Java: Explicit import of needed classes from stream and some improvements to comments.

Author: michaelnebel

java/ql/test/utils/model-generator/typebasedflow/p/Stream.java

@@ -2,8 +2,14 @@
 
 import java.util.*;
 import java.util.function.*;
-import java.util.stream.*;
-
+import java.util.stream.LongStream;
+import java.util.stream.IntStream;
+import java.util.stream.DoubleStream;
+import java.util.stream.Collector;
+
+/**
+ * This is a stub implementation of the Java Stream API.
+ */
 public class Stream<T> {
 
     // MaD=p;Stream;true;iterator;();;Argument[-1].Element;ReturnValue.Element;value;generated

java/ql/test/utils/model-generator/typebasedflow/p/TypeBasedComplex.java

@@ -19,6 +19,9 @@ public Integer apply(Function<T, Integer> f) {
         return null;
     }
 
+    // A method that doesn't mention `T` in its type signature.
+    // This is for testing that we don't generate a summary that involves the
+    // implicit field for `T`.
     // MaD=p;TypeBasedComplex;true;apply2;(Object,Function);;Argument[0];Argument[1].Parameter[0];value;generated
     // MaD=p;TypeBasedComplex;true;apply2;(Object,Function);;Argument[1].ReturnValue;ReturnValue;value;generated
     public <T1, T2> T2 apply2(T1 x, Function<T1, T2> f) {