CompletableFuture in Java 8 Explained in 5 Minutes | Interview Ready

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CompletableFuture in Java 8 Explained in 5 Minutes | Interview Ready

package org.practice.basicprgms; import java.util.Arrays; import java.util.concurrent.CompletableFuture; import java.util.concurrent.ExecutionException; import java.util.stream.IntStream; public class CompletableFutureDemo { public static void main(String[] args) throws InterruptedException, ExecutionException { // 1. Count Even Numbers using supplyAsync() int[] arr = {10,15,20,25,30}; CompletableFuture<Long> future = CompletableFuture.supplyAsync(() -> Arrays.stream(arr) .filter(n -> n % 2 == 0) .count()); System.out.println("Even Numbers : "+ future.get()); // 2. Print Odd Numbers Using runAsync() CompletableFuture.runAsync(() -> IntStream.rangeClosed(11, 20) .filter(n -> n % 2 != 0) .forEach(System.out::println)); try { Thread.sleep(1000); }catch(Exception e) {} // 3. Combine Two Numbers using supplyAsync and thenCombine method CompletableFuture<Integer> f1 = CompletableFuture.supplyAsync(() -> 10); CompletableFuture<Integer> f2 = CompletableFuture.supplyAsync(() -> 20); CompletableFuture<Integer> result = f1.thenCombine(f2, Integer::sum); System.out.println("Sum of f1 and f2 = "+ result.get()); // 4. Calculate 12 Months Salary Using supplyAsync and thenApply CompletableFuture<Double> future1 = CompletableFuture.supplyAsync(() -> 50000.00) .thenApply(salary -> salary * 12); System.out.println("Annual Salary = "+ future1.get()); // 5. Calculate 1 Months Salary and Add Bonus using supplyAsync and thenAccept //CompletableFuture<Double> future2 = CompletableFuture.supplyAsync(() -> 50000.00) .thenAccept(salary -> { double finalSalary = salary + 100000; System.out.println("Salary with Bonus : "+ finalSalary); }); // 6. Calculate 12 Months Salary and Add Bonus using method chaining of supplyAsync, thenApply and thenAccept CompletableFuture.supplyAsync(() -> 50000.00) .thenApply(salary -> salary * 12) .thenApply(salary -> salary + 100000) .thenAccept(salary -> System.out.println("Annual Salary with Bonus : "+ salary)); } } output: Even Numbers : 3 11 13 15 17 19 Sum of f1 and f2 = 30 Annual Salary = 600000.0 Salary with Bonus : 150000.0 Annual Salary with Bonus : 700000.0