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java.lang.Object com.google.common.base.Objects
public final class Objects
Helper functions that can operate on any Object
.
Nested Class Summary | |
---|---|
static class |
Objects.ToStringHelper
Support class for toStringHelper(java.lang.Object) . |
Method Summary | |
---|---|
static boolean |
equal(Object a,
Object b)
Determines whether two possibly-null objects are equal. |
static int |
hashCode(Object... objects)
Generates a hash code for multiple values. |
static Objects.ToStringHelper |
toStringHelper(Object object)
Creates an instance of Objects.ToStringHelper . |
Methods inherited from class java.lang.Object |
---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Method Detail |
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public static boolean equal(@Nullable Object a, @Nullable Object b)
true
if a
and b
are both null.
true
if a
and b
are both non-null and they are
equal according to Object.equals(Object)
.
false
in all other situations.
This assumes that any non-null objects passed to this function conform
to the equals()
contract.
public static int hashCode(Object... objects)
Arrays.hashCode(Object[])
.
This is useful for implementing Object.hashCode()
. For example,
in an object that has three properties, x
, y
, and
z
, one could write:
public int hashCode() { return Objects.hashCode(getX(), getY(), getZ()); }Warning: When a single object is supplied, the returned hash code does not equal the hash code of that object.
public static Objects.ToStringHelper toStringHelper(Object object)
Objects.ToStringHelper
.
This is helpful for implementing Object.toString()
. For
example, in an object that contains two member variables, x
,
and y
, one could write:
public class ClassName { public String toString() { return Objects.toStringHelper(this) .add("x", x) .add("y", y) .toString(); } }Assuming the values of
x
and y
are 1 and 2,
this code snippet returns the string "ClassName{x=1, y=2}".
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