You can't use the comparator on the argument, because you don't know the argument's type. You can't even check if a cast is allowed. I can only imagine two solutions, both bad: The set has to be created with a Class<T> object so that I can check if the argu...
in java. Firstly, we need to know aboutTreeMap. ATreeMapin Java is a class that implements theSortedMapinterface, which extends the Map interface. It is a collection that stores key-value pairs and organizes them based on their natural order or a custom Comparator provided during its ...
newKeySet(), which allows you to create a concurrent hash set backed by a concurrent hash map. If you remember, whenever you get keys from the map, they are returned in a
The error message you're seeing, (Caused by: java.lang.reflect.InaccessibleObjectException: Unable to make field private final java.util.Comparator java.util.TreeMap.comparator accessible: module java.base does not "opens java.util" to unnamed module @6d4a82") or java.lang.reflect.InaccessibleObj...
or Or is there any other procedure to do so ? how to get last element of hasSet i want to get last element of HashSet So there is a last() method in TreeSet so, i thought to convert set to TreeSet and apply last() method on it so that i will get last element i tried below...
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>ListtoSetCollections.sort(numbersList);//Sorting a MapTreeMap<Integer,String>treeMap=newTreeMap<>(map);unsortedeMap.entrySet().stream().sorted(Map.Entry.comparingByValue()).forEachOrdered(x->sortedMap.put(x.getKey(),x.getValue()));//Java 8 LambdaComparator<Employee>nameSorter=(a,b)-...
1. When to Use Comparator Interface JavaComparatorinterface imposes atotal orderingon the objects which may not have a desired natural ordering. For example, for aListofEmployeeobjects, the natural order may be ordered by employee’s id. But in real-life applications, we may want to sort the...
We can also use aTreeMap. One of the implementations ofSortedMapis aTreeMapwhich helps keep keys in natural order or custom order specified by the comparator provided while creatingTreeMap. This implies that the user can process entries of the HashMap in sorted order. However, the user canno...
Java Collection How to - Java Map Example Convert Sub Map