Remove uses of Optional.get().

LambdaLab/test/exercises/D_SimpleStreams.java

@@ -127,7 +127,7 @@ public class D_SimpleStreams {
      */
     @Test @Ignore
     public void ex10_findLongestLine() throws IOException {
-        String longest = ""; // TODO
+        String longest = null; // TODO
 
         assertEquals("Feed'st thy light's flame with self-substantial fuel,", longest);
     }

LambdaLab/test/solutions/D_SimpleStreams.java

@@ -157,12 +157,12 @@ public class D_SimpleStreams {
      */
     @Test
     public void ex10_findLongestLine() throws IOException {
-        //TODO//String longest = "";
+        //TODO//String longest = null;
         //BEGINREMOVE
         String longest =
             reader.lines()
                   .max(Comparator.comparingInt(String::length))
-                  .get();
+                  .orElse("");
             // Alternative:
             // Instead of Comparator.comparingInt(String::length), one could
             // use something like:

LambdaLab/test/solutions/F_AdvancedStreams.java

@@ -75,7 +75,7 @@ public class F_AdvancedStreams {
             reader.lines()
                   .flatMap(line -> WORD_PATTERN.splitAsStream(line))
                   .reduce((a, b) -> b)
-                  .get();
+                  .orElse("");
         //ENDREMOVE
 
         assertEquals("thee", result);

LambdaLab/test/solutions/G_Challenges.java

@@ -440,7 +440,7 @@ public class G_Challenges {
                      .max((i, j) -> Integer.compare(bounds.get(i) - bounds.get(i-1),
                                                     bounds.get(j) - bounds.get(j-1)))
                      .map(i -> input.substring(bounds.get(i-1), bounds.get(i)))
-                     .get();
+                     .orElse("");
 
         //ENDREMOVE