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When a constant variable ends with a number, do you need to put an underscore in between the number and the rest of the variable?
I haven't found a Java naming convention for this case.
For example YELLOW3 or YELLOW_3
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I have the following statement. The map always returned "Closed". But I think this statement s -> "CLOSED" could be rewritten using a better style.
Is there any better way to represent this?
String status = myOptional.map(s -> "CLOSED").orElse("OPEN");
Just use a ternary operatory to check for its presence :
String status = myOptional.isPresent() ? "CLOSED" : "OPEN";
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If I write the following code:
int a = 5;
if (a == 1 || a == 1) {
// do something
}
Why can't the compiler point out that the second part of the if statement is unnecessary, or warn that the programmer has likely made a mistake?
The compiler does not do it. But the IDE might detect the underlying problem. For example:
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As per Java's standard we should follow CamelCase. But why String's method substring() is not in camelCase ? Is it for any specific reason or just an mistake from the initial days ?
I'd say because substring is one physical word.
camelCase is used to separate words, substring is not to be intended as Sub String but as Substring... so the convention is respected.
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Why is there no function Stream.flatMap() (without any parameters) to flatten a Stream<Stream<T>>?
It would simply be implemented as Stream.flatMap(o -> o).
In my opinion, this is by far the most common use of flatMap(Function mapper).
I would imagine because it's trivial to use
import static java.util.function.Function.identity;
...
streamOfStreams.flatMap(identity())
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Why Java 7 include feature of underscore numeric literals why not comma numeric literals?
The "," operator already has meaning, so existing code would change meaning:
// Is this 3 values or 2?
int[] values = { 123,456, 789 };