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我在玩 Spring reactor，我看不出concat和mergeoperator之间有什么区别

这是我的例子

    @Test
    public void merge() {
        Flux<String> flux1 = Flux.just("hello").doOnNext(value -> {
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        });
        Flux<String> flux2 = Flux.just("reactive").doOnNext(value -> {
            try {
                Thread.sleep(2000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        });
        Flux<String> flux3 = Flux.just("world");
        Flux.merge(flux1, flux2, flux3)
                .map(String::toUpperCase)
                .subscribe(System.out::println);
    }

    @Test
    public void concat() {
        Flux<String> flux1 = Flux.just("hello").doOnNext(value -> {
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        });
        Flux<String> …