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CompletableFutureThenApplyAsync.java

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import java.util.concurrent.CompletableFuture;

import java.util.concurrent.ExecutionException;

import java.util.function.Supplier;

public class CompletableFutureThenApplyAsync {

private String start() throws InterruptedException, ExecutionException {

final Supplier<String> supplier = () -> "hello";

final CompletableFuture<String> completableFuture = CompletableFuture.supplyAsync(supplier);

final CompletableFuture<String> future = completableFuture.thenApplyAsync(value -> value + " world");

return future.get();

}

public static void main(String[] args) throws InterruptedException, ExecutionException {

var result = new CompletableFutureThenApplyAsync().start();

assert result.equals("hello world");

}

}