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JavaTM 2 Platform Std. Ed. v1.3 |
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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". |
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| 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 a Boolean with a 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 with a value represented by the
specified String. The Boolean returned 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.toString in class Objectpublic int hashCode()
hashCode in class Objectpublic 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 Objectobj - 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.
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.System.getProperty(java.lang.String),
System.getProperty(java.lang.String, java.lang.String)
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JavaTM 2 Platform Std. Ed. v1.3 |
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