Share

Search Java Code Snippets


  Help us in improving the repository. Add new snippets through 'Submit Code Snippet ' link.





#Java - Code Snippets for '#Map.Entry' - 12 code snippet(s) found

 Sample 1. Write a Program for Graph Breadth First Traversal using Apache Commons MultiMap

import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

import com.google.common.collect.ArrayListMultimap;
import com.google.common.collect.Multimap;

public class Graph {
   private static Multimap<Integer,Integer> adjacentDirectedNodesMap = ArrayListMultimap.create();
   private static Set<Integer> alreadyVisited = new HashSet();
   
   static{
      adjacentDirectedNodesMap.put(1, 2);
      adjacentDirectedNodesMap.put(1, 3);
      adjacentDirectedNodesMap.put(1, 5);
      adjacentDirectedNodesMap.put(2, 4);
      adjacentDirectedNodesMap.put(4, 5);
   }
   
   public static void main(String[] args){
      ArrayList visited = new ArrayList();
      
      Integer startNode = 1;
      
      displayAdjacentNodes(startNode);
      
   }
   
   private static void displayAdjacentNodes(Integer integer){
      System.out.println(integer);
      for(Map.Entry<Integer, Collection<Integer>> adjacentNodes: adjacentDirectedNodesMap.asMap().entrySet()){
         for(Integer integer1:adjacentNodes.getValue()){
            if(alreadyVisited.contains(integer1)){
               continue;
            }
            alreadyVisited.add(integer1);
            System.out.println(integer1);
         }
      }
   }
   
}

   Like      Feedback     graph traversal  breadth first traversal


 Sample 2. Method to remove duplicates from a Map ( string and List of objects ) by matching the member field of the object.

Map<String,List<ClassInfoBean>> removeDuplicates(Map<String, List<ClassInfoBean>> interfaceMap){
   Map<String, List<ClassInfoBean>> interfaceMapWithoutDuplicate = new HashMap();
      
   for(Map.Entry<String, List<ClassInfoBean>> entry: interfaceMap.entrySet()){
      List<ClassInfoBean> classListWithoutDuplicate = new ArrayList();
      boolean alreadyContain = false;
      for(ClassInfoBean classes: entry.getValue()){
         for(ClassInfoBean classes1: classListWithoutDuplicate){
            if(classes1.name.equalsIgnoreCase(classes.name)){
               alreadyContain = true;
               break;
            }
         }
         if(alreadyContain == false){
            classListWithoutDuplicate.add(classes);
         }
      }
      interfaceMapWithoutDuplicate.put(entry.getKey(), classListWithoutDuplicate);
   }
      
   return interfaceMapWithoutDuplicate;
}

   Like      Feedback     map  map of list of objects  remove duplicates from map  Map.Entry


 Sample 3. Method to get a map of words and their count by passing in the string

Map<String,Integer> wordCountMap = new TreeMap();
String[] words = text.split(" ");
Set<Integer> countSet;
for(String word: words) {
if(wordCountMap.containsKey(word.toLowerCase())){
wordCountMap.put(word.toLowerCase(), wordCountMap.get(word.toLowerCase()).intValue() + 1);
} else {
wordCountMap.put(word.toLowerCase(), 1);
}
}

countSet = new TreeSet(Collections.reverseOrder());
countSet.addAll(wordCountMap.values());

for(Integer inte: countSet) {
for(Entry<String,Integer> entry: wordCountMap.entrySet()){
if(entry.getValue() == inte) {
System.out.println(entry);
}
}
}

   Like      Feedback     map  word count  map of string and integer  containsKey  string split  treeset  Collections.reverseOrder  set addAll   entry


 Sample 4. Write a Program for coin changer application. The program should set the cash box with available currency and then should render the exact change. If enough cash is not available , it should present the appropriate message.

import java.util.Map;
import java.util.Map.Entry;
import java.util.TreeMap;


public class CoinChanger {

enum Currency {
DOLLAR(1),QUARTER(.25),DIME(.10),NICKEL(.05),PENNY(.01);

private double currencyValue;

Currency(double value){
currencyValue = value;
}

double getCurrencyValue(){
return this.currencyValue;
}
}

private static Map<Currency, Integer> cashBox;
private static Map<Currency, Integer> change;

static {
cashBox = new TreeMap<Currency, Integer>();
change = new TreeMap<Currency, Integer>();
initializeCashBox();
}



public static void main(String[] args) {
double amountToReturn = 18.79f; // Set the amount to be changed here

for(Entry<Currency, Integer> entry:cashBox.entrySet()){
Currency currency = (Currency)entry.getKey();
int coinCount = (int)(amountToReturn/(entry.getKey().getCurrencyValue()));
int availableCurrency = (int)(entry.getValue());

if(coinCount > availableCurrency){
coinCount = availableCurrency;
}

change.put(currency, coinCount);
if(coinCount > 0){
amountToReturn = amountToReturn - (coinCount * entry.getKey().getCurrencyValue());
}
}

