在阅读下面的arrayNode时，有没有更好的方法进行深空点检查？

Question

I'm doing a null pointer check and would like to know if there is any better way in java 8 other than optional feature

if (cake != null && cake.frosting != null && cake.frosting.berries != null) {
//Do something
}

I'm looking if there is any in-line null pointer check

Answer 1

The Elvis operator is what you would want, but it's not part of the Java language. In Groovy you would simply do cake?.frosting?.berries . As you said, you could use Optional if(Optional.ofNullable(cake).map(c -> c.getFosting()).map(f -> f.getBerries()).isPresent()) but that IMHO is quite horrible and not the intended use for Optional. Your if statement, as you wrote it, is simple and easy to read.

Answer 2

Maybe something like

try{
    cake.frosting.berries.toString();
}catch(NullPointerException npe){
    return;
}
//do something