import java.text.DecimalFormat;

import java.text.NumberFormat;

public class NanoTimer {

private static final long NANOS_IN_SECONDS = 1000000000;

private long timeStart;

private long timeEnd;

public NanoTimer(){

reset();

}

public void start(){

timeStart = System.nanoTime();

}

public void stop(){

timeEnd = System.nanoTime();

}

public void reset(){

timeStart = 0;

timeEnd = 0;

}

public long getLapsed(){

return (timeEnd-timeStart);

}

public String getFormattedTimeLapsed(){

String toReturn = getLapsed() + " ns";

if(getLapsed() >= NANOS_IN_SECONDS / 1000){

DecimalFormat df = new DecimalFormat("#0.000");

double inSeconds = 1.0 * getLapsed() / NANOS_IN_SECONDS;

toReturn += " (" + df.format(inSeconds) + " sec)";

}else{

toReturn += " (< 0.001 sec)";

}

return toReturn;

}

}