Default value of boolean

Question

The docs state that boolean's default value is false http://bit.ly/2r0LA7y. Still if I try to use an uninitialized boolean variable, I get an error https://code.sololearn.com/cI8Y2SAIyifB/#java

Seems like I'm missing something very simple. But what?

Answer 1

@Dayve thanks man!

In other words, the answer is that local variables are not initialized in Java. Quote from the docs:

> Local variables are slightly different; the compiler never assigns a default value to an uninitialized local variable. If you cannot initialize your local variable where it is declared, make sure to assign it a value before you attempt to use it. Accessing an uninitialized local variable will result in a compile-time error

Answer 2

Actually, you have to declare the Boolean variable(data-type) as static. This is because it is a primitive type :

public class Program
{
static boolean b;
public static void main(String[] args) {
System.out.print(false); // prints "false"
System.out.print(b); // prints "false"
}
}

For more info :
https://stackoverflow.com/questions/21950820/is-a-boolean-instance-variable-default-value-true-or-false

Answer 3

@Ivan
You're always welcome ^_^
and that's right...