Minor update to the conversion wrappers

Change-Id: I33a784aa169829fa9fe02c1ef9fdfd3f43e3f10f
diff --git a/src/test/desugaredLibrary/conversions/DoubleSummaryStatisticsConversions.java b/src/test/desugaredLibrary/conversions/DoubleSummaryStatisticsConversions.java
index 1ad06e0..a0f6c8d 100644
--- a/src/test/desugaredLibrary/conversions/DoubleSummaryStatisticsConversions.java
+++ b/src/test/desugaredLibrary/conversions/DoubleSummaryStatisticsConversions.java
@@ -5,7 +5,6 @@
 package java.util;
 
 import java.lang.reflect.Field;
-import java.lang.reflect.Modifier;
 
 public class DoubleSummaryStatisticsConversions {
 
@@ -40,6 +39,8 @@
     JD_DOUBLE_MAX_FIELD.setAccessible(true);
   }
 
+  private DoubleSummaryStatisticsConversions() {}
+
   private static Field getField(Class<?> clazz, String name) {
     try {
       return clazz.getDeclaredField(name);
diff --git a/src/test/desugaredLibrary/conversions/IntSummaryStatisticsConversions.java b/src/test/desugaredLibrary/conversions/IntSummaryStatisticsConversions.java
index 8351704..8e9b616 100644
--- a/src/test/desugaredLibrary/conversions/IntSummaryStatisticsConversions.java
+++ b/src/test/desugaredLibrary/conversions/IntSummaryStatisticsConversions.java
@@ -40,6 +40,8 @@
     JD_INT_MAX_FIELD.setAccessible(true);
   }
 
+  private IntSummaryStatisticsConversions() {}
+
   private static Field getField(Class<?> clazz, String name) {
     try {
       return clazz.getDeclaredField(name);
diff --git a/src/test/desugaredLibrary/conversions/LongSummaryStatisticsConversions.java b/src/test/desugaredLibrary/conversions/LongSummaryStatisticsConversions.java
index 7096a2a..ae21eb2 100644
--- a/src/test/desugaredLibrary/conversions/LongSummaryStatisticsConversions.java
+++ b/src/test/desugaredLibrary/conversions/LongSummaryStatisticsConversions.java
@@ -40,6 +40,8 @@
     JD_LONG_MAX_FIELD.setAccessible(true);
   }
 
+  private LongSummaryStatisticsConversions() {}
+
   private static Field getField(Class<?> clazz, String name) {
     try {
       return clazz.getDeclaredField(name);
diff --git a/src/test/desugaredLibrary/conversions/OptionalConversions.java b/src/test/desugaredLibrary/conversions/OptionalConversions.java
index 390b123..908f9bf 100644
--- a/src/test/desugaredLibrary/conversions/OptionalConversions.java
+++ b/src/test/desugaredLibrary/conversions/OptionalConversions.java
@@ -6,7 +6,9 @@
 
 public class OptionalConversions {
 
-  public static j$.util.Optional convert(java.util.Optional optional) {
+  private OptionalConversions() {}
+
+  public static <T> j$.util.Optional<T> convert(java.util.Optional<T> optional) {
     if (optional == null) {
       return null;
     }
@@ -16,7 +18,7 @@
     return j$.util.Optional.empty();
   }
 
-  public static java.util.Optional convert(j$.util.Optional optional) {
+  public static <T> java.util.Optional<T> convert(j$.util.Optional<T> optional) {
     if (optional == null) {
       return null;
     }
diff --git a/src/test/desugaredLibrary/conversions/TimeConversions.java b/src/test/desugaredLibrary/conversions/TimeConversions.java
index b5adf3c..1320546 100644
--- a/src/test/desugaredLibrary/conversions/TimeConversions.java
+++ b/src/test/desugaredLibrary/conversions/TimeConversions.java
@@ -6,6 +6,8 @@
 
 public class TimeConversions {
 
+  private TimeConversions() {}
+
   public static j$.time.ZonedDateTime convert(java.time.ZonedDateTime dateTime) {
     if (dateTime == null) {
       return null;