ObjectUtils (mybatis-querymethods 0.1.4-RELEASE API)

java.lang.Object
- querymethods.spring.data.util.ObjectUtils

```
public abstract class ObjectUtils
extends java.lang.Object
```
Miscellaneous object utility methods.
Mainly for internal use within the framework.
Thanks to Alex Ruiz for contributing several enhancements to this class!

从以下版本开始:

19.03.2004

作者:

Juergen Hoeller, Keith Donald, Rod Johnson, Rob Harrop, Chris Beams, Sam Brannen

另请参阅:

CollectionUtils, StringUtils

构造器概要

构造器
构造器和说明

ObjectUtils()

构造器
构造器和说明
`ObjectUtils()`

方法概要

All Methods Static Methods Concrete Methods
限定符和类型	方法和说明
`static <E extends java.lang.Enum<?>> E`	`caseInsensitiveValueOf(E[] enumValues, java.lang.String constant)` Case insensitive alternative to `Enum.valueOf(Class, String)`.
`static boolean`	`containsConstant(java.lang.Enum<?>[] enumValues, java.lang.String constant)` Check whether the given array of enum constants contains a constant with the given name, ignoring case when determining a match.
`static boolean`	`containsConstant(java.lang.Enum<?>[] enumValues, java.lang.String constant, boolean caseSensitive)` Check whether the given array of enum constants contains a constant with the given name.
`static boolean`	`containsElement(java.lang.Object[] array, java.lang.Object element)` Check whether the given array contains the given element.
`static java.lang.String`	`getDisplayString(java.lang.Object obj)` Return a content-based String representation if `obj` is not `null`; otherwise returns an empty String.
`static java.lang.String`	`getIdentityHexString(java.lang.Object obj)` Return a hex String form of an object's identity hash code.
`static int`	`hashCode(boolean bool)` Return the same value as `Boolean.hashCode()`}.
`static int`	`hashCode(double dbl)` Return the same value as `Double.hashCode()`}.
`static int`	`hashCode(float flt)` Return the same value as `Float.hashCode()`}.
`static int`	`hashCode(long lng)` Return the same value as `Long.hashCode()`}.
`static java.lang.String`	`identityToString(java.lang.Object obj)` Return a String representation of an object's overall identity.
`static boolean`	`isArray(java.lang.Object obj)` Determine whether the given object is an array: either an Object array or a primitive array.
`static boolean`	`isEmpty(java.lang.Object obj)` Determine whether the given object is empty.
`static boolean`	`isEmpty(java.lang.Object[] array)` Determine whether the given array is empty: i.e.
`static java.lang.String`	`nullSafeClassName(java.lang.Object obj)` Determine the class name for the given object.
`static boolean`	`nullSafeEquals(java.lang.Object o1, java.lang.Object o2)` Determine if the given objects are equal, returning `true` if both are `null` or `false` if only one is `null`.
`static int`	`nullSafeHashCode(boolean[] array)` Return a hash code based on the contents of the specified array.
`static int`	`nullSafeHashCode(byte[] array)` Return a hash code based on the contents of the specified array.
`static int`	`nullSafeHashCode(char[] array)` Return a hash code based on the contents of the specified array.
`static int`	`nullSafeHashCode(double[] array)` Return a hash code based on the contents of the specified array.
`static int`	`nullSafeHashCode(float[] array)` Return a hash code based on the contents of the specified array.
`static int`	`nullSafeHashCode(int[] array)` Return a hash code based on the contents of the specified array.
`static int`	`nullSafeHashCode(long[] array)` Return a hash code based on the contents of the specified array.
`static int`	`nullSafeHashCode(java.lang.Object obj)` Return as hash code for the given object; typically the value of `Object#hashCode()`}.
`static int`	`nullSafeHashCode(java.lang.Object[] array)` Return a hash code based on the contents of the specified array.
`static int`	`nullSafeHashCode(short[] array)` Return a hash code based on the contents of the specified array.
`static java.lang.String`	`nullSafeToString(boolean[] array)` Return a String representation of the contents of the specified array.
`static java.lang.String`	`nullSafeToString(byte[] array)` Return a String representation of the contents of the specified array.
`static java.lang.String`	`nullSafeToString(char[] array)` Return a String representation of the contents of the specified array.
`static java.lang.String`	`nullSafeToString(double[] array)` Return a String representation of the contents of the specified array.
`static java.lang.String`	`nullSafeToString(float[] array)` Return a String representation of the contents of the specified array.
`static java.lang.String`	`nullSafeToString(int[] array)` Return a String representation of the contents of the specified array.
`static java.lang.String`	`nullSafeToString(long[] array)` Return a String representation of the contents of the specified array.
`static java.lang.String`	`nullSafeToString(java.lang.Object obj)` Return a String representation of the specified Object.
`static java.lang.String`	`nullSafeToString(java.lang.Object[] array)` Return a String representation of the contents of the specified array.
`static java.lang.String`	`nullSafeToString(short[] array)` Return a String representation of the contents of the specified array.

