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import java.util.concurrent.CompletableFuture;


//선언부
@FunctionalInterface
interface FuncB {
    public int calc(int a, int b);
}
 
@FunctionalInterface
interface FuncA {
    public int calc(int a);
}

//사용부 
FuncA F1 = (int a) -> a+1;
FuncA F2 = (int a) -> a+1;
FuncA F3 = (int a) -> a+1;
FuncB F4 = (int a,int b) -> a+b;
             
Integer input=1;
CompletableFuture<Integer> futureB
        = CompletableFuture.supplyAsync(() -> F1.calc(1) );

CompletableFuture<Integer> futureD
        = CompletableFuture.supplyAsync(() -> F3.calc(F2.calc(1))  );

CompletableFuture<Void> combinedFuture
        = CompletableFuture.allOf(futureB, futureD)
        .thenAccept( r-> {
            // 최종 연산로직을 비동기로 처리한 케이스
            Integer value1 = futureB.join();
            Integer value2 = futureD.join();
            log( String.format("async result:%d", value1+value2 ));
        });

// 최종 연산로직을 동기처리로 변환한 예
combinedFuture.get();
Integer sresult = futureB.get() + futureD.get();
log( String.format("sync result:%d",sresult) );