Stream basics

src/main/java/io/javabrains/reactiveworkshop/Exercise1.java

@@ -7,24 +7,35 @@ public static void main(String[] args) {
         // Use StreamSources.intNumbersStream() and StreamSources.userStream()
 
         // Print all numbers in the intNumbersStream stream
-        // TODO: Write code here
+        StreamSources.intNumbersStream()
+                .forEach(number -> System.out.print(number + " "));
+        System.out.println();
 
         // Print numbers from intNumbersStream that are less than 5
-        // TODO: Write code here
+        StreamSources.intNumbersStream().filter(number -> number > 5)
+                .forEach(number -> System.out.print(number + " "));
+        System.out.println();
 
         // Print the second and third numbers in intNumbersStream that's greater than 5
-        // TODO: Write code here
-
+        StreamSources.intNumbersStream().filter(number -> number > 5)
+                .skip(1)
+                .limit(2).forEach(number -> System.out.print(number + " "));
+        System.out.println();
         //  Print the first number in intNumbersStream that's greater than 5.
         //  If nothing is found, print -1
-        // TODO: Write code here
+        Integer firstVal = StreamSources.intNumbersStream().filter(number -> number > 5)
+                .findFirst()
+                .orElse(-1);
+        System.out.println(firstVal);
 
         // Print first names of all users in userStream
-        // TODO: Write code here
-
+        StreamSources.userStream().forEach(firstName -> System.out.print(firstName.getFirstName() + " "));
+        System.out.println();
         // Print first names in userStream for users that have IDs from number stream
-        // TODO: Write code here
-
+        StreamSources.intNumbersStream()
+                .flatMap((id -> StreamSources.userStream().filter(user -> user.getId() == id)))
+                .map(user -> user.getFirstName())
+                .forEach(userName -> System.out.print(userName + " "));
     }
 
 }