Processing Large Files in Java, Variation 5
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--- ReadFileJavaApplicationBufferedReader4.java 2019-01-05 20:40:05.000000000 -0800 | |
+++ ReadFileJavaApplicationBufferedReader5.java 2019-01-05 20:40:11.000000000 -0800 | |
@@ -46,6 +46,8 @@ | |
ArrayList<String> firstNames = new ArrayList<>(); | |
var namePat = Pattern.compile(", \\s*([^, ]+)"); | |
+ char[] chars = new char[6]; | |
+ StringBuilder sb = new StringBuilder(7); | |
System.out.println("Reading file using " + Caller.getName()); | |
@@ -63,11 +65,12 @@ | |
} | |
String rawDate = array1[4].strip(); | |
- String month = rawDate.substring(4,6); | |
- String year = rawDate.substring(0,4); | |
- String formattedDate = month + "-" + year; | |
- dates.add(formattedDate); | |
- | |
+ rawDate.getChars(0, 6, chars, 0); | |
+ sb.setLength(0); | |
+ sb.append(chars, 0, 4) | |
+ .append('-') | |
+ .append(chars, 4, 2); | |
+ dates.add(sb.toString()); | |
} | |
for (int i : indexes) { |
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