Java.lang Boolean Class


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Introduction

The java.lang.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.

Class declaration

Following is the declaration for java.lang.Boolean class:

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

Field

Following are the fields for java.lang.Boolean class:

  • static Boolean FALSE -- This is the Boolean object corresponding to the primitive value false.

  • static Boolean TRUE -- This is the Boolean object corresponding to the primitive value true.

  • static Class<Boolean> TYPE -- This is the Class object representing the primitive type boolean.

Class constructors

S.N. Constructor & Description
1

Boolean(boolean value)

This allocates a Boolean object representing the value argument.

2

Boolean(String s)

This allocates a Boolean object representing the value true if the string argument is not null and is equal, ignoring case, to the string "true".

Class methods

S.N. Method & Description
1

boolean booleanValue()

This method returns the value of this Boolean object as a boolean primitive.

2

int compareTo(Boolean b)

This method compares this Boolean instance with another.

3

boolean equals(Object obj)

This method 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.

4

static boolean getBoolean(String name)

This method returns true if and only if the system property named by the argument exists and is equal to the string "true".

5

int hashCode()

This method returns a hash code for this Boolean object.

6

static boolean parseBoolean(String s)

This method parses the string argument as a boolean.

7

String toString()

This method returns a String object representing this Boolean's value.

8

static String toString(boolean b)

This method returns a String object representing the specified boolean.

9

static Boolean valueOf(boolean b)

This method returns a Boolean instance representing the specified boolean value.

10

static Boolean valueOf(String s)

This method returns a Boolean with a value represented by the specified string.

Methods inherited

This class inherits methods from the following classes:

  • java.lang.Object


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