I have an loop inside loop to remove the elements from the seconde loop, and what is present in the list has to perform certain actions. I wish to optimize the iteration and comparisons, can it be done? How do I optimize my logic shown below to avoid so many lines of code Answer After minLenghtOfEntities += field.getFieldLength(); a break
Tag: lambda
Multiple filters applied to a single list in Java 8+
How can be achieved to pass a “list of filters” to a stream in Java 8, instead of applying them individually as illustrated in the following example? https://howtodoinjava.com/java8/stream-multiple-filters-example/ The purpose would be to dynamically create a list of filters, one way would be to iterate through a list of filters and apply it to the list to be filtered. Any
Call custom static functions from filter and map in Java 8 – stream
I want to call method name nameStartingWithPrefix() which is inside filter and its definition will be in Filter class. All ArrayList describes in main(), but the list is not passed as in an argument, how can I call in List of names inside Filter.nameStartingWithPrefix(). Syntax is given like: names is name of ArrayList which is inside main() Below is code
Java compiler: How can two methods with the same name and different signatures match a method call?
I have this class called Container: and the class called Token: and finally a test class for the Token class The test compiles and runs just fine in eclipse. When building on the commad line a compile error is raised: The compilation also fails when I change line 21 to one of When I change the line to one of
Using Lambda and Streams in For each and returning result
i am have been learning lambda and streams lately and have kind of been thrown into the deep end really early. I currently have an array list of books, a user types in a word and if the word equals the books author or title, the books toString(all attributes of the book nicely formatted) is called and returned. Very easy
Java 8: How to convert String to Map?
I have a Map: I converted it to a String: How to convert utilMapString to Map in Java8? Who can help me with? Answer Split the string by , to get individual map entries. Then split them by = to get the key and the value. Note: As pointed out by Andreas@ in the comments, this is not a reliable
Void is not a functional interface
I am trying to subscribe observable like : It’s working fine but if I use method reference compiler gives error “void is not a functional iterface” Any one can explain little bit deep? As per me subscriber accept consumer functional interface, which doesn’t return anything but we can print stream data like : Answer Your method reference syntax is wrong.
Switching Keys in a Map of Maps
How would you use Java 8 streams to swap keys in this map of maps? Or at least clean up this mess a little bit… Map<Type1, Map> to Map<Type2, Map<Type1, String&…
Using functional interfaces with function types in Kotlin
When calling Java code from Kotlin, there is SAM conversion so that Java code like this: Can look like this: Now, I’m working on a Kotlin project and I want to define a functional interface as an event listener: In SomeClass I have a function to set the listener: And when I create an instance of this class and try
How to get element index when using a stream to traverse a list?
I want to get index when traverse list use lambda. For example: EDIT: The checkBoxes = null; is just a placeholder but will be used properly once I start writing some code. Answer Here’s how I would do it. Run an IntStream over the indexes of the list. Then filter the indexes based on whether the corresponding checkbox is selected.