Last active
January 7, 2019 00:06
-
-
Save stuart-marks/4b6e2a14395fc1d7d745e3fc2d1d64d5 to your computer and use it in GitHub Desktop.
Processing Large Files in Java, Variation 2
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
--- ReadFileJavaApplicationBufferedReader1.java | |
+++ ReadFileJavaApplicationBufferedReader2.java | |
@@ -29,17 +29,12 @@ | |
// get total line count | |
Instant lineCountStart = Instant.now(); | |
- int lines = 0; | |
Instant namesStart = Instant.now(); | |
ArrayList<String> names = new ArrayList<>(); | |
// get the 432nd and 43243 names | |
- ArrayList<Integer> indexes = new ArrayList<>(); | |
- | |
- indexes.add(1); | |
- indexes.add(433); | |
- indexes.add(43244); | |
+ int[] indexes = { 0, 432, 43243 }; | |
// count the number of donations by month | |
Instant donationsStart = Instant.now(); | |
@@ -53,16 +48,12 @@ | |
System.out.println("Reading file using " + Caller.getName()); | |
while ((readLine = b.readLine()) != null) { | |
- lines++; | |
// System.out.println(readLine); | |
// get all the names | |
String array1[] = readLine.split("\\|", 9); | |
String name = array1[7].strip(); | |
names.add(name); | |
- if(indexes.contains(lines)){ | |
- System.out.println("Name: " + names.get(lines - 1) + " at index: " + (lines - 1)); | |
- } | |
if(name.contains(", ")) { | |
@@ -88,11 +79,15 @@ | |
} | |
+ for (int i : indexes) { | |
+ System.out.println("Name: " + names.get(i) + " at index: " + (i)); | |
+ } | |
+ | |
Instant namesEnd = Instant.now(); | |
long timeElapsedNames = Duration.between(namesStart, namesEnd).toMillis(); | |
System.out.println("Name time: " + timeElapsedNames + "ms"); | |
- System.out.println("Total file line count: " + lines); | |
+ System.out.println("Total file line count: " + names.size()); | |
Instant lineCountEnd = Instant.now(); | |
long timeElapsedLineCount = Duration.between(lineCountStart, lineCountEnd).toMillis(); | |
System.out.println("Line count time: " + timeElapsedLineCount + "ms"); |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment