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:: (double colon) operator in Java 8
(17 answers)
Closed 7 years ago.
What does "::" do in this code?
Files.walk(Paths.get("res")).forEach(System.out::println);
I know that we use ':' for an enhanced for loop but I never saw 2 of them together
Double colon :: is called Method Reference.
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Simple way to repeat a string
(32 answers)
Print character multiple times [duplicate]
(5 answers)
Closed 2 years ago.
How can I print this in java?
###############
I know in python it is like this:
print("#" * 15)
This question already has answers here:
Please explain the usage of Labeled Statements
(3 answers)
Java Label usage [duplicate]
(2 answers)
"loop:" in Java code. What is this, and why does it compile?
(12 answers)
Should I avoid using Java Label Statements?
(12 answers)
Closed 4 years ago.
I've read some tutorials which using this syntax in Java, but I don't know what it's mean?
newNumber:while (1 <= 500) {
// do something
}
I don't understand what newNumber:while mean and I can't find it on oracle documentation.
newValue is label here. You can use it with break and continue statement. It becomes relevant for nesting loops when you want to jump from inside the nested loop.
This question already has answers here:
What is the ellipsis (...) for in this method signature?
(5 answers)
What do 3 dots next to a parameter type mean in Java?
(9 answers)
Closed 5 years ago.
I'm looking at the Files class in java 7, and I see this method
copy(InputStream, Path, CopyOptions...)
How do I read "CopyOptions...". What's the ... mean?
This question already has answers here:
Best way to Format a Double value to 2 Decimal places [duplicate]
(2 answers)
Closed 7 years ago.
The title says it all. Right now if I input a number like 100.50, in my program it prints as 100.5. Is there an easy way to make the program recognize the zero?
You can do this trick.
String s = String.format("%.2f", 100.50);
This question already has answers here:
Java String.split() sometimes giving blank strings
(3 answers)
Why in Java 8 split sometimes removes empty strings at start of result array?
(3 answers)
Closed 8 years ago.
I have a string like "2020". When I split it with split(""). Then i checked its length. It is giving me 5 . But it should give 4. What is the reason