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1. Top results related to 8 functions of dictionary in java code list

   • List of objects to map in java 8

     Top Answer

     Answered Feb 12, 2018 · 21 votes

     yourTypes.stream() .collect(Collectors.groupingBy( ObjectA::getType, Collectors.mapping( ObjectA::getId, Collectors.toList())))

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     1/5

   • Java 8 Stream filtering value of list in a list

     Top Answer

     Answered Jan 07, 2015 · 20 votes

     You can do:

     myObjects.stream() .filter(t -> t.getType().equals(someotherType) && t.getSubTypes().stream().anyMatch(<predicate>)) .collect(Collectors.toList());-

     This will fetch all the MyObject objects which

     • meet a criteria regarding the type member.
     • contain objects in the nested List<String> that meet some other criteria, represented with <predicate>

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     2/5

   • Dictionary of ArrayLists in Java

     Top Answer

     Answered Jun 05, 2012 · 2 votes

     Instead of ArrayList grades; you'd have to use ArrayList grades = new ArrayList();

     Yet better: ArrayList<Float> grades = new ArrayList<Float>(); //or use Double or Number

     Note that unlike C or C++ creating a variable doesn't create the object as well. In C++ you could imagine your code as ArrayList* grades; i.e. you'd just create the reference/pointer here.

     Additional thoughts:

     • Dictionary studentGrades; this will be initialized to null.
     • public void main(String[] args) that's not a valid main function since it would have to be static
     • if you have a public static void main(String[] args) you can't use this since you don't have an object instance in the static context
     • You can't instantiate Dictionary since it is abstract. Use one of its subclasses, e.g. new Hashtable<String, List<Float>>(), or a map, e.g. Map<String, List<Float> dictionary = new HashMap<String, List<Float>>();
     • Note that local primitive variables are also not initialized, so this could give you an error too: boolean res; In Java only class members are initialized, local variables are not.

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     3/5

   • List all index of all characters in a string in Java 8

     Top Answer

     Answered Dec 17, 2021 · 2 votes

     A neat trick you can use is to stream the indices of the string, and then collect them by the character at that index:

     Map<Character, List<Integer>> indices = IntStream.range(0, input.length()) .boxed() .collect(Collectors.groupingBy(input::charAt));

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     4/5

   • Java 8 - How to sum all List element in a Map of Lists

     Top Answer

     Answered Feb 03, 2015 · 9 votes

     You have to be aware that you can combine Collectors. See Collectors.groupingBy(Function,Collector)

     Map<Integer, Integer> byId=risks.stream.collect( Collectors.groupingBy(Risk::getId, Collectors.summingInt(Risk::getRiskValue)));-

     You can also combine it with the first operation:

     Map<Integer, Integer> byId=results.stream().map(Risk::new).collect( Collectors.groupingBy(Risk::getId, Collectors.summingInt(Risk::getRiskValue)));

     Note that I assume that you have a method getRiskValue() in your class Risk, otherwise you have to replace Risk::getRiskValue with a lambda expression r -> r.riskValue to access the field, however, having getter methods is always recommended.

     The result maps from id to total.

     After reading your question again, I noticed that you actually want to sum up riskValue and store it within totRisk of each (?) Risk instance. This is a bit more complicated as it doesn’t fit the common usage pattern:

     Map<Integer, List<Risk>> byId=results.stream().map(Risk::new).collect( Collectors.groupingBy(Risk::getId, Collectors.collectingAndThen( Collectors.toList(), l-> { int total=l.stream().collect(Collectors.summingInt(r -> r.riskValue)); l.forEach(r->r.totRisk=total); return l; })));

     at this point we really should switch to using import static java.util.stream.Collectors.*;:

     Map<Integer, List<Risk>> byId=results.stream().map(Risk::new).collect( groupingBy(Risk::getId, collectingAndThen(toList(), l-> { int total=l.stream().collect(summingInt(r -> r.riskValue)); l.forEach(r->r.totRisk=total); return l; })));

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     5/5

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2. www.geeksforgeeks.org › functions-programmingFunctions in Programming - GeeksforGeeks

   www.geeksforgeeks.org › functions-programming

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   1 day ago · Functions in Programming enable the reuse of code by encapsulating a specific functionality. Once a function is defined, it can be called multiple times from different parts of the program, reducing redundancy and promoting efficient code maintenance. Functions can be called multiple times, reducing code duplication. C++ Java Python JavaScript.

   • Video Duration: 8 min

3. www.geeksforgeeks.org › given-sorted-dictionaryAlien Dictionary - GeeksforGeeks

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   5 days ago · Last Updated : 23 May, 2024. Given a sorted dictionary (array of words) of an alien language, find the order of characters in the language. Examples: Input: words [] = {“baa”, “abcd”, “abca”, “cab”, “cad”} Output: Order of characters is ‘b’, ‘d’, ‘a’, ‘c’.

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   3 days ago · It is used to multiply the value in the right hand to the left hand operand. a *=b is the same as. a = a*b. /=. It takes the division of the two operands and then assigns the result to the left operand. a /=b. %=. It takes the modules and assigns the remainder value at the left-hand operand. a %= b, it is same as a= a%b.

8. www.geeksforgeeks.org › videos › functions-onFunctions on Dictionaries in Python - GeeksforGeeks | Videos

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   12 hours ago · This method is useful for destructively iterating through a dictionary. dict.clear (): Remove all items from the dictionary. Example: Use pop, popitem, and clear to remove elements from a dictionary. Dictionary Views: dict.keys (): Return a view object that displays a list of all the keys in the dictionary.

9. pwskills.com › blog › basic-java-programs-for-beginnersBasic Java Programs For Beginners - pwskills.com

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   3 days ago · With just a few lines of code, beginners make their code come alive, marking the beginning of their journey into the mystical language of Java and signaling their entry into the coding cosmos. Logic Building and Problem Solving: Basic Java programs serve as a training ground for logic building, akin to navigating a maze of logical challenges ...