//How to check String ,StringBuffer and StringBuilder classes performances?

public class StringStringBufferStringBuillderPerformance {

public static void main(String[] args) {
long stime=System.currentTimeMillis();
String s1="govind";
for(int i=0;i<=10000;i++)
{
s1=s1.concat("khan");


       }
System.out.println("String takes time="+(System.currentTimeMillis()-stime)+"ms");

long sbtime=System.currentTimeMillis();
StringBuffer sb=new StringBuffer("govind");
for(int i=0;i<=10000;i++)
{
sb.append("khan");



}
System.out.println("stringBuffer takes time="+(System.currentTimeMillis()-sbtime+"ms"));

long sbiltime=System.currentTimeMillis();
StringBuilder sb1=new StringBuilder("govind");
for(int i=0;i<=10000;i++)
{
sb1.append("khan");


}
System.out.println("stringBuilder takes time="+(System.currentTimeMillis()-sbiltime+"ms"));
}

}

o/p:-

String takes time=426ms

stringBuffer takes time=7ms

stringBuilder takes time=1ms