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Java - Boolean class
Java Boolean Class
The Java 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.
Boolean Class Declaration in Java
Following is the declaration for java.lang.Boolean class −
public final class Boolean extends Object implements Serializable, Comparable<Boolean>
Boolean Class Fields
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.
Boolean Class Constructors
Sr.No. | 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". |
Boolean Class Methods
Sr.No. | 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 | int hashCode(boolean value)
This method returns a hash code for a given boolean value. It is compatible with Boolean.hashCode(). |
7 | static boolean logicalAnd​(boolean a, boolean b)
This method returns the result of applying the logical AND operator to the specified boolean operands. |
8 | static boolean logicalOr(boolean a, boolean b)
This method returns the result of applying the logical OR operator to the specified boolean operands. |
9 | static boolean logicalXor(boolean a, boolean b)
This method returns the result of applying the logical XOR operator to the specified boolean operands. |
10 | static boolean parseBoolean(String s)
This method parses the string argument as a boolean. |
11 | String toString()
This method returns a String object representing this Boolean's value. |
12 | static String toString(boolean b)
This method returns a String object representing the specified boolean. |
13 | static Boolean valueOf(boolean b)
This method returns a Boolean instance representing the specified boolean value. |
14 | 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
Example of Java Boolean Class
The following example shows the usage of some important methods provided by Boolean class.
package com.tutorialspoint; public class BooleanDemo { public static void main(String[] args) { // create 2 Boolean objects b1, b2 Boolean b1, b2; // assign values to b1, b2 b1 = Boolean.valueOf(true); b2 = Boolean.valueOf(false); // create an int res int res; // compare b1 with b2 res = b1.compareTo(b2); String str1 = "Both values are equal "; String str2 = "Object value is true"; String str3 = "Argument value is true"; if( res == 0 ) { System.out.println( str1 ); } else if( res > 0 ) { System.out.println( str2 ); } else if( res < 0 ) { System.out.println( str3 ); } } }
Output
Let us compile and run the above program, this will produce the following result −
Object value is true