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
  - isArray
```
public static boolean isArray(java.lang.Object obj)
```
    Determine whether the given object is an array: either an Object array or a primitive array.
    
    参数:
    
    obj - the object to check
  - isEmpty
```
public static boolean isEmpty(java.lang.Object[] array)
```
    Determine whether the given array is empty: i.e. null or of zero length.
    
    参数:
    
    array - the array to check
    
    另请参阅:
    
    isEmpty(Object)
  - isEmpty
```
public static boolean isEmpty(java.lang.Object obj)
```
    Determine whether the given object is empty.
    This method supports the following object types.
    - Array: considered empty if its length is zero
    - CharSequence: considered empty if its length is zero
    - Collection: delegates to Collection.isEmpty()
    - Map: delegates to Map.isEmpty()
    If the given object is non-null and not one of the aforementioned supported types, this method returns false.
    参数:
    
    obj - the object to check
    
    返回:
    
    true if the object is null or empty
    
    从以下版本开始:
    
    4.2
    
    另请参阅:
    
    isEmpty(Object[]), StringUtils.hasLength(CharSequence), StringUtils.isEmpty(Object), CollectionUtils.isEmpty(java.util.Collection), CollectionUtils.isEmpty(java.util.Map)
  - containsElement
```
public static boolean containsElement(java.lang.Object[] array,
                                      java.lang.Object element)
```
    Check whether the given array contains the given element.
    
    参数:
    
    array - the array to check (may be null, in which case the return value will always be false)
    
    element - the element to check for
    
    返回:
    
    whether the element has been found in the given array
  - containsConstant
```
public static boolean containsConstant(java.lang.Enum<?>[] enumValues,
                                       java.lang.String constant)
```
    Check whether the given array of enum constants contains a constant with the given name, ignoring case when determining a match.
    
    参数:
    
    enumValues - the enum values to check, typically obtained via MyEnum.values()
    
    constant - the constant name to find (must not be null or empty string)
    
    返回:
    
    whether the constant has been found in the given array
  - containsConstant
```
public static boolean containsConstant(java.lang.Enum<?>[] enumValues,
                                       java.lang.String constant,
                                       boolean caseSensitive)
```
    Check whether the given array of enum constants contains a constant with the given name.
    
    参数:
    
    enumValues - the enum values to check, typically obtained via MyEnum.values()
    
    constant - the constant name to find (must not be null or empty string)
    
    caseSensitive - whether case is significant in determining a match
    
    返回:
    
    whether the constant has been found in the given array
  - caseInsensitiveValueOf
```
public static <E extends java.lang.Enum<?>> E caseInsensitiveValueOf(E[] enumValues,
                                                                     java.lang.String constant)
```
    Case insensitive alternative to Enum.valueOf(Class, String).
    
    类型参数:
    
    E - the concrete Enum type
    
    参数:
    
    enumValues - the array of all Enum constants in question, usually per Enum.values()
    
    constant - the constant to get the enum value of
    
    抛出:
    
    java.lang.IllegalArgumentException - if the given constant is not found in the given array of enum values. Use containsConstant(Enum[], String) as a guard to avoid this exception.
  - nullSafeEquals
```
public static boolean nullSafeEquals(java.lang.Object o1,
                                     java.lang.Object o2)
```
    Determine if the given objects are equal, returning true if both are null or false if only one is null.
    Compares arrays with Arrays.equals, performing an equality check based on the array elements rather than the array reference.
    
    参数:
    
    o1 - first Object to compare
    
    o2 - second Object to compare
    
    返回:
    
    whether the given objects are equal
    
    另请参阅:
    
    Object.equals(Object), Arrays.equals(long[], long[])
  - nullSafeHashCode
```
public static int nullSafeHashCode(java.lang.Object obj)
```
    Return as hash code for the given object; typically the value of Object#hashCode()}. If the object is an array, this method will delegate to any of the nullSafeHashCode methods for arrays in this class. If the object is null, this method returns 0.
    
