FOUND (-1) if not found or null array input

indexOf

public static <T> int indexOf(T objectToFind,
                              int startIndex,
                              T[] array)

Finds the index of the given object in the array starting at the given index.

This method returns INDEX_NOT_FOUND (-1) for a null input array.

A negative startIndex is treated as zero. A startIndex larger than the array length will return INDEX_NOT_FOUND (-1).

Type Parameters:

T - the generic type

Parameters:

objectToFind - the object to find, may be null

startIndex - the index to start searching at

array - the array to search through for the object, may be null

Returns:

the index of the object within the array starting at the index, INDEX_NOT_FOUND (-1) if not found or null array input

length

public static <T,SizeType> SizeType length(T... array)

Is used to get the array size in Integer or Long or.

Type Parameters:

T - the generic type

SizeType - the generic type

Parameters:

array - the array

Returns:

the size type Double based on the request.

empty

@Deprecated
public static <T> boolean empty(T... array)

Deprecated.

Checks whether the given array is empty.

Type Parameters:

T - the generic type

Parameters:

array - the a

Returns:

true, if successful

See Also:

isEmpty(Object...)

isEmpty

public static <T> boolean isEmpty(T... array)

Checks whether the given array is empty.

Type Parameters:

T - the generic type

Parameters:

array - the a

Returns:

true, if successful

toSet

public static <T> Set<T> toSet(T[] indexes)

Converts the array to set of same type.

Type Parameters:

T - the generic type

Parameters:

indexes - the indexes

Returns:

the set