What is AWS S3 and what are its key features? Amazon S3 (Simple Storage Service) is a cloud-based storage service offered by Amazon Web Services (AWS) that provides scalable and highly available storage infrastructure for businesses and individuals to store and retrieve data. Some of the key features of AWS S3 include: Scalability: AWS S3… Read More »
AWS Short Questions and Answers What is AWS Lambda? AWS Lambda is a serverless computing service provided by Amazon Web Services (AWS). It allows developers to run their code without having to worry about the underlying infrastructure. What languages are supported by AWS Lambda? AWS Lambda supports multiple programming languages, including Java, Python, Node.js, C#,… Read More »
To use Java 8 streams to find all values preceding a larger value in a list or array, you can use the filter() method along with a lambda expression that checks if each element is less than the larger value, and then use the collect() method to collect the filtered elements into a new list… Read More »
To sort a Map by value using lambdas and streams in Java 8, you can create a Stream of the map entries, sort them using the Comparator.comparing() method, and then collect them back into a LinkedHashMap. Here’s an example code snippet that demonstrates this approach: Map<String, Integer> unsortedMap = new HashMap<>(); unsortedMap.put(“John”, 75); unsortedMap.put(“Mary”, 82);… Read More »
To compare two streams in Java 8, you can use the Stream.allMatch() method along with a lambda expression to define the comparison criteria. Here’s an example code snippet that demonstrates this approach: List<Integer> list1 = Arrays.asList(1, 2, 3, 4, 5); List<Integer> list2 = Arrays.asList(1, 2, 3, 4, 5); boolean isEqual = list1.stream() .allMatch(list2::contains); System.out.println(isEqual);… Read More »
To take every nth element from a Java 8 stream, you can use the IntStream.range() method to create a stream of indices, and then use the filter() method to select only the elements with indices that are multiples of n. Here’s an example code snippet that demonstrates this approach: List<Integer> list = Arrays.asList(1, 2, 3,… Read More »
To merge two Map<String, Integer> using Java 8 Stream API, you can follow these steps:Combine the key sets of both maps.Create a new Map<String, Integer> by iterating over the combined key set.For each key, check if it exists in either map, and add the corresponding values.Return the new merged map.Here’s an example code snippet that… Read More »
In Java 8, the forEach method is a default method in the Iterable interface that allows you to iterate over each element of a collection and perform an operation on each element. The forEach method takes a Consumer functional interface as an argument, which represents the operation to be performed on each element. The forEach… Read More »
To find the duplicate elements from a collection using Java 8 streams, you can use the Collectors.groupingBy method to group elements by their value, and then filter the resulting map to include only those entries with more than one value. Here’s an example: List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 2, 5, 1, 6, 7,… Read More »
To collect successive pairs from a stream API in Java, you can use the IntStream interface which provides a method called range to generate a range of integers, and the Stream interface which provides a method called iterate to generate a sequence of values based on a given function. Here’s an example: List<Integer> numbers =… Read More »