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Boolean compareTo() method in Java with examples

  • Last Updated : 08 Oct, 2018
Geek Week

The compareTo() method of Boolean class is a built in method in Java which is used to compare the given Boolean instance with the current instance.

Syntax:

BooleanObject.compareTo(Boolean a)

Parameters: It takes a Boolean value a as parameter which is to be compared with the current instance.

Return Type: The return type of the function is int. It returns:

  • 0 if ‘a’ is equal to ‘b’,
  • a negative value if ‘a’is false and ‘b’ is true,
  • a positive value if ‘a’ is true and ‘b’ is false.

Below are programs to illustrate the compareTo() method of Boolean class:



Program 1:




// Java code to implement
// compareTo() method of Boolean class
  
class GeeksforGeeks {
  
    // Driver method
    public static void main(String[] args)
    {
  
        // Boolean object
        Boolean a = new Boolean(true);
  
        // Boolean object
        Boolean b = new Boolean(true);
  
        // compare method
        System.out.println(a + " comparing with " + b
                           + " = " + a.compareTo(b));
    }
}
Output:
true comparing with true = 0

Program 2:




// Java code to implement
// compareTo() method of Java class
  
class GeeksforGeeks {
  
    // Driver method
    public static void main(String[] args)
    {
  
        // Boolean object
        Boolean a = new Boolean(true);
  
        // Boolean object
        Boolean b = new Boolean(false);
  
        // compare method
        System.out.println(a + " comparing with " + b
                           + " = " + a.compareTo(b));
    }
}
Output:
true comparing with false = 1

Program 3:




// Java code to implement
// compareTo() method of Java class
  
class GeeksforGeeks {
  
    // Driver method
    public static void main(String[] args)
    {
  
        // Boolean object
        Boolean a = new Boolean(false);
  
        // Boolean object
        Boolean b = new Boolean(true);
  
        // compare method
        System.out.println(a + " comparing with " + b
                           + " = " + a.compareTo(b));
    }
}
Output:
false comparing with true = -1

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