How to convert a specific string value taken from a file and convert it into a specific integer value?

Question

After reading a file in and assigning each letter to a specific integer value, how would I then convert the read-in string into the initialized integers as seen below?

A = 20
B = 30
C = 40
D = 50

The file has the following data: B D C A C A D B

How do I then convert the letters read in from the file into the numbers? For example, if I read B in, how would I convert it into 30?

Use this: **int java.lang.Integer.parseInt(String s) throws NumberFormatException** — Imran, Oct 07 '14 at 13:07
@Makoto it seems clear to me that Imran was referring to the docs with his comment. — BackSlash, Oct 07 '14 at 13:10

score 3 · Answer 1 · answered Oct 07 '14 at 13:07

I suggest you use a Map.

Map<String, Integer> map = new HashMap<>();
map.put("A", 20);
map.put("B", 30);
map.put("C", 40);
map.put("D", 50);

The file.txt has the following data: B D C A C A D B

String item1 = inputFile.next();
Integer value1 = map.get(item1);  // turns B => 30.

How to convert a specific string value taken from a file and convert it into a specific integer value?

1 Answers1