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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

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