long value with 0 on left

Question

Why this behavior happens?

long value = 123450;
System.out.println(\"value: \" + value); 

value: 123450

 

long         


        

Answer 1

This feature dates back to the early 'C' days. A leading '0' is for octal, a leading '0x' is for hexidecimal. It has been proposed that '0b' be for binary numbers for JDK 7.

You can parse such a number with Integer.decode(String) which also accepts a leading '#' as a hexi-decimal number.