java get line number and file name

java get line number  and file name

public class LineNo {
 public static int getLineNumber() {
 return Thread.currentThread().getStackTrace()[2].getLineNumber();
 }  
 
 public static String getFileName() {
 return Thread.currentThread().getStackTrace()[2].getFileName();
 }
 public static void main(String args[]) {
 System.out.println("["+getFileName()+"："+ getLineNumber()+"]"+"Hello World!");
 }
}

from : http://coolshell.cn/articles/611.html