EvilZone

"name" is a tag HTML property, so if you change it to "name4444" then HTML will not understand it.
And it's not like a $ sign in PHP. The two cannot even be compared... HTML works in a key-value mode, meaning HTML has defined tags/keys and special words, like any normal programming language does, to which you assign values.

I'm awful in java but why are you using fileHandler.hasNext() but then you're trying to get line. Has next it's about token, not about line. Try to use hasNextLine()

And it would be great if you could describe what errors you have

If you want to stay with your int x, you would need to do this:

Code: (Java) [Select]

public static void main(String[] args) {
      int buyCost = 4321;
      int sellCost = 4252;

      int profit = 1000;

      int x = (int) (1000 * profit * (sellCost / (double) buyCost));
      profit = x / 1000;

      System.out.println(profit);
}
Otherwise you are performing an integer division of this part:
(sellCost / buyCost)
which will result in 0, because decimal places are just cut.

See the output of this:

Code: (Java) [Select]

int buyCost = 4321;
int sellCost = 4252;
int x = sellCost / buyCost;
System.out.println(x);Result: 0

This even happens if your x is of the type double, because the right part is evaluated first. So it performes an integer division and converts the 0 int to a double afterwards.

Code: (Java) [Select]

int buyCost = 4321;
int sellCost = 4252;
double x = sellCost / buyCost;
System.out.println(x);Result: 0.0

Only this works as you might expect:

Code: (Java) [Select]

int buyCost = 4321;
int sellCost = 4252;
double x = sellCost / (double) buyCost;
System.out.println(x);Result: 0.984031474195788