java.lang
public final class
public final class
java.lang.Boolean
| java.lang.Object | ||
| java.lang.Boolean | Serializable Comparable | |
Boolean is the wrapper for the primitive type boolean.
Summary
Constants
| Value | ||||
|---|---|---|---|---|
| Boolean | FALSE | The instance of the receiver which represents falsehood. | ||
| Boolean | TRUE | The instance of the receiver which represents truth. | ||
| Class | TYPE | The java.lang.Class that represents this class. |
Public Constructors
| Boolean(String string) | |||||
| Constructs a new instance of this class given a string. | |||||
| Boolean(boolean value) | |||||
| Constructs a new instance of this class given true or false. | |||||
Public Methods
| boolean | booleanValue() | ||||
| Answers true if the receiver represents true and false if the receiver represents false. | |||||
| int | compareTo(Boolean that) | ||||
Compares this |
|||||
| boolean | equals(Object o) | ||||
| Compares the argument to the receiver, and answers true if they represent the same object using a class specific comparison. | |||||
| static | boolean | getBoolean(String string) | |||
| Answers true if the system property described by the argument equal to "true" using case insensitive comparison, and false otherwise. | |||||
| int | hashCode() | ||||
| Answers an integer hash code for the receiver. | |||||
| static | boolean | parseBoolean(String s) | |||
Parses the string as a |
|||||
| static | String | toString(boolean value) | |||
| Converts the specified boolean to its string representation. | |||||
| String | toString() | ||||
| Answers a string containing a concise, human-readable description of the receiver. | |||||
| static | Boolean | valueOf(String string) | |||
| Answers a Boolean representing true if the argument is equal to "true" using case insensitive comparison, and a Boolean representing false otherwise. | |||||
| static | Boolean | valueOf(boolean b) | |||
| Answers Boolean.TRUE if the argument is equal to "true" using case insensitive comparison, and Boolean.FALSE representing false otherwise. | |||||
Methods inherited
from class
java.lang.Object
Methods inherited
from interface
java.lang.Comparable
Details
Constants
public static final Boolean FALSE
The instance of the receiver which represents falsehood.
public static final Boolean TRUE
The instance of the receiver which represents truth.
public static final Class TYPE
The java.lang.Class that represents this class.
Public Constructors
public Boolean(String string)
Constructs a new instance of this class given a string. If the string is
equal to "true" using a non-case sensitive comparison, the result will be
a Boolean representing true, otherwise it will be a Boolean representing
false.
Parameters
| string | The name of the desired boolean. |
|---|
public Boolean(boolean value)
Constructs a new instance of this class given true or false.
Parameters
| value | true or false. |
|---|
Public Methods
public boolean booleanValue()
Answers true if the receiver represents true and false if the receiver
represents false.
Returns
- true or false.
public int compareTo(Boolean that)
Compares this Boolean to another Boolean.
If this instance has the same value as the instance passed, then
0 is returned. If this instance is true and
the instance passed is false, then a positive value is
returned. If this instance is false and the instance
passed is true, then a negative value is returned.
Parameters
| that | The instance to compare to. |
|---|
Throws
| NullPointerException | if that is null. |
|---|
See Also
public boolean equals(Object o)
Compares the argument to the receiver, and answers true if they represent
the same object using a class specific comparison.
In this case, the argument must also be a Boolean, and the receiver and argument must represent the same boolean value (i.e. both true or both false).
Parameters
| o | the object to compare with this object |
|---|
Returns
trueif the object is the same as this objectfalseif it is different from this object
See Also
public static boolean getBoolean(String string)
Answers true if the system property described by the argument equal to
"true" using case insensitive comparison, and false otherwise.
Parameters
| string | The name of the desired boolean. |
|---|
Returns
- The boolean value.
public int hashCode()
Answers an integer hash code for the receiver. Any two objects which
answer
true when passed to equals must
answer the same value for this method.
Returns
- the receiver's hash
See Also
public static boolean parseBoolean(String s)
Parses the string as a boolean. If the string is not
null and is equal to "true", regardless
case, then true is returned, otherwise false.
Parameters
| s | The string to parse. |
|---|
Returns
- A boolean value.
public static String toString(boolean value)
Converts the specified boolean to its string representation. When the
boolean is true answer
"true", otherwise answer
"false".
Parameters
| value | the boolean |
|---|
Returns
- the boolean converted to a string
public String toString()
Answers a string containing a concise, human-readable description of the
receiver.
Returns
- a printable representation for the receiver.
public static Boolean valueOf(String string)
Answers a Boolean representing true if the argument is equal to "true"
using case insensitive comparison, and a Boolean representing false
otherwise.
Parameters
| string | The name of the desired boolean. |
|---|
Returns
- the boolean value.
public static Boolean valueOf(boolean b)
Answers Boolean.TRUE if the argument is equal to "true" using case
insensitive comparison, and Boolean.FALSE representing false otherwise.
Parameters
| b | the boolean value. |
|---|
Returns
- Boolean.TRUE or Boolean.FALSE Global true/false objects.