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public class B {

public int add()
{
return 011;
}
public static void main(String[] args)
{
B b1=new B();
//System.out.println(!new Boolean(false));
System.out.println(b1.add());
}

here output will give :9 . how it will come like this please explain me any one,

}

The int value 011 represents an octal value. In Java, any integral value that starts with 0 is assumed to be in the octal system (base-. Please go read about literal values in Java.  011 converted to the standard decimal (base-10) is 9, which is the default numerical system except otherwise specified, therefore 9 is printed.