String Challenge

StringChallenge.java

package cl.solojava.string.challenge.run;

import java.text.SimpleDateFormat;
import java.util.Date;

public class AppRun {

	public static final String DATE_FORMAT = "hh:mm:ss";
	
	public static String DATA_PROOF = "adfghjklqrtyueiowmasbdabsod";
	
	public static int LOOP_SIZE = 10000;

	/***
	 * This proof allow know the real performance for all type String in Java
	 * language
	 */
	public static void main(String[] args) {

		testStringInmutable();

		testStringBuilder();

		testStringBuffer();
	}

	private static void testStringBuffer() {

		printLogRun("testStringBuffer");

		timeCheckPoint();

		StringBuffer varStringBuffer = new StringBuffer();

		for (int i = 0; i < LOOP_SIZE; i++) {
			varStringBuffer.append(DATA_PROOF);
		}

		timeCheckPoint();
	}

	private static void testStringBuilder() {

		printLogRun("testStringBuilder");

		timeCheckPoint();

		StringBuilder varStringBuilder = new StringBuilder();

		for (int i = 0; i < LOOP_SIZE; i++) {
			varStringBuilder.append(DATA_PROOF);
		}

		timeCheckPoint();
	}

	private static void testStringInmutable() {

		printLogRun("testStringInmutable");

		timeCheckPoint();

		String varString = "";

		for (int i = 0; i < LOOP_SIZE; i++) {
			varString = varString + DATA_PROOF;
		}

		timeCheckPoint();
	}

	public static void timeCheckPoint() {
		long currentTime = System.currentTimeMillis();
		Date currentDate = buildDate(currentTime);
		System.out.println(dateToString(currentDate));
	}

	public static Date buildDate(long time) {
		return new Date(time);
	}

	public static String dateToString(Date dateToConvert) {
		SimpleDateFormat simpleDateFormat = new SimpleDateFormat(AppRun.DATE_FORMAT);
		return simpleDateFormat.format(dateToConvert);
	}

	public static void printLogRun(String testLog) {
		System.out.println("Running [" + testLog + "] ...");
	}

}