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JavaTM 2 Platform Standard Edition |
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SUMMARY: INNER | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |
java.lang.Object | +--java.lang.Boolean
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. |
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Boolean(String s)
Allocates a Boolean object representing the value
true if the string argument is not null
and is equal, ignoring case, to the string "true" . |
Method Summary | |
boolean |
booleanValue()
Returns the value of this Boolean object as a boolean primitive. |
boolean |
equals(Object obj)
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
"true" . |
int |
hashCode()
Returns a hash code for this Boolean object. |
String |
toString()
Returns a String object representing this Boolean's value. |
static Boolean |
valueOf(String s)
Returns the boolean value represented by the specified String. |
Methods inherited from class java.lang.Object |
clone,
finalize,
getClass,
notify,
notifyAll,
wait,
wait,
wait |
Field Detail |
public static final Boolean TRUE
Boolean
object corresponding to the primitive
value true
.public static final Boolean FALSE
Boolean
object corresponding to the primitive
value false
.public static final Class TYPE
Constructor Detail |
public Boolean(boolean value)
Boolean
object representing the
value
argument.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 "true"
.
Otherwise, allocate a Boolean
object representing the
value false
. Examples:
new Boolean("True") produces a Boolean object
that represents true.
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 static Boolean valueOf(String s)
Boolean
object is constructed. This
Boolean
represents the value true
if the
string argument is not null
and is equal, ignoring
case, to the string "true"
.
Example: Boolean.valueOf("True") returns true.
Example: Boolean.valueOf("yes") returns false.
s
- a string.Boolean
value represented by the string.public String toString()
true
, a string equal
to "true"
is returned. Otherwise, a string equal to
"false"
is returned.public int hashCode()
public 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.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
"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.name
- the system property name.boolean
value of the system property.System.getProperty(java.lang.String)
,
System.getProperty(java.lang.String, java.lang.String)
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JavaTM 2 Platform Standard Edition |
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