Using variables outside of an if-statement

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You can’t because of variable scope.

If you define the variable inside an if statement, than it’ll only be visible inside the scope of the if statement, which includes the statement itself plus child statements. 

if(...){
   String a = "ok";
   // a is visible inside this scope, for instance
   if(a.contains("xyz")){
      a = "foo";
   }
}

You should define the variable outside the scope and then update its value inside the if statement.

String a = "ok";
if(...){
    a = "foo";
}

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