Linked Questions

I would like to find a way to take the object specific routine below and abstract it into a method that you can pass a class, list, and fieldname to get back a Map. If I could get a general pointer on ...

Possible Duplicate: Java: How to convert List to Map I have arrayList ArrayList<Product> productList = new ArrayList<Product>(); productList = getProducts(); //Fetch the result ...

I have an array which I want to convert to Map such that the first element in the array is key and second element is value and so on. I am trying something like below: Arrays.asList("Tamilnadu", "...

I have a list of integers [1,2,3,4,5] and I want to convert it into a map after applying a multiplication function (*5) like this: {1 = 5, 2 = 10, 3 = 15, 4 = 20, 5 = 25} I was able to use stream ...

I am trying to convert the list of strings to Map as below but am getting a compilation error no instance(s) of type variable(s) K, T exist so that UUID conforms to Function<? super T, ? extends K&...

I have an arraylist of Strings: ArrayList<String> list = Arrays.asList("A", "B", "C", "D"); I would like to initialize a map HashMap<String, List<Integer>> with the element of my ...

I need help in making this java code of adding value to map efficient by making use of Java streams to perform this put to map action class Pair{ String key; int value; } void addtoMap(...

So I have an array list: static List<Integer> KEYS = Arrays.asList(KEY1, KEY2, KEY3); and I need to create a HashMap<Integer, Double> whereby the keys are KEYS, and the values are ...

is there any way to convert Java List to Map in Java 8? I have a List which I want to add the contents to Map

I've below List<Map> as below List<Map<String,String>> list = {"key1":"1234"} {"key1":&...

I have class: class Employee { private Integer id; private String name; //getters/setters } Also I've an Arraylist with employees: List<Employee> employees = new Arraylist<>(); ...

im trying to find ways how i can create a Map with certain property/variable values of a object. My english is far from being perfect but i will try to go into details. Lets say we have a simple Java ...

I have a question regarding the usage of the Function.identity() method. Imagine the following code: Arrays.asList("a", "b", "c") .stream() .map(Function.identity()) // <- ...

I'm new to Java 8. I still don't know the API in depth, but I've made a small informal benchmark to compare the performance of the new Streams API vs the good old Collections. The test consists in ...

There is one class (SomeOrders), which has few fields like Id, Summary, Amount, etc... The requirement is to collect Id as key and Summary as value to a HashMap from an input List of SomeOrder ...