Use final and lambda shorthand

Author: garydgregory

src/main/java/org/apache/commons/csv/CSVFormat.java

@@ -2305,7 +2305,7 @@ private void validate() throws IllegalArgumentException {
         if (headers != null && duplicateHeaderMode != DuplicateHeaderMode.ALLOW_ALL) {
             final Set<String> dupCheckSet = new HashSet<>(headers.length);
             final boolean emptyDuplicatesAllowed = duplicateHeaderMode == DuplicateHeaderMode.ALLOW_EMPTY;
-            for (String header : headers) {
+            for (final String header : headers) {
                 final boolean blank = isBlank(header);
                 // Sanitise all empty headers to the empty string "" when checking duplicates
                 final boolean containsHeader = !dupCheckSet.add(blank ? "" : header);

src/test/java/org/apache/commons/csv/CSVParserTest.java

@@ -53,6 +53,7 @@
 
 import org.apache.commons.io.input.BOMInputStream;
 import org.apache.commons.io.input.BrokenInputStream;
+import org.junit.jupiter.api.Assertions;
 import org.junit.jupiter.api.Disabled;
 import org.junit.jupiter.api.Test;
 
@@ -113,7 +114,7 @@ private BOMInputStream createBOMInputStream(final String resource) throws IOExce
     }
 
     private void parseFully(final CSVParser parser) {
-        parser.forEach(record -> assertNotNull(record));
+        parser.forEach(Assertions::assertNotNull);
     }
 
     @Test

src/test/java/org/apache/commons/csv/issues/JiraCsv288Test.java

@@ -31,8 +31,8 @@
 
 public class JiraCsv288Test {
 
-    private void print(final CSVRecord csvRecord, CSVPrinter csvPrinter) throws IOException {
-        for (String value : csvRecord) {
+    private void print(final CSVRecord csvRecord, final CSVPrinter csvPrinter) throws IOException {
+        for (final String value : csvRecord) {
             csvPrinter.print(value);
         }
     }