java-8 Archives - Page 7 of 11

Why is “final” not allowed in Java 8 interface methods?

One of the most useful features of Java 8 are the new default methods on interfaces. There are essentially two reasons (there may ...

May 11, 2022
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How do I convert a Java 8 IntStream to a List?

I’m looking at the docs for the IntStream, and I see an toArray method, but no way to go directly to a List<Integer> ...

May 10, 2022
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Difference between final and effectively final

I’m playing with lambdas in Java 8 and I came across warning local variables referenced from a lambda expression must be final or ...

May 10, 2022
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How to get milliseconds from LocalDateTime in Java 8

I am wondering if there is a way to get current milliseconds since 1-1-1970 (epoch) using the new LocalDate, LocalTime or LocalDateTime classes ...

May 9, 2022
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Break or return from Java 8 stream forEach?

When using external iteration over an Iterable we use break or return from enhanced for-each loop as: for (SomeObject obj : someObjects) { ...

May 9, 2022
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Convert java.time.LocalDate into java.util.Date type

I want to convert java.time.LocalDate into java.util.Date type. Because I want to set the date into JDateChooser. Or is there any date chooser ...

May 7, 2022
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How to negate a method reference predicate

In Java 8, you can use a method reference to filter a stream, for example: Stream<String> s = ...; long emptyStrings = s.filter(String::isEmpty).count(); ...

May 7, 2022
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How to parse/format dates with LocalDateTime? (Java 8)

Java 8 added a new java.time API for working with dates and times (JSR 310). I have date and time as string (e.g. ...

May 7, 2022
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What’s the difference between Instant and LocalDateTime?

I know that: Instant is rather a “technical” timestamp representation (nanoseconds) for computing. LocalDateTime is rather date/clock representation including time-zones for humans. Still ...

May 7, 2022
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How do I define a method which takes a lambda as a parameter in Java 8?

In Java 8, methods can be created as Lambda expressions and can be passed by reference (with a little work under the hood). ...

May 6, 2022
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