Mani questions

• BinaryOpertor for List<Integer> to add the lists
• How to filter the age while grouping in map with list
• How do I create two different compliementary lists using same input
• Which FunctionalInterface should I use?
• Predicate in Java11 filters all elements
• If else code execution with Optional class
• Create a sorted Set while using streams
• What is the use of Map.ofEntries() instead of Map.of()

Mani answers