Java Log and StackTrace

log method using stackTrace in Java

   A custom log() method can used to print a message with a details like which class which function
   called the log at which line number. It is useful for debugging.

  1 public class Main {
  2     public static void func() {
  3         Log.log("\"log msg\"");
  4     }
  5
  6     public static void main(String[] args) {
  7         func();
  8         Log.log("printing log in main");
  9     }
 10 }
 11
 12 class Log {
 13
 14     public static void log(String s) {
 15         StackTraceElement[] stackTrace = Thread.currentThread().getStackTrace();
 16         String className = stackTrace[2].getClassName();
 17         String caller = stackTrace[2].getMethodName();
 18         int lineNo = stackTrace[2].getLineNumber();
 19         System.out.println("[class-name : " + className + "],  [caller-function : "
 20                 + caller + "], [ line-no : "+ lineNo+ "], " + s);
 21     }
 22 }

[class-name : Main],  [caller-function : func], [ line-no : 3], “log msg”
[class-name : Main],  [caller-function : main], [ line-no : 8], printing log in main