    另请参阅:
    
    Object.hashCode(), nullSafeHashCode(Object[]), nullSafeHashCode(boolean[]), nullSafeHashCode(byte[]), nullSafeHashCode(char[]), nullSafeHashCode(double[]), nullSafeHashCode(float[]), nullSafeHashCode(int[]), nullSafeHashCode(long[]), nullSafeHashCode(short[])
  - nullSafeHashCode
```
public static int nullSafeHashCode(java.lang.Object[] array)
```
    Return a hash code based on the contents of the specified array. If array is null, this method returns 0.
  - nullSafeHashCode
```
public static int nullSafeHashCode(boolean[] array)
```
    Return a hash code based on the contents of the specified array. If array is null, this method returns 0.
  - nullSafeHashCode
```
public static int nullSafeHashCode(byte[] array)
```
    Return a hash code based on the contents of the specified array. If array is null, this method returns 0.
  - nullSafeHashCode
```
public static int nullSafeHashCode(char[] array)
```
    Return a hash code based on the contents of the specified array. If array is null, this method returns 0.
  - nullSafeHashCode
```
public static int nullSafeHashCode(double[] array)
```
    Return a hash code based on the contents of the specified array. If array is null, this method returns 0.
  - nullSafeHashCode
```
public static int nullSafeHashCode(float[] array)
```
    Return a hash code based on the contents of the specified array. If array is null, this method returns 0.
  - nullSafeHashCode
```
public static int nullSafeHashCode(int[] array)
```
    Return a hash code based on the contents of the specified array. If array is null, this method returns 0.
  - nullSafeHashCode
```
public static int nullSafeHashCode(long[] array)
```
    Return a hash code based on the contents of the specified array. If array is null, this method returns 0.
  - nullSafeHashCode
```
public static int nullSafeHashCode(short[] array)
```
    Return a hash code based on the contents of the specified array. If array is null, this method returns 0.
  - hashCode
```
public static int hashCode(boolean bool)
```
    Return the same value as Boolean.hashCode()}.
    
    另请参阅:
    
    Boolean.hashCode()
  - hashCode
```
public static int hashCode(double dbl)
```
    Return the same value as Double.hashCode()}.
    
    另请参阅:
    
    Double.hashCode()
  - hashCode
```
public static int hashCode(float flt)
```
    Return the same value as Float.hashCode()}.
    
    另请参阅:
    
    Float.hashCode()
  - hashCode
```
public static int hashCode(long lng)
```
    Return the same value as Long.hashCode()}.
    
    另请参阅:
    
    Long.hashCode()
  - identityToString
```
public static java.lang.String identityToString(java.lang.Object obj)
```
    Return a String representation of an object's overall identity.
    
    参数:
    
    obj - the object (may be null)
    
    返回:
    
    the object's identity as String representation, or an empty String if the object was null
  - getIdentityHexString
```
public static java.lang.String getIdentityHexString(java.lang.Object obj)
```
    Return a hex String form of an object's identity hash code.
    
    参数:
    
    obj - the object
    
    返回:
    
    the object's identity code in hex notation
  - getDisplayString
```
public static java.lang.String getDisplayString(java.lang.Object obj)
```
    Return a content-based String representation if obj is not null; otherwise returns an empty String.
    Differs from nullSafeToString(Object) in that it returns an empty String rather than "null" for a null value.
    
    参数:
    
    obj - the object to build a display String for
    
    返回:
    
    a display String representation of obj
    
    另请参阅:
    
    nullSafeToString(Object)
  - nullSafeClassName
```
public static java.lang.String nullSafeClassName(java.lang.Object obj)
```
    Determine the class name for the given object.
    Returns a "null" String if obj is null.
    
    参数:
    
    obj - the object to introspect (may be null)
    
    返回:
    
    the corresponding class name
  - nullSafeToString
```
public static java.lang.String nullSafeToString(java.lang.Object obj)
```
    Return a String representation of the specified Object.
    Builds a String representation of the contents in case of an array. Returns a "null" String if obj is null.
    
    参数:
    
    obj - the object to build a String representation for
    
    返回:
    
    a String representation of obj
  - nullSafeToString
```
public static java.lang.String nullSafeToString(java.lang.Object[] array)
```
    Return a String representation of the contents of the specified array.
    The String representation consists of a list of the array's elements, enclosed in curly braces ("{}"). Adjacent elements are separated by the characters ", " (a comma followed by a space). Returns a "null" String if array is null.
    
