package com.demo;

/**

* @author ManhKM on 2/14/2022

* @project Java-String

*/

public class TestPerformance {

public static void main(String[] args) {

/**

* Làm việc với String.

*/

String str ="";

long time = System.currentTimeMillis();

for (int i = 0 ; i < 100000; i++){

str+="add string ";

}

System.out.println("String: " + (System.currentTimeMillis() - time) + " ms");

/**

* Làm việc với StringBuilder:

*/

time = System.currentTimeMillis();

StringBuilder stringBuilder = new StringBuilder();

for (int i = 0 ; i < 100000; i++){

stringBuilder.append("append string");

}

System.out.println("StringBuilder 100K: "+(System.currentTimeMillis() - time) + " ms");

/**

* Làm việc với StringBuffer:

*/

time = System.currentTimeMillis();

StringBuffer stringBuffer = new StringBuffer();

for (int i = 0 ; i < 100000; i++){

stringBuffer.append("append string ");

}

System.out.println("StringBuffer 100K: "+(System.currentTimeMillis() - time) + " ms");

time = System.currentTimeMillis();

StringBuilder stringBuilder1 = new StringBuilder();

for (int i = 0 ; i < 1000000; i++){

stringBuilder1.append("append string");

}

System.out.println("StringBuilder 1M: "+(System.currentTimeMillis() - time) + " ms");

time = System.currentTimeMillis();

StringBuffer stringBuffer1 = new StringBuffer();

for (int i = 0 ; i < 1000000; i++){

stringBuffer1.append("append string ");

}

System.out.println("StringBuffer 1M: "+(System.currentTimeMillis() - time) + " ms");

/**

* String: 74492 ms

* StringBuilder 100K: 4 ms

* StringBuffer 100K: 6 ms

* StringBuilder 1M: 27 ms

* StringBuffer 1M: 27 ms

*/

}

}