Formatter

[Chetan Dodiya]

This q is from ExamLab

 import java.util.Formatter;
class Format1{
public static void main(String[] args){
System.out.printf("45%2$b%3$+04d",978,654,321,111);
}
}
   

why the output is"45true+321"
because second argument is not of boolean type???

[M Srilatha]

System.out.printf("45%2$b%3$+04d",978,654,321,111);

%2$b - print second argument as a boolean
second argument is 654.
whenever we use 'b' as conversion character,
If the argument arg is null, then the result is "false". If arg is a boolean or Boolean, then the result is the string returned by String.valueOf(). Otherwise, the result is "true".
As 654 is non null value, it will print true!

Refer to the java doc of Formatter class for more information!

[Chetan Dodiya]

thanks for the explanation...

[Devaka Cooray]

Hi Chetan,

As I said in the explanation for this question, I recommend you to read the Java Doc for Formatter class. That is the reason of why I didn't include a detailed-explanation for this question, in my simulator.

Cheers