Boolean.booleanValue() method in Java

booleanValue() simply returns the boolean value of a Boolean class instance. This post will discuss the booleanValue() method of the Boolean wrapper class in detail.

• Method declaration – public boolean booleanValue()
• What does it do? It returns the boolean value represented by a Boolean class’s instance. In short, it will tell what boolean value a Boolean instance hold.
  A Boolean instance can either hold a true or a false boolean value.
• What does it return? It will return either a true or a false boolean value.

Code Example

public class Codekru {

	public static void main(String[] args) {

		Boolean b1 = Boolean.valueOf(false);

		System.out.println("value of b1: " + b1.booleanValue());
	}
}

Output –

value of b1: false

Internal Implementation of the booleanValue() method

booleanValue() method returns the variable’s value which holds the boolean primitive value for the object.

    public boolean booleanValue() {
        return value;
    }

Time complexity of the booleanValue() method

The time complexity of the booleanValue() method is O(1).

What if a null object calls the booleanValue() method?

It will throw a NullPointerException, as illustrated by the below example.

public class Codekru {

	public static void main(String[] args) {

		Boolean b1 = null;

		System.out.println("value of b1: " + b1.booleanValue());
	}
}

Output –

Exception in thread "main" java.lang.NullPointerException: Cannot invoke "java.lang.Boolean.booleanValue()" because "b1" is null

Please visit this link to learn more about the Boolean wrapper class of java and its other functions or methods.

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