Boolean

java.lang.Object
- java.lang.Boolean

所有已实现的接口:

Serializable, Comparable<Boolean>
```
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.

从以下版本开始:

JDK1.0

另请参阅:

序列化表格

字段概要

字段
限定符和类型	字段	说明
`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.

构造器概要

构造器
构造器	说明
`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"`.

方法概要

所有方法静态方法实例方法具体方法
限定符和类型	方法	说明
`boolean`	`booleanValue()`	Returns the value of this `Boolean` object as a boolean primitive.
`static int`	`compare(boolean x, boolean y)`	Compares two `boolean` values.
`int`	`compareTo(Boolean b)`	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 int`	`hashCode(boolean value)`	Returns a hash code for a `boolean` value; compatible with `Boolean.hashCode()`.
`static boolean`	`logicalAnd(boolean a, boolean b)`	Returns the result of applying the logical AND operator to the specified `boolean` operands.
`static boolean`	`logicalOr(boolean a, boolean b)`	Returns the result of applying the logical OR operator to the specified `boolean` operands.
`static boolean`	`logicalXor(boolean a, boolean b)`	Returns the result of applying the logical XOR operator to the specified `boolean` operands.
`static boolean`	`parseBoolean(String s)`	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.

从类继承的方法 java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

- 字段详细资料
  - FALSE
```
public static final Boolean FALSE
```
    The Boolean object corresponding to the primitive value false.
  - TRUE
```
public static final Boolean TRUE
```
    The Boolean object corresponding to the primitive value true.
  - TYPE
```
public static final Class<Boolean> TYPE
```
    The Class object representing the primitive type boolean.
    
    从以下版本开始:
    
    JDK1.1
- 构造器详细资料
  - 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.
    
    参数:
    
    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.
    
    参数:
    
    s - the string to be converted to a Boolean.
- 方法详细资料
  - 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".
    Example: Boolean.parseBoolean("True") returns true.
    Example: Boolean.parseBoolean("yes") returns false.
    
    参数:
    
    s - the String containing the boolean representation to be parsed
    
    返回:
    
    the boolean represented by the string argument
    
    从以下版本开始:
    
    1.5
  - booleanValue
```
public boolean booleanValue()
```
    Returns the value of this Boolean object as a boolean primitive.
    
    返回:
    
    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 yield significantly better space and time performance.
    
    参数:
    
    b - a boolean value.
    
    返回:
    
    a Boolean instance representing b.
    
    从以下版本开始:
    
    1.4
  - valueOf
```
public static Boolean valueOf(String s)
```
    Returns a Boolean with a value represented by the specified string. The Boolean returned represents a true value if the string argument is not null and is equal, ignoring case, to the string "true".
    
    参数:
    
    s - a string.
    
    返回:
    
    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.
    
    参数:
    
    b - the boolean to be converted
    
    返回:
    
    the string representation of the specified boolean
    
    从以下版本开始:
    
    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.
    
    覆盖:
    
    toString 在类中 Object
    
    返回:
    
    a string representation of this object.
  - hashCode
```
public int hashCode()
```
    Returns a hash code for this Boolean object.
    
    覆盖:
    
    hashCode 在类中 Object
    
    返回:
    
    the integer 1231 if this object represents true; returns the integer 1237 if this object represents false.
    
    另请参阅:
    
    Object.equals(java.lang.Object), System.identityHashCode(java.lang.Object)
  - hashCode
```
public static int hashCode(boolean value)
```
    Returns a hash code for a boolean value; compatible with Boolean.hashCode().
    
    参数:
    
    value - the value to hash
    
    返回:
    
    a hash code value for a boolean value.
    
    从以下版本开始:
    
    1.8
  - 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.
    
    覆盖:
    
    equals 在类中 Object
    
    参数:
    
    obj - the object to compare with.
    
    返回:
    
    true if the Boolean objects represent the same value; false otherwise.
    
    另请参阅:
    
    Object.hashCode(), HashMap
  - 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.
    
    参数:
    
    name - the system property name.
    
    返回:
    
    the boolean value of the system property.
    
    抛出:
    
    SecurityException - for the same reasons as System#getProperty(String)
    
    另请参阅:
    
    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.
    
    指定者:
    
    compareTo 在接口中 Comparable<Boolean>
    
    参数:
    
    b - the Boolean instance to be compared
    
    返回:
    
    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
    
    抛出:
    
    NullPointerException - if the argument is null
    
    从以下版本开始:
    
    1.5
    
    另请参阅:
    
    Comparable
  - compare
```
public static int compare(boolean x,
                          boolean y)
```
    Compares two boolean values. The value returned is identical to what would be returned by:
```
    Boolean.valueOf(x).compareTo(Boolean.valueOf(y))
 
```
    参数:
    
    x - the first boolean to compare
    
    y - the second boolean to compare
    
    返回:
    
    the value 0 if x == y; a value less than 0 if !x && y; and a value greater than 0 if x && !y
    
    从以下版本开始:
    
    1.7
  - logicalAnd
```
public static boolean logicalAnd(boolean a,
                                 boolean b)
```
    Returns the result of applying the logical AND operator to the specified boolean operands.
    
    参数:
    
    a - the first operand
    
    b - the second operand
    
    返回:
    
    the logical AND of a and b
    
    从以下版本开始:
    
    1.8
    
    另请参阅:
    
    BinaryOperator
  - logicalOr
```
public static boolean logicalOr(boolean a,
                                boolean b)
```
    Returns the result of applying the logical OR operator to the specified boolean operands.
    
    参数:
    
    a - the first operand
    
    b - the second operand
    
    返回:
    
    the logical OR of a and b
    
    从以下版本开始:
    
    1.8
    
    另请参阅:
    
    BinaryOperator
  - logicalXor
```
public static boolean logicalXor(boolean a,
                                 boolean b)
```
    Returns the result of applying the logical XOR operator to the specified boolean operands.
    
    参数:
    
    a - the first operand
    
    b - the second operand
    
    返回:
    
    the logical XOR of a and b
    
    从以下版本开始:
    
    1.8
    
    另请参阅:
    
    BinaryOperator

类 Boolean

字段概要

构造器概要

方法概要

从类继承的方法 java.lang.Object

字段详细资料

FALSE

TRUE

TYPE

构造器详细资料

Boolean

Boolean

方法详细资料

parseBoolean

booleanValue

valueOf

valueOf

toString

toString

hashCode

hashCode

equals

getBoolean

compareTo

compare

logicalAnd

logicalOr

logicalXor