    参数:
    
    array - the array to build a String representation for
    
    返回:
    
    a String representation of array
  - nullSafeToString
```
public static java.lang.String nullSafeToString(boolean[] array)
```
    Return a String representation of the contents of the specified array.
    The String representation consists of a list of the array's elements, enclosed in curly braces ("{}"). Adjacent elements are separated by the characters ", " (a comma followed by a space). Returns a "null" String if array is null.
    
    参数:
    
    array - the array to build a String representation for
    
    返回:
    
    a String representation of array
  - nullSafeToString
```
public static java.lang.String nullSafeToString(byte[] array)
```
    Return a String representation of the contents of the specified array.
    The String representation consists of a list of the array's elements, enclosed in curly braces ("{}"). Adjacent elements are separated by the characters ", " (a comma followed by a space). Returns a "null" String if array is null.
    
    参数:
    
    array - the array to build a String representation for
    
    返回:
    
    a String representation of array
  - nullSafeToString
```
public static java.lang.String nullSafeToString(char[] array)
```
    Return a String representation of the contents of the specified array.
    The String representation consists of a list of the array's elements, enclosed in curly braces ("{}"). Adjacent elements are separated by the characters ", " (a comma followed by a space). Returns a "null" String if array is null.
    
    参数:
    
    array - the array to build a String representation for
    
    返回:
    
    a String representation of array
  - nullSafeToString
```
public static java.lang.String nullSafeToString(double[] array)
```
    Return a String representation of the contents of the specified array.
    The String representation consists of a list of the array's elements, enclosed in curly braces ("{}"). Adjacent elements are separated by the characters ", " (a comma followed by a space). Returns a "null" String if array is null.
    
    参数:
    
    array - the array to build a String representation for
    
    返回:
    
    a String representation of array
  - nullSafeToString
```
public static java.lang.String nullSafeToString(float[] array)
```
    Return a String representation of the contents of the specified array.
    The String representation consists of a list of the array's elements, enclosed in curly braces ("{}"). Adjacent elements are separated by the characters ", " (a comma followed by a space). Returns a "null" String if array is null.
    
    参数:
    
    array - the array to build a String representation for
    
    返回:
    
    a String representation of array
  - nullSafeToString
```
public static java.lang.String nullSafeToString(int[] array)
```
    Return a String representation of the contents of the specified array.
    The String representation consists of a list of the array's elements, enclosed in curly braces ("{}"). Adjacent elements are separated by the characters ", " (a comma followed by a space). Returns a "null" String if array is null.
    
    参数:
    
    array - the array to build a String representation for
    
    返回:
    
    a String representation of array
  - nullSafeToString
```
public static java.lang.String nullSafeToString(long[] array)
```
    Return a String representation of the contents of the specified array.
    The String representation consists of a list of the array's elements, enclosed in curly braces ("{}"). Adjacent elements are separated by the characters ", " (a comma followed by a space). Returns a "null" String if array is null.
    
    参数:
    
    array - the array to build a String representation for
    
    返回:
    
    a String representation of array
  - nullSafeToString
```
public static java.lang.String nullSafeToString(short[] array)
```
    Return a String representation of the contents of the specified array.
    The String representation consists of a list of the array's elements, enclosed in curly braces ("{}"). Adjacent elements are separated by the characters ", " (a comma followed by a space). Returns a "null" String if array is null.
    
    参数:
    
    array - the array to build a String representation for
    
    返回:
    
    a String representation of array

类 ObjectUtils

构造器概要

方法概要

从类继承的方法 java.lang.Object

构造器详细资料

ObjectUtils

方法详细资料

isArray

isEmpty

isEmpty

containsElement

containsConstant

containsConstant

caseInsensitiveValueOf

nullSafeEquals

nullSafeHashCode

nullSafeHashCode

nullSafeHashCode

nullSafeHashCode

nullSafeHashCode

nullSafeHashCode

nullSafeHashCode

nullSafeHashCode

nullSafeHashCode

nullSafeHashCode

hashCode

hashCode

hashCode

hashCode

identityToString

getIdentityHexString

getDisplayString

nullSafeClassName

nullSafeToString

nullSafeToString

nullSafeToString

nullSafeToString

nullSafeToString

nullSafeToString

nullSafeToString

nullSafeToString

nullSafeToString

nullSafeToString