What is the output o

Question

What is the output of this program?

class Output {
public static void main(String args[]) {
Double i = new Double(257.5);
boolean x = i.isNaN();
System.out.print(x);
}
}

Options:

A . true

B . false

C . 0

D . 1

Answer: Option B

i.isNaN() method returns returns true if i is not a number and false when i is a number.

Here false is returned because i is a number i:e 257.5.
Output:
$ javac Output.java
$ java Output
false

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