19.04.2020

Java Generating All Key Value Pairs From List

Java Generating All Key Value Pairs From Listing
Key Value Pair In Java
Java Generating All Key Value Pairs From List Of 2017
Java Name Value Pair Collection

Greenhorn

Create a list of key value objects. Ask Question Asked 6 years, 7 months ago. A Java collection of value pairs? (tuples?) 456. Tube sticking out of my roof? Why does a permanent, non-moving magnet, stuck to a long piece of metal generate a voltage? I need to implement a structure in Java that is a key-value list (of types Integer-String) and I want to shuffle it. Basically, I would like to do something like that. Public LinkedHashMap<. The Java Keytool is a command line tool which can generate public key / private key pairs and store them in a Java KeyStore. The Keytool executable is distributed with the Java SDK (or JRE), so if you have an SDK installed you will also have the Keytool executable. The Keytool executable is called keytool. To execute it, open a command line.

posted 8 years ago

How to get all pairs of a set efficiently? So the 'index' value could change. How to find object pairs in the same list in Java in a good way. Oct 26, 2013 HashMap can be used to store key-value pairs. But sometimes you may want to store multiple values for the same key. For example: For Key A, you want to store. Fetching Keys and Values: the get method: Hashtable Basics « Collections « Java Tutorial. If the key is found for a key-value pair entry, its value will be returned. Remove all values from Java Hashtable: 9.48.24. Remove value from Java Hashtable.

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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

Java Generating All Key Value Pairs From Listing

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

Key Value Pair In Java

posted 8 years ago All

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.

If the key is found for a key-value pair entry, its value will be returned. Photoshop cs6 license key generator mac.

Java Generating All Key Value Pairs From List Of 2017

If not found, null is returned.

Java Name Value Pair Collection

9.48.Hashtable Basics
9.48.1.	Creating Hash Tables
9.48.2.	Adding Key-Value Pairs
9.48.3.	Get all keys and elements from a hash table
9.48.4.	Copying all the key-value pairs from one Hashtable (or any Map) into another Hashtable: the putAll() method
9.48.5.	Displaying Hash Table Contents
9.48.6.	Removing Key-Value Pairs: call the remove() method with the specific key as its argument
9.48.7.	To get rid of all key-value pairs: call the clear() method
9.48.8.	Sizing Hash Tables
9.48.9.	Fetching Keys and Values: the get() method
9.48.10.	To perform some operation on all keys: the keys() or keySet() methods
9.48.11.	Using the elements() or the values() method to get the set of all the values in the hash table
9.48.12.	Getting elements (key-value pairs) from a Hashtable: the entrySet() method
9.48.13.	Finding Elements
9.48.14.	contains() and containsValue(): check to see if a specific value is found within the Hashtable
9.48.15.	Cloning Hash Tables
9.48.16.	Hashtable Immutability: to make the table read-only using Collections.unmodifiableMap(Map map)
9.48.17.	Counting Word Occurrences with a hash table
9.48.18.	uses a generic Hashtable to store the names of bank depositors and their current balances
9.48.19.	Check if a particular key exists in Java Hashtable
9.48.20.	Check if a particular value exists in Java Hashtable
9.48.21.	Iterate through keys of Java Hashtable
9.48.22.	Iterate through values of Java Hashtable
9.48.23.	Remove all values from Java Hashtable
9.48.24.	Remove value from Java Hashtable
9.48.25.	Get Collection of Values from Hashtable
9.48.26.	Get Set view of Keys from Hashtable
9.48.27.	Scan the content of a hashtable
9.48.28.	Sort keys in an Hashtable
9.48.29.	Use iterators with a Hashtable.