Frequently Asked Questions of the Underscore framework in the Java class library

In the process of using the Underscore framework in the Java library, some common problems may be encountered.Here are some common questions and corresponding Java code examples. Question 1: How to use the UNDERSCORE framework creation and operation collection? Answer: The UNDERSCORE framework provides rich functions to create and operate collection.Here are some common operation example code: 1. Create a list: List<Integer> numbers = _.range(1, 10); 2. Screening the list: List<Integer> evenNumbers = _.filter(numbers, n -> n % 2 == 0); 3. Convert the list: List<String> strings = _.map(numbers, n -> "Number: " + n); 4. Sort the list: List<Integer> sortedNumbers = _.sortBy(numbers, n -> -n); Question 2: How to use the UNDERSCORE framework for asynchronous operation? Answer: The UNDERSCORE framework provides convenient methods to handle asynchronous operations.Below is an example code that uses the UNDERSCORE framework for asynchronous operation: // asynchronous execution task _.defer(() -> { // Execute some time -consuming operations // ... // You can update the UI here and other operations }); // Pay asynchronous task in parallel List<CompletableFuture<String>> futures = _.map(numbers, n -> CompletableFuture.supplyAsync(() -> { // Execute some time -consuming operations // ... return "Result: " + n; })); // Waiting for all tasks to complete CompletableFuture<Void> allFuture = _.whenAll(futures); allFuture.join(); Question 3: How to use the UNDERSCORE framework for functional programming? Answer: The UNDERSCORE framework allows to write code in a functional form.Below is an example code that uses the UNDERSCORE framework for functional programming: // Use functional programming computing level multiplier int factorial = _.reduce(_.range(1, 6), (acc, n) -> acc * n, 1); // Use the functional programming checklist whether there are even occurrences boolean hasEvenNumber = _.some(numbers, n -> n % 2 == 0); // Use functional programming calculation list of all elements and int sum = _.reduce(numbers, (acc, n) -> acc + n, 0); The above is the answer to some common questions and the corresponding Java code examples. I hope it will help you help you use the Underscore framework.