Generate All Combinations Of Key Value Pairs Java

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Generate All Combinations Of Key Value Pairs Java Rating: 4,3/5 9714 votes

Greenhorn

Javascript Key Value Pairs

How to generate unique combinations in Excel? Supposing you have three lists, and now you want to generate unique combinations from these three lists as below screenshots shown, and how can you quickly solve this troublesome problem in Excel? Then in the List All Combinations dialog, select Value from Type drop down list. Jun 06, 2018 Pairs provide a convenient way of handling simple key to value association and are particularly useful when we want to return two values from a method. A simple implementation of a Pair is available in the core Java libraries. Beyond that, certain third-party libraries such as Apache Commons and Vavr have exposed this functionality in their. Photoshop cs5 key generator download.

I'm trying to create a HashMap, loop through that HashMap, and finally, I'm trying create an ArrayList of key/value pairs - from the HashMap - that contain within its value set a parameter value. I realize that might be a little hard to understand, so I've provided my code to.
Feb 04, 2019 Learn how we can create all possible combinations of values in two lists - using formulas in Excel. Ask Your Excel Question #16 For an excel template that.

posted 8 years ago

I'm trying to create a HashMap, loop through that HashMap, and finally, I'm trying create an ArrayList of key/value pairs -- from the HashMap -- that contain within its value set a parameter value. I realize that might be a little hard to understand, so I've provided my code to make sense of what I'm trying to accomplish.

package data; import java.util.ArrayList; import java.util.HashMap; import java.util.Iterator; import java.util.Map; public class ProductInventory { private Map <String, ArrayList<String>> product; private ArrayList <String> buildProduct; private ArrayList <ArrayList<String>> addProduct; public ProductInventory() { /** Set default values **/ product = new <String, ArrayList<String>> HashMap(); buildProduct = new ArrayList<String> (); addProduct = new ArrayList<ArrayList <String>> (); /** START - Create ArrayList for each item and add to HashMap**/ ArrayList <String> c1 = new ArrayList<String>(); ArrayList <String> c2 = new ArrayList<String>(); c1.add('computer'); c1.add('Apple'); c1.add('iPad2'); c1.add('499.00'); c2.add('computer'); c2.add('Asus'); c2.add('Zenbook'); c2.add('1449.00'); ArrayList <String> tv1 = new ArrayList<String>(); ArrayList <String> tv2 = new ArrayList<String>(); tv1.add('television'); tv1.add('Panasonic'); tv1.add('Viera'); tv1.add('899.00'); tv2.add('television'); tv2.add('Samsung'); tv2.add('Series 6'); tv2.add('1597.00'); ArrayList <String> a1 = new ArrayList<String>(); ArrayList <String> a2 = new ArrayList<String>(); a1.add('audio'); a1.add('Bose'); a1.add('321 GS Series III'); a1.add('999.00'); a2.add('audio'); a2.add('Onkyo'); a2.add('HT-S3400'); a2.add('329.00'); /** END - Create ArrayList for each item and add to HashMap **/ /** Add entrys to HashMap **/ product.put('CMC769LLA',c1); product.put('CUX31EDH72',c2); product.put('TVTCL50E3',tv1); product.put('TVUN55D6000',tv2); product.put('A321GSIIIBK',a1); product.put('AHTS3400',a2); } /** For the sake of this example, the productAttribute parameter will be equal to 'computer' **/ public void setProducts(String productAttribute) { for (Map.Entry <String, ArrayList<String>> entry : product.entrySet()) /** Loop through all entrys in the HashMap **/ { for (String s: entry.getValue()) /** Loop through all values in HashMap**/ { /** Add product attributes **/ if (s.equals(productAttribute)) /** Check to see if param exists in the value set**/ { /** Add key to buildProduct ArrayList **/ buildProduct.add(entry.getKey()); /*Loop through values of the corresponding key and add to buildProduct*/ for (Iterator<String> i = entry.getValue().iterator(); i.hasNext();) { Object item = i.next(); buildProduct.add(item.toString()); } /** Add buildProduct arrayList to product arrayList **/ addProduct.add(buildProduct); break; /** Exit nested loop**/ } } } } }

For the desired output we can assume that the productAttribute parameter value is 'Computer'.
Current output of the addProduct ArrayList:

Desired output of the addProduct ArrayList:

I can't seem to figure out what I'm doing wrong. Any help would be greatly appreciated.

Marshal

posted 8 years ago

So you have a map which maps a String to a list of Strings. And if I understand your example right, you want to mutate that into a list of lists of Strings, where each of the inner lists comprises a key of the map followed by the list it's mapped to?
Well, looking at the lists of Strings you have in your example, I don't understand why they are lists of Strings. To me they ought to be some kind of objects which are designed specifically for these products, because obviously the first entry in the list is some kind of a category, the second entry is a manufacturer, and so on. Just putting those things in a list is a misuse of lists.
And likewise I don't see the point of making a slightly different list which just has the product code on the front. Perhaps it should be part of the product object which I was just suggesting. Making a list of products would make a lot of sense once you've done that, which is basically your non-OO requirement anyway.

Greenhorn

posted 8 years ago

Thanks for the reply Paul. Yes, your understanding of what I'm trying to do is correct. Is there any chance you could provide some pseudo code on a better way of accomplishing the task at hand?

Saloon Keeper

posted 8 years ago

Javascript Key Value Pairs

This might be the beginnings of such a class. For the string types, other custom-made classes may be more appropriate; that depends on the design of your app and your requirements.