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public final class Boolean extends Object implements Serializable, Comparable
The Boolean class wraps a value of the primitive type
boolean
in an object. An object of type
Boolean
contains a single field whose type is
boolean
.
In addition, this class provides many methods for
converting a boolean
to a String
and a
String
to a boolean
, as well as other
constants and methods useful when dealing with a
boolean
.
Field Summary | |
---|---|
static Boolean |
FALSE
The Boolean object corresponding to the primitive
value false . |
static Boolean |
TRUE
The Boolean object corresponding to the primitive
value true . |
static Class |
TYPE
The Class object representing the primitive type boolean. |
Constructor Summary | |
---|---|
Boolean(boolean value) Allocates a Boolean object representing the
value argument.
|
|
Allocates a Boolean object representing the value
true if the string argument is not null
and is equal, ignoring case, to the string .
|
Method Summary | |
---|---|
boolean |
Returns the value of this Boolean object as a boolean primitive. |
int |
Compares this Boolean instance with another. |
boolean |
Returns true if and only if the argument is not
null and is a Boolean object that
represents the same boolean value as this object.
|
static boolean |
getBoolean(String name) Returns true if and only if the system property
named by the argument exists and is equal to the string
.
|
int |
hashCode() Returns a hash code for this Boolean object. |
static boolean |
Parses the string argument as a boolean. |
String |
toString() Returns a String object representing this Boolean's value. |
static String |
toString(boolean b) Returns a String object representing the specified boolean. |
static Boolean |
valueOf(boolean b) Returns a Boolean instance representing the specified boolean value. |
static Boolean |
Returns a Boolean with a value represented by the
specified string.
|
Methods inherited from class java.lang.Object |
---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
---|
public static final Boolean FALSE
Boolean
object corresponding to the primitive
value false
.
public static final Boolean TRUE
Boolean
object corresponding to the primitive
value true
.
public static final Class TYPE
Constructor Detail |
---|
public Boolean(boolean value)
Boolean
object representing the
value
argument.
Note: It is rarely appropriate to use this constructor. Unless a new instance is required, the static factory {@link #valueOf(boolean)} is generally a better choice. It is likely to yield significantly better space and time performance.
value
- the value of the Boolean
.public Boolean(String s)
Boolean
object representing the value
true
if the string argument is not null
and is equal, ignoring case, to the string {@code "true"}.
Otherwise, allocate a Boolean
object representing the
value false
. Examples:
{@code new Boolean("True")} produces a Boolean object
that represents true.
{@code new Boolean("yes")} produces a Boolean object
that represents false.
s
- the string to be converted to a Boolean
.Method Detail |
---|
public boolean booleanValue()
boolean
value of this object.public int compareTo(Boolean b)
b
- the Boolean instance to be comparedpublic boolean equals(Object obj)
true
if and only if the argument is not
null
and is a Boolean
object that
represents the same boolean
value as this object.
equals
in class Object
obj
- the object to compare with.true
if the Boolean objects represent the
same value; false
otherwise.public static boolean getBoolean(String name)
true
if and only if the system property
named by the argument exists and is equal to the string
{@code "true"}. (Beginning with version 1.0.2 of the
JavaTM platform, the test of
this string is case insensitive.) A system property is accessible
through getProperty
, a method defined by the
System
class.
If there is no property with the specified name, or if the specified
name is empty or null, then false
is returned.
name
- the system property name.boolean
value of the system property.public int hashCode()
hashCode
in class Object
public static boolean parseBoolean(String s)
boolean
returned represents the value true
if the string argument
is not null
and is equal, ignoring case, to the string
{@code "true"}.
Example: {@code Boolean.parseBoolean("True")} returns true.
Example: {@code Boolean.parseBoolean("yes")} returns false.
s
- the String
containing the boolean
representation to be parsedpublic String toString()
true
,
a string equal to {@code "true"} is returned. Otherwise, a
string equal to {@code "false"} is returned.
toString
in class Object
public static String toString(boolean b)
true
, then
the string {@code "true"} will be returned, otherwise the
string {@code "false"} will be returned.
b
- the boolean to be convertedboolean
public static Boolean valueOf(boolean b)
b
- a boolean value.public static Boolean valueOf(String s)
Boolean
with a value represented by the
specified string. The Boolean
returned represents a
true value if the string argument is not null
and is equal, ignoring case, to the string {@code "true"}.
s
- a string.Boolean
value represented by the string.
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