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#Java map code#

Again same like Set, some of its implementation classes maintains some order. Like Set, Map also represents an unordered collection. LinkedHashSet maintains order, TreeSet maintains ascending order. Set represents an unordered collection but some of its implementation classes maintains some order.

Use Map: If objects contains the key and value pair.ĭifference between List, Set, and Map Listĭoes not allow duplicate key but values can be duplicate.Īllow single null as key and multiple null as values.

Use List: If get operations are higher than any other operation.Use Set: If you need group of unique elements.Use of a data structure or collection is depends upon the requirement. ("Element at 2nd index: "+mySubjects.get(2)) ģ - Oracle When to use List, Set and Map in Java? Map provides O(1) for accessing time but O(n) for finding maximum element from it.Import java.util.* public class Main In this article, we learned to find max value in Java Map by using the Collections class or conventional iterative comparison method. ("maximum price is : "+ Collections.max(coursePrice.keySet())) So, we passed Map.keySet() in Collection.max() method.

#Java map code#

In that case, we need to just pass the method Map.keySet() instead of Map.values(), the code to implement for this case is given below where all the course prices are keys and course names are values. Maximum price is: 8000 What if we want to find the maximum Map key instead of values? ("maximum price is : "+ Collections.max(coursePrice.values())) This example will print the maximum price of course present on the Map. In such a case, all employees with the same name will be stored in a List, and the list will be stored as Map value field. Here, we simply passed all the values of Map using Map.values() and other stuff is automatically done by Collections class in Java. For example, we can collect a list of Employee objects to map in where employee names may be duplicate fields for some stream elements. Maximum price is: 8000 Example of finding Maximum Value in Map ("Maximum price is: "+maxPrice.getValue()) If (maxPrice = null || price.getValue().compareTo(maxPrice.getValue()) > 0) import java.util.* įor(Map.Entry price:coursePrices.entrySet()) Whenever we get a bigger value or null value we assign it to Entry and at the end simply print the value of Entry. In this program, we created a null Entry of Map type and then iterate over all the values of the map. Iterative Solution to Find Maximum Value in Map Before moving to the actual solutions let's discuss iterative solutions. In a programming world, we tackle these situations by simply finding the largest and smallest value. Now, it is very obvious to think Which course is the cheapest? Which course is expensive? import java.util.* ĭo not forget to import java.util.* package otherwise compiler will give an error. In the program given below, we created a Map that will store the price for every corresponding course in key-value format. Let's understand by a program using Map in Java.

Since it stores data in the key-value format it is necessary to decide which factor should consider for comparison.

Map in Java stores value in random locations.

Challenges To Finding Max Value In Java Map Map stores data in a key-value pair format and on top of that it stores in random locations, that's why it is hard to find Max values in Map in Java.

In this article, we will learn to sort elements of Java Map.