net.dongliu.commons

类 ObjectUtils

java.lang.Object

net.dongliu.commons.ObjectUtils

public class ObjectUtils
extends Object

Utils methods for all object

作者:

Liu Dong <im@dongliu.net>

构造器概要

构造器

构造器和说明
ObjectUtils()

方法概要

限定符和类型	方法和说明
static <T> List<T>	nonNull(List<T> list) If list is null, return new mutable empty list; else list it's self
static <K,V> Map<K,V>	nonNull(Map<K,V> map) If map is null, return new mutable empty map; else map it's self
static <T> Set<T>	nonNull(Set<T> set) If set is null, return new mutable empty set; else set it's self
static String	nonNull(String value) If value is null, return "", else return value
static <T> T	nonNull(T value, T defaultValue) If value is null, return defaultValue; else return value
static boolean	unbox(Boolean value) Safe unbox, return false if value is null
static byte	unbox(Byte value) Safe unbox, return 0 if value is null
static char	unbox(Character value) Safe unbox, return '0' if value is null
static double	unbox(Double value) Safe unbox, return 0 if value is null
static float	unbox(Float value) Safe unbox, return 0 if value is null
static int	unbox(Integer value) Safe unbox, return 0 if value is null
static long	unbox(Long value) Safe unbox, return 0 if value is null
static short	unbox(Short value) Safe unbox, return 0 if value is null

从类继承的方法 java.lang.Object

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

构造器详细资料

ObjectUtils

public ObjectUtils()

方法详细资料

nonNull

public static <T> T nonNull(T value,
                            T defaultValue)

If value is null, return defaultValue; else return value

nonNull

public static String nonNull(String value)

If value is null, return "", else return value

nonNull

public static <T> List<T> nonNull(List<T> list)

If list is null, return new mutable empty list; else list it's self

nonNull

public static <T> Set<T> nonNull(Set<T> set)

If set is null, return new mutable empty set; else set it's self

nonNull

public static <K,V> Map<K,V> nonNull(Map<K,V> map)

If map is null, return new mutable empty map; else map it's self

unbox

public static boolean unbox(Boolean value)

Safe unbox, return false if value is null

unbox

public static char unbox(Character value)

Safe unbox, return '0' if value is null

unbox

public static byte unbox(Byte value)

Safe unbox, return 0 if value is null

unbox

public static short unbox(Short value)

Safe unbox, return 0 if value is null

unbox

public static int unbox(Integer value)

Safe unbox, return 0 if value is null

unbox

public static long unbox(Long value)

Safe unbox, return 0 if value is null

unbox

public static float unbox(Float value)

Safe unbox, return 0 if value is null

unbox

public static double unbox(Double value)

Safe unbox, return 0 if value is null