How to format time in 24 hour format?

JAVA Program

import java.text.SimpleDateFormat;
import java.util.Date;
public class Main {
	public static void main(String[] args) {
		Date date = new Date();
		SimpleDateFormat sdf = new SimpleDateFormat("h");
		System.out.println("hour in h format : "+ sdf.format(date));
	}
}

Output

hour in h format : 8