Java에서 프로그램 수행 시간 측정하기

import java.io.BufferedWriter;

import java.io.OutputStreamWriter;

public class Main {

    public static void main(String args[]) {

    BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));

         long start = System.currentTimeMillis();

// 수행 코드

            long end = System.currentTimeMillis();

            bw.write("실행 시간 : " + (end - start) /1000.0 + "초");

            

            bw.flush();

            bw.close();

        } catch (NumberFormatException e) {

            e.printStackTrace();

        } catch (IOException e) {

            e.printStackTrace();

        }

    }