翻译自：https://tech.io/playgrounds/929/reactive-programming-with-reactor-3/Merge
Merge
Merging sequences is the operation consisting of listening for values
from several Publishers and emitting them in a single Flux.
合并序列是一种操作，包括监听来自多个发布者的值并在单个Flux中发出它们。
On this first exercise we will begin by merging elements of two Flux
as soon as they arrive. The caveat here is that values from flux1 arrive
with a delay, so in the resulting Flux we start seeing values from flux2 first.
在第一个练习中，我们将从两个Flux的元素一到达就合并开始。这里需要注意的是，
来自flux1的值会延迟到达，因此在得到的Flux中，我们首先看到来自flux2的值。
// Merge flux1 and flux2 values with interleave
Flux<User> mergeFluxWithInterleave(Flux<User> flux1, Flux<User> flux2) {
return Flux.merge(flux1, flux2);
}
But if we want to keep the order of sources, we can use the concat operator.
Concat will wait for flux1 to complete before it can subscribe to flux2,
ensuring that all the values from flux1 have been emitted, thus preserving
an order corresponding to the source.
但是如果我们想保持来源的顺序，我们可以使用concat运算符。Concat将等待flux1完成，
然后才能订阅flux2，确保flux1中的所有值都已发出，从而保持与源对应的顺序。
// Merge flux1 and flux2 values with no interleave (flux1 values and then flux2 values)
Flux<User> mergeFluxWithNoInterleave(Flux<User> flux1, Flux<User> flux2) {
return Flux.concat(flux1, flux2);
}
You can use concat with several Publisher. For example, you can get two Mono
and turn them into a same-order Flux:
您可以将concat与多个发布发布者一起使用。例如，您可以将两个Mono转换为一个 相同顺序的Flux：
// Create a Flux containing the value of mono1 then the value of mono2
Flux<User> createFluxFromMultipleMono(Mono<User> mono1, Mono<User> mono2) {
return Flux.concat(mono1, mono2);
}
