public class ManObjectUtil extends Object
This class is directly derived from org.apache.commons.lang.ObjectUtils and is intended to avoid dependencies on that project.
Modifier and Type | Class and Description |
---|---|
static class |
ManObjectUtil.Null
Class used as a null placeholder where
null
has another meaning. |
Modifier and Type | Field and Description |
---|---|
static ManObjectUtil.Null |
NULL
Singleton used as a
null placeholder where
null has another meaning. |
Constructor and Description |
---|
ManObjectUtil() |
Modifier and Type | Method and Description |
---|---|
static StringBuffer |
appendIdentityToString(StringBuffer buffer,
Object object)
Deprecated.
The design of this method is bad - see LANG-360. Instead, use identityToString(StringBuffer, Object).
|
static String |
arrayToString(Object array) |
static Object |
defaultIfNull(Object object,
Object defaultValue)
Returns a default value if the object passed is
null . |
static boolean |
equals(Object object1,
Object object2)
Compares two objects for equality, where either one or both
objects may be
null . |
static int |
hashCode(Object obj)
Gets the hash code of an object returning zero when the
object is
null . |
static String |
identityToString(Object object)
Gets the toString that would be produced by
Object
if a class did not override toString itself. |
static void |
identityToString(StringBuffer buffer,
Object object)
Appends the toString that would be produced by
Object
if a class did not override toString itself. |
static boolean |
isJavaReferenceArray(Object o) |
static Object |
max(Comparable c1,
Comparable c2)
Null safe comparison of Comparables.
|
static Object |
min(Comparable c1,
Comparable c2)
Null safe comparison of Comparables.
|
static String |
toString(Object obj)
Gets the
toString of an Object returning
an empty string ("") if null input. |
static String |
toString(Object obj,
String nullStr)
Gets the
toString of an Object returning
a specified text if null input. |
public static final ManObjectUtil.Null NULL
Singleton used as a null
placeholder where
null
has another meaning.
For example, in a HashMap
the
HashMap.get(Object)
method returns
null
if the Map
contains
null
or if there is no matching key. The
Null
placeholder can be used to distinguish between
these two cases.
Another example is Hashtable
, where null
cannot be stored.
This instance is Serializable.
public static Object defaultIfNull(Object object, Object defaultValue)
Returns a default value if the object passed is
null
.
ObjectUtils.defaultIfNull(null, null) = null ObjectUtils.defaultIfNull(null, "") = "" ObjectUtils.defaultIfNull(null, "zz") = "zz" ObjectUtils.defaultIfNull("abc", *) = "abc" ObjectUtils.defaultIfNull(Boolean.TRUE, *) = Boolean.TRUE
object
- the Object
to test, may be null
defaultValue
- the default value to return, may be null
object
if it is not null
, defaultValue otherwisepublic static boolean equals(Object object1, Object object2)
Compares two objects for equality, where either one or both
objects may be null
.
ObjectUtils.equals(null, null) = true ObjectUtils.equals(null, "") = false ObjectUtils.equals("", null) = false ObjectUtils.equals("", "") = true ObjectUtils.equals(Boolean.TRUE, null) = false ObjectUtils.equals(Boolean.TRUE, "true") = false ObjectUtils.equals(Boolean.TRUE, Boolean.TRUE) = true ObjectUtils.equals(Boolean.TRUE, Boolean.FALSE) = false
object1
- the first object, may be null
object2
- the second object, may be null
true
if the values of both objects are the samepublic static int hashCode(Object obj)
Gets the hash code of an object returning zero when the
object is null
.
ObjectUtils.hashCode(null) = 0 ObjectUtils.hashCode(obj) = obj.hashCode()
obj
- the object to obtain the hash code of, may be null
public static String identityToString(Object object)
Gets the toString that would be produced by Object
if a class did not override toString itself. null
will return null
.
ObjectUtils.identityToString(null) = null ObjectUtils.identityToString("") = "java.lang.String@1e23" ObjectUtils.identityToString(Boolean.TRUE) = "java.lang.Boolean@7fa"
object
- the object to create a toString for, may be
null
null
if
null
passed inpublic static boolean isJavaReferenceArray(Object o)
public static void identityToString(StringBuffer buffer, Object object)
Appends the toString that would be produced by Object
if a class did not override toString itself. null
will throw a NullPointerException for either of the two parameters.
ObjectUtils.identityToString(buf, "") = buf.append("java.lang.String@1e23" ObjectUtils.identityToString(buf, Boolean.TRUE) = buf.append("java.lang.Boolean@7fa" ObjectUtils.identityToString(buf, Boolean.TRUE) = buf.append("java.lang.Boolean@7fa")
buffer
- the buffer to append toobject
- the object to create a toString forpublic static StringBuffer appendIdentityToString(StringBuffer buffer, Object object)
Appends the toString that would be produced by Object
if a class did not override toString itself. null
will return null
.
ObjectUtils.appendIdentityToString(*, null) = null ObjectUtils.appendIdentityToString(null, "") = "java.lang.String@1e23" ObjectUtils.appendIdentityToString(null, Boolean.TRUE) = "java.lang.Boolean@7fa" ObjectUtils.appendIdentityToString(buf, Boolean.TRUE) = buf.append("java.lang.Boolean@7fa")
buffer
- the buffer to append to, may be null
object
- the object to create a toString for, may be null
null
if
null
passed inpublic static String toString(Object obj)
Gets the toString
of an Object
returning
an empty string ("") if null
input.
ObjectUtils.toString(null) = "" ObjectUtils.toString("") = "" ObjectUtils.toString("bat") = "bat" ObjectUtils.toString(Boolean.TRUE) = "true"
obj
- the Object to toString
, may be nullnull
inputString.valueOf(Object)
public static String toString(Object obj, String nullStr)
Gets the toString
of an Object
returning
a specified text if null
input.
ObjectUtils.toString(null, null) = null ObjectUtils.toString(null, "null") = "null" ObjectUtils.toString("", "null") = "" ObjectUtils.toString("bat", "null") = "bat" ObjectUtils.toString(Boolean.TRUE, "null") = "true"
obj
- the Object to toString
, may be nullnullStr
- the String to return if null
input, may be nullnull
inputString.valueOf(Object)
public static Object min(Comparable c1, Comparable c2)
c1
- the first comparable, may be nullc2
- the second comparable, may be nullpublic static Object max(Comparable c1, Comparable c2)
c1
- the first comparable, may be nullc2
- the second comparable, may be nullCopyright © 2024. All rights reserved.