java - Sort HashTable according to values(numeric) preferably ...

5 Answers Sorted by: 2 You could sort the entries in the hash table instead, with a custom implementation of Comparator<Map.Entry<...>> which just compared the values. Then you'd have a sorted array of entries, and you can just iterate over them picking out both keys and values as you go.

Hashtable (Java Platform SE 8 ) - Oracle

This class implements a hash table, which maps keys to values. Any non- null object can be used as a key or as a value. To successfully store and retrieve objects from a hashtable, the objects used as keys must implement the hashCode method and the equals method. An instance of Hashtable has two parameters that affect its performance: initial ...

An Introduction to java.util.Hashtable Class | Baeldung

1. Overview Hashtable is the oldest implementation of a hash table data structure in Java. The HashMap is the second implementation, which was introduced in JDK 1.2. Both classes provide similar functionality, but there are also small differences, which we'll explore in this tutorial. 2. When to Use Hashtable

java - Sorting HashMap by values - Stack Overflow

java - Sorting HashMap by values - Stack Overflow Sorting HashMap by values [duplicate] Ask Question Asked 11 years, 6 months ago Modified 1 year ago Viewed 528k times 164 This question already has answers here : Sort a Map<Key, Value> by values (64 answers) Closed 7 years ago. I need to sort my HashMap according to the values stored in it.

Hash Tables - Princeton University

Java conventions. Java helps us address the basic problem that every type of data needs a hash function by requiring that every data type must implement a method called hashCode() (which returns a 32-bit integer). The implementation of hashCode() for an object must be consistent with equals.That is, if a.equals(b) is true, then a.hashCode() must have the same numerical value as b.hashCode().

How to sort Hashtable in java - BeginnersBook

The solution The are ways to sort Hashtable using Collections.list and Collections.sort, however best thing to do is use LinkedHashMap or TreeMap. Use LinkedHashMap: When you want to preserve the insertion order. Use TreeMap: When you want to sort the key-value pairs. Lets take the same example using LinkedHashMap and TreeMap: Using LinkedHashMap

Sorting in Java - GeeksforGeeks

It is as simple sorting with the help of linear and non-linear data structures present within java. So there is sorting done with the help of brute force in java with the help of loops and there are two in-built methods to sort in Java. Ways of sorting in Java Using loops Using sort () method of Arrays class Using sort method of Collections class

Java Hashtable: Sorted by Values | MrTextminer’s Weblog

There are two important things: 1) Create an inner (or ordinary) class that implements Comparator class and 2) Use Collections.sort() method for sorting. Here is a working source code. import java.util.ArrayList; import java.util.Collections; import java.util.Comparator; import java.util.Hashtable; import java.util.Iterator; import java.util.Map;

Hash Sort Algorithm - GeeksforGeeks

Hash function Mash function, which helps the super-hash function to allocate the data values to unique addresses (i.e. no collision happens) in a consistent way (means no scattering of the data). Now, these mappings of data values obtained from super-hash functions are utilized by the main hash sort methods.

Java - Sorting Hashtable contents - BenchResources.Net

1. Sorting Hashtable contents: Ascending order: pass Hashtable entries as arguments to TreeSet class’ inter-conversion constructor Descending order: implement Comparator interface by providing reverse sorting logic and finally putting all entries of Hashtable to TreeMap class’ using putAll (); method of Map interface
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