IT. Expert System.

All Implemented Interfaces:

Serializable, Comparable<Boolean>

public final class Boolean
extends Object
implements Serializable, Comparable<Boolean>

Since:

1.0

See Also:

Serialized Form

• Field Summary

  Fields

  Modifier and Type	Field and Description
  static Boolean	FALSE The Boolean object that represents the primitive value false.
  static Boolean	TRUE The Boolean object that represents the primitive value true.
  static Class<Boolean>	TYPE The Class object that represents the primitive type boolean.

• Constructor Summary

  Constructors

  Constructor and Description
  Boolean(boolean value) Constructs a new Boolean with the specified primitive boolean value.
  Boolean(String string) Constructs a new Boolean with its boolean value specified by string.

• Method Summary

  Methods

  Modifier and Type	Method and Description
  boolean	booleanValue() Gets the primitive value of this boolean, either true or false.
  static int	compare(boolean lhs, boolean rhs) Compares two boolean values.
  int	compareTo(Boolean that) Compares this object to the specified boolean object to determine their relative order.
  boolean	equals(Object o) Compares this instance with the specified object and indicates if they are equal.
  static boolean	getBoolean(String string) Returns the boolean value of the system property identified by string.
  int	hashCode() Returns an integer hash code for this boolean.
  static boolean	parseBoolean(String s) Parses the specified string as a boolean.
  String	toString() Returns a string containing a concise, human-readable description of this boolean.
  static String	toString(boolean value) Converts the specified boolean to its string representation.
  static Boolean	valueOf(boolean b) Returns a Boolean instance for the specified boolean value.
  static Boolean	valueOf(String string) Parses the specified string as a boolean value.

  • Methods inherited from class java.lang.Object

    clone, finalize, getClass, notify, notifyAll, wait, wait, wait

• Field Detail

  • TYPE

    public static final Class<Boolean> TYPE

    The Class object that represents the primitive type boolean.

  • TRUE

    public static final Boolean TRUE

    The Boolean object that represents the primitive value true.

  • FALSE

    public static final Boolean FALSE

    The Boolean object that represents the primitive value false.

• Constructor Detail

  • Boolean

    public Boolean(String string)

    Constructs a new Boolean with its boolean value specified by string. If string is not null and is equal to "true" using a non-case sensitive comparison, the result will be a Boolean representing the primitive value true, otherwise it will be a Boolean representing the primitive value false.

    Parameters:

    string - the string representing a boolean value.

  • Boolean

    public Boolean(boolean value)

    Constructs a new Boolean with the specified primitive boolean value.

    Parameters:

    value - the primitive boolean value, true or false.

• Method Detail

  • booleanValue

    public boolean booleanValue()

    Gets the primitive value of this boolean, either true or false.

    Returns:

    this object's primitive value, true or false.

  • equals

    public boolean equals(Object o)

    Compares this instance with the specified object and indicates if they are equal. In order to be equal, o must be an instance of Boolean and have the same boolean value as this object.

    Overrides:

    equals in class Object

    Parameters:

    o - the object to compare this boolean with.

    Returns:

    true if the specified object is equal to this Boolean; false otherwise.

    See Also:

    Object.hashCode()

  • compareTo

    public int compareTo(Boolean that)

    Compares this object to the specified boolean object to determine their relative order.

    Specified by:

    compareTo in interface Comparable<Boolean>

    Parameters:

    that - the boolean object to compare this object to.

    Returns:

    0 if the value of this boolean and the value of that are equal; a positive value if the value of this boolean is true and the value of that is false; a negative value if the value if this boolean is false and the value of that is true.

    Since:

    1.5

    See Also:

    Comparable

  • compare

    public static int compare(boolean lhs,
              boolean rhs)

    Compares two boolean values.

    Returns:

    0 if lhs = rhs, less than 0 if lhs < rhs, and greater than 0 if lhs > rhs. (Where true > false.)

    Since:

    1.7

  • hashCode

    public int hashCode()

    Returns an integer hash code for this boolean.

    Overrides:

    hashCode in class Object

    Returns:

    this boolean's hash code, which is 1231 for true values and 1237 for false values.

    See Also:

    Object.equals(java.lang.Object)

  • toString

    public String toString()

    Returns a string containing a concise, human-readable description of this boolean.

    Overrides:

    toString in class Object

    Returns:

    "true" if the value of this boolean is true, "false" otherwise.

  • getBoolean

    public static boolean getBoolean(String string)

    Returns the boolean value of the system property identified by string.

    Parameters:

    string - the name of the requested system property.

    Returns:

    true if the system property named by string exists and it is equal to "true" using case insensitive comparison, false otherwise.

    See Also:

    System.getProperty(String)

  • parseBoolean

    public static boolean parseBoolean(String s)

    Parses the specified string as a boolean.

    Parameters:

    s - the string representation of a boolean value.

    Returns:

    true if s is not null and is equal to "true" using case insensitive comparison, false otherwise.

    Since:

    1.5

  • toString

    public static String toString(boolean value)

    Converts the specified boolean to its string representation.

    Parameters:

    value - the boolean to convert.

    Returns:

    "true" if value is true, "false" otherwise.

  • valueOf

    public static Boolean valueOf(String string)

    Parses the specified string as a boolean value.

    Parameters:

    string - the string representation of a boolean value.

    Returns:

    Boolean.TRUE if string is equal to "true" using case insensitive comparison, Boolean.FALSE otherwise.

    See Also:

    parseBoolean(String)

  • valueOf

    public static Boolean valueOf(boolean b)

    Returns a Boolean instance for the specified boolean value.

    If it is not necessary to get a new Boolean instance, it is recommended to use this method instead of the constructor, since it returns its static instances, which results in better performance.

    Parameters:

    b - the boolean to convert to a Boolean.

    Returns:

    Boolean.TRUE if b is equal to true, Boolean.FALSE otherwise.