Hashmap With Random Generated Keys

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Is there a way to get the value of a HashMap randomly in Java? Of Course, below is a simple Java Code which represents the same.

  1. Hashmap With Random Generated Keys In Windows 10
  2. Hashmap With Random Generated Keys In Java
  3. Java Hashmap Get Keys

Also, at the end of program there is a bonus code to Shuffle complete HashMap. Reshuffling a large collection is always going to be expensive. You are going to need at least one reference per entry. e.g. for 1 million entries you will need approx 4 MB.

Jul 08, 2019  I am a programmer, a runner, a recreational diver, currently live in the island of Bali, Indonesia.Mostly programming in Java, Spring Framework, Hibernate / JPA. Mar 05, 2009  store all the word in the HashMap as HashMap hm=new HashMap; and put the word as hm.put(SN,word); where SN is the serial number it is a counter starts from 0 to total number of words. Then use Math.random to generate the random number. For finding the key multiply the random number to the hashmap size and find the random word.

Note; the shuffle operation is O(N)

CrunchifyGetRandomKeyValueFromHashMap.java

Hashmap With Random Generated Keys In Windows 10

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importjava.util.Collections;
importjava.util.List;
importjava.util.Random;
/**
*
publicstaticvoidmain(String[]args){
// Create a hashtable and put some key-value pair.
HashMap<String,String>companies=newHashMap<String,String>();
companies.put('Paypal','North San Jose');
companies.put('Yahoo','Santa Clara');
Object[]crunchifyKeys=companies.keySet().toArray();
Objectkey=crunchifyKeys[newRandom().nextInt(crunchifyKeys.length)];
System.out.println('************ Random Value ************ n'+key+' :: '+companies.get(key));
List<Map.Entry<String,String>>list=newArrayList<Map.Entry<String,String>>(companies.entrySet());
// Bonus Crunchify Tips: How to Shuffle a List??
System.out.println('n************ Now Let's start shuffling list ************');
for(Map.Entry<String,String>entry:list){
System.out.println(entry.getKey()+' :: '+entry.getValue());
}

Hashmap With Random Generated Keys In Java

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Output:

Output
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Twitter::San Francisco
************Now Let'sstart shuffling list ************
eBay::South San Jose
Twitter::San Francisco

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Java Hashmap Get Keys

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