Gets the difference in time formatted to be easy to read - Java java.util

Java examples for java.util:Time Format

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Description

Gets the difference in time formatted to be easy to read

Demo Code


//package com.java2s;
import java.text.DecimalFormat;

public class Main {
    public static void main(String[] argv) {
        long start = 42;
        long end = 12312342;
        System.out.println(formatTimeDifference(start, end));
    }/*from  www.java 2 s .c  om*/

    /**
     * Formatter to clean up numbers
     */
    public final static DecimalFormat NUMBER_FORMATTER_NO_DECIMALS = new DecimalFormat(
            "#,###");

    /**
     * Gets the difference in time formatted to be
     * easy to read
     *
     * @param start - nano sec start time
     * @return nano sec difference up to now formatted
     */
    public static String formatTimeDifference(long start, long end) {
        return formatNanoTime(end - start);
    }

    /**
     * Breaks nano second time long into seconds, miliseconds, microseconds, and nanosecond
     * sections making it easier to read.
     *
     * @param nano - long value of time
     * @return formatted string
     */
    public static String formatNanoTime(long nano) {
        long s = nano / 1000000000;
        long ms = (nano % 1000000000) / 1000000;
        long us = ((nano % 1000000000) % 1000000) / 1000;
        long ns = ((nano % 1000000000) % 1000000) % 1000;
        String string = "";
        string += fitIntoSpaces(s, 3) + "s  ";
        string += fitIntoSpaces(ms, 3) + "ms  ";
        string += fitIntoSpaces(us, 3) + "us  ";
        string += fitIntoSpaces(ns, 3) + "ns  ";

        return string;
    }

    /**
     * Formats a number to fit into so many spaces, and to contain ,
     *
     * @param num    - number to format
     * @param spaces - spaces to pad the front with
     * @return formatted string
     */
    public static String fitIntoSpaces(long num, int spaces) {
        return padLeft(NUMBER_FORMATTER_NO_DECIMALS.format(num), spaces);
    }

    /** Adds padding to the left of the string
     * @param s - string
     * @param n - number of spaces
     * @return
     */
    public static String padLeft(String s, int n) {
        return String.format("%1$" + n + "s", s);
    }
}

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