Getting length of a number's bits

Question

  int g = 269;//1_0000_1101
    System.out.println( length(Integer.toBinaryString(g)));

This will print 18(why?), but I want it to print 9. How can I do that?

Where is your `length()` method? Using `Integer.toBinaryString(g).length()` will print `9`. — Rohit Jain, Mar 20 '14 at 17:04
import static oracle.jrockit.jfr.events.Bits.length; Wrong import, I guess. Thanks. — George Irimiciuc, Mar 20 '14 at 17:05
Did you see what that method does? Why are you using that, if you want length of the string? — Rohit Jain, Mar 20 '14 at 17:05

score 1 · Accepted Answer · answered Mar 20 '14 at 17:22

1

System.out.println(Integer.toBinaryString(g).length());

Would print out the length of the returned String from toBinaryString. You are measuring the length of the statement otherwise.

answered Mar 20 '14 at 17:22

Engineer2021

score 1 · Answer 2 · edited May 23 '17 at 10:26

If you use the Integer object for your whole number, the getObjectSize(Object o) method in the Instrumentation library is your guy: http://docs.oracle.com/javase/7/docs/api/java/lang/instrument/Instrumentation.html

There are a few threads on this.

Cheers!

2 Answers2