Use SHOW_ALL_COMPARISON constant (and set it to 0; otherwise 0 would be a valid configuration without any output)

jplag/src/main/java/de/jplag/JPlagResult.java

@@ -61,7 +61,7 @@ public class JPlagResult {
      * @return a list of comparisons sorted descending by percentage.
      */
     public List<JPlagComparison> getComparisons(int numberOfComparisons) {
-        if (numberOfComparisons == -1) {
+        if (numberOfComparisons == JPlagOptions.SHOW_ALL_COMPARISONS) {
             return comparisons;
         }
         return comparisons.subList(0, Math.min(numberOfComparisons, comparisons.size()));

jplag/src/main/java/de/jplag/options/JPlagOptions.java

@@ -52,7 +52,7 @@ public record JPlagOptions(Language language, Integer minimumTokenMatch, List<St
     public static final ComparisonMode DEFAULT_COMPARISON_MODE = NORMAL;
     public static final float DEFAULT_SIMILARITY_THRESHOLD = 0;
     public static final int DEFAULT_SHOWN_COMPARISONS = 30;
-    public static final int SHOW_ALL_COMPARISONS = -1;
+    public static final int SHOW_ALL_COMPARISONS = 0;
     public static final SimilarityMetric DEFAULT_SIMILARITY_METRIC = SimilarityMetric.AVG;
     public static final Charset CHARSET = StandardCharsets.UTF_8;
 

jplag/src/test/java/de/jplag/special/VolumeTest.java

@@ -47,7 +47,7 @@ public class VolumeTest extends TestBase {
             return;
         }
 
-        var results = runJPlag("data", jPlagOptions -> jPlagOptions.withMaximumNumberOfComparisons(-1));
+        var results = runJPlag("data", jPlagOptions -> jPlagOptions.withMaximumNumberOfComparisons(JPlagOptions.SHOW_ALL_COMPARISONS));
 
         var csv = readCSVResults(String.format("%s/%s", this.getBasePath(), "matches_avg.csv"));