java - What is the preferred way to complete this while loop for desired output? -

i have written little program takes name of email sender looking @ email address , returning letters @ character.

i have written while loop in 2 ways, 1 way primes loop , second uses nested if statement. both each other or 1 preferred method on other?

priming while loop:

public void findusername() {      scanner keyboard = new scanner(system.in);     char symbol = ' ';     system.out.println("please enter email!");     symbol = keyboard.findwithinhorizon(".", 0).charat(0);      while (symbol != '@') {         system.out.print(symbol);         symbol = keyboard.findwithinhorizon(".", 0).charat(0);     }     system.out.println(); } 

using nested if statement break if symbol == '@'

public void findusername() {      scanner keyboard = new scanner(system.in);     char symbol = ' ';     system.out.println("please enter email!");      while (symbol != '@') {         symbol = keyboard.findwithinhorizon(".", 0).charat(0);         if (symbol == '@') {             break;         }         system.out.print(symbol);     }     system.out.println(); } 

you don't need make loop, can use :

string email = "email@abd.com"; string str = email.substring(0, email.indexof("@")); 

this give email