public final class Boolean extends Object
| Modifier and Type | Field and Description |
|---|---|
static Boolean |
FALSE
FALSE
|
static Boolean |
TRUE
TRUE
|
static Class |
TYPE
TYPE
|
| Constructor and Description |
|---|
Boolean(boolean flag)
Boolean
|
Boolean(String s)
Boolean
|
| Modifier and Type | Method and Description |
|---|---|
boolean |
booleanValue() |
boolean |
equals(Object obj)
Compares two Objects for equality.
|
static boolean |
getBoolean(String s) |
int |
hashCode()
Returns a hash code value for the object.
|
String |
toString()
Returns a string representation of the object.
|
static Boolean |
valueOf(boolean b)
Returns a
Boolean instance representing the specified
boolean value. |
static Boolean |
valueOf(String s) |
public static final Boolean TRUE
public static final Boolean FALSE
public static final Class TYPE
public Boolean(String s)
s - ?public Boolean(boolean flag)
flag - ?public boolean booleanValue()
public boolean equals(Object obj)
Object
The equals method implements an equivalence relation:
x,
x.equals(x) should return true.
x and
y, x.equals(y) should return
true if and only if y.equals(x) returns
true.
x,
y, and z, if x.equals(y)
returns true and y.equals(z) returns
true, then x.equals(z) should return
true.
x
and y, multiple invocations of x.equals(y)
consistently return true or consistently return
false.
x, x.equals(null)
should return false.
The equals method for class Object implements the most
discriminating possible equivalence relation on objects; that is,
for any reference values x and y, this
method returns true if and only if x and
y refer to the same object (x==y has the
value true).
equals in class Objectobj - the reference object with which to compare.true if this object is the same as the obj
argument; false otherwise.hashCode(),
Hashtablepublic static boolean getBoolean(String s)
s - ?public int hashCode()
Objectjava.util.Hashtable.
The general contract of hashCode is:
hashCode method
must consistently return the same integer. This integer need not
remain consistent from one execution of an application to another
execution of the same application.
equals
method, then calling the hashCode method on each of the
two objects must produce the same integer result.
hashCode in class ObjectObject.equals(java.lang.Object),
Hashtablepublic String toString()
ObjecttoString method returns a string that
"textually represents" this object. The result should
be a concise but informative representation that is easy for a
person to read.
It is recommended that all subclasses override this method.
The toString method for class Object
returns a string consisting of the name of the class of which the
object is an instance, the at-sign character `@', and
the unsigned hexadecimal representation of the hash code of the
object.
public static Boolean valueOf(boolean b)
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.b - a boolean value.Boolean instance representing b.