Int2String speed

Import java. util. *; import java. io. *; import java. SQL. *; import java. text. *; import java. util. regex. *; public class Test {public static void main (String [] args) throws Exception {long starttime = System. currentTimeMillis (); String s = ""; boolean flag = true; // in a changed environment
// In a constant environment, use the following method for the fastest speed (int I = 0; I <999999; I ++) {if (flag) {s = I + "" ;}else {s = 9 + "" ;}} System. out. println (System. currentTimeMillis ()-starttime );
// In a changed environment, use the following method for the fastest speed: starttime = System. currentTimeMillis (); for (int I = 0; I <999999; I ++) {if (flag) {s = Integer. toString (I);} else {s = Integer. toString (9) ;}} System. out. println (System. currentTimeMillis ()-starttime); // This method seems redundant starttime = System. currentTimeMillis (); for (int I = 0; I <999999; I ++) {if (flag) {s = String. valueOf (I);} else {s = String. valueOf (9) ;}} System. out. println (System. currentTimeMillis ()-starttime );
// In whatever circumstances, the speed and efficiency are the worst starttime = System. currentTimeMillis (); for (int I = 0; I <999999; I ++) {if (flag) {s = new Integer (I ). toString ();} else {s = new Integer (9 ). toString () ;}} System. out. println (System. currentTimeMillis ()-starttime );}};