java - How to write while loop condition -

the program asks password , enter it, else 3 attempts , if fail 3 times locks (in theory).

questions:

1. how should write while loop, says "line can't resolved variable" , don't know how solve this.

2. the subtraction of attempts doesn't work. how should write it?

here's code:

import java.util.scanner;  public class application {     public static void main(string[] args) {          while(line != correctpass) {              string correctpass = "java";              system.out.println("enter password");              scanner input = new scanner(system.in);             string line = input.nextline();              if(line.equals(correctpass)) {                 system.out.println("wellcome sir!");                 break;             }             else {                 int num = 3;                 system.out.println("wrong password, please try again! "  + num + " attempts left!");                 num = num - 1;                     if(num == 0) {                         system.out.println("system locked!");                         break;                     }             }         }     } } 

the variables line , correctpass declared inside loop, hence condition statement not have access variables, should declared , initialized outside loop.

it this:

public class application {     public static void main(string[] args) {         string correctpass = "java";         scanner input = new scanner(system.in);         int num = 3;          system.out.println("enter password");           string line;         while (num != 0 && !(line = input.nextline()).equals(correctpass)) {              system.out.println("wrong password, please try again! "  + num + " attempts left!");             num = num - 1;             system.out.println("enter password");         }          if (num == 0) {             system.out.println("system locked!");         } else {             system.out.println("wellcome sir!");         }     } }