com.gettyio.core.util

类 ObjectUtil

java.lang.Object

com.gettyio.core.util.ObjectUtil

public final class ObjectUtil
extends Object

A grab-bag of useful utility methods.

方法概要

限定符和类型	方法和说明
static <T> T[]	checkNonEmpty(T[] array, String name) Checks that the given argument is neither null nor empty.
static <T extends Collection<?>> T	checkNonEmpty(T collection, String name) Checks that the given argument is neither null nor empty.
static <T> T	checkNotNull(T arg, String text) Checks that the given argument is not null.
static int	checkPositive(int i, String name) 检查是否是正数 >0 Checks that the given argument is strictly positive.
static long	checkPositive(long i, String name) Checks that the given argument is strictly positive.
static int	checkPositiveOrZero(int i, String name) Checks that the given argument is positive or zero.
static long	checkPositiveOrZero(long i, String name) Checks that the given argument is positive or zero.
static int	intValue(Integer wrapper, int defaultValue) Resolves a possibly null Integer to a primitive int, using a default value.
static byte[]	longToByte(long i) 方法名：longToByte @param i @return 返回类型：byte[]
static long	longValue(Long wrapper, long defaultValue) Resolves a possibly null Long to a primitive long, using a default value.
static byte[]	ObjToByteArray(Object obj) 对象转数组
static byte[]	shortToByte(int i) 方法名：shortToByte @param i @return 返回类型：byte[]
static int	toInt(byte... b) 方法名：toInt @param b @return 返回类型：int
static long	toLong(byte... b) 方法名：toLong @param b @return 返回类型：long

从类继承的方法 java.lang.Object

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

方法详细资料

checkNotNull

public static <T> T checkNotNull(T arg,
                                 String text)

Checks that the given argument is not null. If it is, throws NullPointerException. Otherwise, returns the argument.

参数:

arg - arg

text - text

返回:

T t

checkPositive

public static int checkPositive(int i,
                                String name)

检查是否是正数 >0 Checks that the given argument is strictly positive. If it is not, throws IllegalArgumentException. Otherwise, returns the argument.

参数:

i - i

name - name

返回:

int

checkPositive

public static long checkPositive(long i,
                                 String name)

Checks that the given argument is strictly positive. If it is not, throws IllegalArgumentException. Otherwise, returns the argument.

参数:

i - i

name - name

返回:

long

checkPositiveOrZero

public static int checkPositiveOrZero(int i,
                                      String name)

Checks that the given argument is positive or zero. If it is not , throws IllegalArgumentException. Otherwise, returns the argument.

参数:

i - i

name - name

返回:

int

checkPositiveOrZero

public static long checkPositiveOrZero(long i,
                                       String name)

Checks that the given argument is positive or zero. If it is not, throws IllegalArgumentException. Otherwise, returns the argument.

参数:

i - i

name - name

返回:

long

checkNonEmpty

public static <T> T[] checkNonEmpty(T[] array,
                                    String name)

Checks that the given argument is neither null nor empty. If it is, throws NullPointerException or IllegalArgumentException. Otherwise, returns the argument.

参数:

name - name

array - array

返回:

T

checkNonEmpty

public static <T extends Collection<?>> T checkNonEmpty(T collection,
                                                        String name)

Checks that the given argument is neither null nor empty. If it is, throws NullPointerException or IllegalArgumentException. Otherwise, returns the argument.

参数:

name - name

collection - collection

返回:

t

intValue

public static int intValue(Integer wrapper,
                           int defaultValue)

Resolves a possibly null Integer to a primitive int, using a default value.

参数:

wrapper - the wrapper

defaultValue - the default value

返回:

the primitive value

longValue

public static long longValue(Long wrapper,
                             long defaultValue)

Resolves a possibly null Long to a primitive long, using a default value.

参数:

wrapper - the wrapper

defaultValue - the default value

返回:

the primitive value

toInt

public static int toInt(byte... b)

方法名：toInt @param b @return 返回类型：int

toLong

public static long toLong(byte... b)

方法名：toLong @param b @return 返回类型：long