TopBlend:
Here is the
first difference.
There are 10 differences.
is old.
is new.
java.lang
Class Boolean
java.lang.Object
java.lang.Boolean
-
All Implemented Interfaces:
-
Comparable
Serializable
,
Serializable
-
public final class
Boolean
-
extends
Object
-
implements
Serializable
,
Comparable
<
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.
-
Since:
-
JDK1.0
-
See Also:
-
Serialized Form
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
<
Boolean
|
TYPE
The Class object representing the primitive type boolean. |
Constructor Summary
|
Boolean
(boolean value)
Allocates a Boolean object representing the value argument. |
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. |
int
|
compareTo
(
Boolean
Compares this
Boolean
instance with another.
|
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. |
static boolean
|
parseBoolean
(
String
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
|
valueOf
(
String
s)
Returns a Boolean with a value represented by the specified String. |
TRUE
public static final Boolean TRUE
-
The Boolean object corresponding to the primitive value true.
FALSE
public static final Boolean FALSE
-
The Boolean object corresponding to the primitive value false.
TYPE
public static final Class< Boolean> TYPE
-
The Class object representing the primitive type boolean.
-
Since:
-
JDK1.1
Boolean
public Boolean(boolean value)
-
Allocates a Boolean object representing the value argument.
Note: It is rarely appropriate to use this constructor. Unless a
new
instance is required, the static factory
valueOf(boolean)
is generally a better choice. It is likely to yield significantly better space and time performance.
-
Parameters:
-
value - the value of the Boolean.
Boolean
public 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". 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
.
-
Parameters:
-
s - the string to be converted to a Boolean.
parseBoolean
public static boolean parseBoolean ( String s)
-
Parses the string argument as a boolean. The boolean returned represents the value true if the string argument is not null and is equal, ignoring case, to the string "true".
-
-
-
Parameters:
-
s - the String containing the boolean representation to be parsed
-
Returns:
-
the boolean represented by the string argument
-
Since:
-
1.5
booleanValue
public boolean booleanValue()
-
Returns the value of this
Boolean
object as a boolean primitive.
-
-
-
Returns:
-
the primitive boolean value of this object.
valueOf
public static Boolean valueOf(boolean b)
-
Returns a
Boolean
instance representing the specified
boolean
value. If the specified
boolean
value is
true
, this method returns
Boolean.TRUE
; if it is
false
, this method returns
Boolean.FALSE
. If a new
Boolean
instance is not required, this method should generally be used in preference to the constructor
Boolean(boolean)
, as this method is likely to to yield significantly better space and time performance.
-
-
-
Parameters:
-
b - a boolean value.
-
Returns:
-
a
Boolean
instance representing
b
.
-
Since:
-
1.4
valueOf
public static Boolean valueOf(String s)
-
Returns a 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
.
-
-
-
Parameters:
-
s - a string.
-
Returns:
-
the Boolean value represented by the string.
toString
public static String toString(boolean b)
-
Returns a
String
object representing the specified boolean. If the specified boolean is true, then the string
"true"
will be returned, otherwise the string
"false"
will be returned.
-
-
-
Parameters:
-
b - the boolean to be converted
-
Returns:
-
the string representation of the specified boolean
-
Since:
-
1.4
toString
public String toString()
-
Returns a
String
object representing this Boolean's value. If this object represents the value true, a string equal to "true" is returned. Otherwise, a string equal to "false" is returned.
-
-
Overrides:
-
toString
in class
Object
-
-
Returns:
-
a string representation of this object.
hashCode
public int hashCode()
-
Returns a hash code for this
Boolean
object.
-
-
Overrides:
-
hashCode
in class
Object
-
-
Returns:
-
the integer
1231
if this object represents
true
; returns the integer
1237
if this object represents
false
.
-
See Also:
-
Object.equals(java.lang.Object)
,
Hashtable
equals
public 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.
-
-
Overrides:
-
equals
in class
Object
-
-
Parameters:
-
obj - the object to compare with.
-
Returns:
-
true if the Boolean objects represent the same value; false otherwise.
-
See Also:
-
Object.hashCode()
,
Hashtable
getBoolean
public 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". (Beginning with version 1.0.2 of the Java
TM
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.
-
-
-
Parameters:
-
name - the system property name.
-
Returns:
-
the boolean value of the system property.
-
See Also:
-
System.getProperty(java.lang.String)
,
System.getProperty(java.lang.String, java.lang.String)
compareTo
public int compareTo ( Boolean b)
-
Compares this
Boolean
instance with another.
-
-
-
Parameters:
-
b - the
Boolean
instance to be compared
-
Returns:
-
zero if this object represents the same boolean value as the argument; a positive value if this object represents true and the argument represents false; and a negative value if this object represents false and the argument represents true
-
Throws:
-
NullPointerException
- if the argument is
null
-
Since:
-
1.5
-
See Also:
-
Comparable