make code readable (#3402)

sharding-core/sharding-core-rewrite/src/main/java/org/apache/shardingsphere/core/rewrite/feature/encrypt/token/generator/impl/EncryptInsertValuesTokenGenerator.java

@@ -103,7 +103,7 @@ public final class EncryptInsertValuesTokenGenerator extends BaseEncryptSQLToken
     private int getStartIndex(final Collection<InsertValuesSegment> segments) {
         int result = segments.iterator().next().getStartIndex();
         for (InsertValuesSegment each : segments) {
-            result = result > each.getStartIndex() ? each.getStartIndex() : result;
+            result = Math.min(result, each.getStartIndex());
         }
         return result;
     }
@@ -111,7 +111,7 @@ public final class EncryptInsertValuesTokenGenerator extends BaseEncryptSQLToken
     private int getStopIndex(final Collection<InsertValuesSegment> segments) {
         int result = segments.iterator().next().getStopIndex();
         for (InsertValuesSegment each : segments) {
-            result = result < each.getStopIndex() ? each.getStopIndex() : result;
+            result = Math.max(result, each.getStopIndex());
         }
         return result;
     }