To Calculate Execution time of the functions

ExecutionTimeCalc.java

import java.text.DecimalFormat;
import java.text.NumberFormat;

public class ExecutionTimeCalc {
    private static final NumberFormat formatter = new DecimalFormat("#0.00");
    private static long startTime = 0;

    public static void startTime(){
        startTime = System.currentTimeMillis();
    }

    public static void endTime(){
        long endTime = System.currentTimeMillis();
        Logger.v("Execution time is " + formatter.format((endTime - startTime) / 1000d) + " seconds");
    }
}