在 CompletableFuture 中执行不同签名的方法

Question

从下面的代码中，我想foo3在. 的方法签名无法更改。一种方法是进入，但这会破坏关注点分离。foo2foo1foo1foo3foo2

@Override

CompletableFuture<Integer> foo1(String str) {

    return CompletableFuture.supplyAsync(() -> foo2(str));

}

Integer foo2(String str) {

    return 0;

}

void foo3(String str) {

    System.out.println("Done");

}

Answer 1

假设您只想调用foo3afterfoo2并返回foo2输出，那么您可以这样做：return CompletableFuture.supplyAsync(() -> {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Integer r = foo2(str);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; foo3("testing");&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; return r;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; );

Answer 2

如果foo3call 应该是 的一部分foo1，那么这是一种方法：CompletableFuture<Integer> foo1(String str) {&nbsp; &nbsp; return CompletableFuture.supplyAsync(() -> foo2(str))&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; .thenApply(foo2Result -> {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; foo3(str);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; return foo2Result;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; );}或者如果你想调用它，在foo1调用的地方：foo1(str).thenApply(result -> {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; foo3(str);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; return result;&nbsp; &nbsp; &nbsp; &nbsp; });

Answer 3

你的意思是像foo1(str).thenRun(()&nbsp;->&nbsp;foo3(str);foo1因为你似乎对的结果不感兴趣。