System.out.println(change);

if(amountToReturn > .1){
System.out.println("Not enough cash");
}
}

private static void initializeCashBox(){
//set the cash box
cashBox.put(Currency.DOLLAR, 50);
cashBox.put(Currency.QUARTER, 0);
cashBox.put(Currency.DIME, 50);
cashBox.put(Currency.NICKEL, 50);
cashBox.put(Currency.PENNY, 50);

}
}

   Like      Feedback     coin changer application  coin changer app


Subscribe to Java News and Posts. Get latest updates and posts on Java from Buggybread.com
Enter your email address:
Delivered by FeedBurner
 Sample 5. Usage of org.apache.spark.SparkConf

SparkConf sparkConf = new SparkConf();
for (Map.Entry<String, String> e : conf) {
if (e.getKey().startsWith("spark.")) {
sparkConf.set(e.getKey(), e.getValue());
}
}
this.sparkContext = new JavaSparkContext(sparkConnect, getName(), sparkConf);

   Like      Feedback     


 Sample 6. Code Sample / Example / Snippet of org.mortbay.jetty.servlet.FilterHolder

  protected void defineFilter(WebApplicationContext ctx, String name,

String classname, Map<String, String> parameters, String[] urls) {



WebApplicationHandler handler = ctx.getWebApplicationHandler();

FilterHolder holder = handler.defineFilter(name, classname);

if (parameters != null) {

for(Map.Entry<String, String> e : parameters.entrySet()) {

holder.setInitParameter(e.getKey(), e.getValue());

}

}



for (String url : urls) {

handler.addFilterPathMapping(url, name, Dispatcher.__ALL);

}

}


   Like      Feedback      org.mortbay.jetty.servlet.FilterHolder


 Sample 7. Code Sample / Example / Snippet of org.mortbay.jetty.servlet.WebApplicationHandler

  protected void defineFilter(WebApplicationContext ctx, String name,

String classname, Map<String, String> parameters, String[] urls) {



WebApplicationHandler handler = ctx.getWebApplicationHandler();

FilterHolder holder = handler.defineFilter(name, classname);

if (parameters != null) {

for(Map.Entry<String, String> e : parameters.entrySet()) {

holder.setInitParameter(e.getKey(), e.getValue());

}

}



for (String url : urls) {

handler.addFilterPathMapping(url, name, Dispatcher.__ALL);

}

}


   Like      Feedback      org.mortbay.jetty.servlet.WebApplicationHandler


 Sample 8. Code Sample / Example / Snippet of com.mongodb.DBObject

  private Enumerable<Object> find(DB mongoDb, String filterJson,

String projectJson, List<Map.Entry<String, Class>> fields) {

final DBCollection collection =

mongoDb.getCollection(collectionName);

final DBObject filter =

filterJson == null ? null : (DBObject) JSON.parse(filterJson);

final DBObject project =

projectJson == null ? null : (DBObject) JSON.parse(projectJson);

final Function1<DBObject, Object> getter = MongoEnumerator.getter(fields);

return new AbstractEnumerable<Object>() {

public Enumerator<Object> enumerator() {

final DBCursor cursor = collection.find(filter, project);

return new MongoEnumerator(cursor, getter);

}

};

}


   Like      Feedback      com.mongodb.DBObject


 Sample 9. Code Sample / Example / Snippet of com.mongodb.DBCollection

  private Enumerable<Object> find(DB mongoDb, String filterJson,

String projectJson, List<Map.Entry<String, Class>> fields) {

final DBCollection collection =

mongoDb.getCollection(collectionName);

final DBObject filter =

filterJson == null ? null : (DBObject) JSON.parse(filterJson);

final DBObject project =

projectJson == null ? null : (DBObject) JSON.parse(projectJson);

final Function1<DBObject, Object> getter = MongoEnumerator.getter(fields);

return new AbstractEnumerable<Object>() {

public Enumerator<Object> enumerator() {

final DBCursor cursor = collection.find(filter, project);

return new MongoEnumerator(cursor, getter);

}

};

}


   Like      Feedback      com.mongodb.DBCollection


Subscribe to Java News and Posts. Get latest updates and posts on Java from Buggybread.com
Enter your email address:
Delivered by FeedBurner
 Sample 10. Code Sample / Example / Snippet of java.util.Properties

    public Connection createConnection() throws SQLException {

final Properties info = new Properties();

for (Map.Entry<String, String> entry : map.entrySet()) {

info.setProperty(entry.getKey(), entry.getValue());

}

Connection connection =

DriverManager.getConnection("jdbc:calcite:", info);

for (ConnectionPostProcessor postProcessor : postProcessors) {

connection = postProcessor.apply(connection);

}

return connection;

}


   Like      Feedback      java.util.Properties


 Sample 11. Given a Map with Country Name as key and its capitals as values, Find the name of countries having more than 1 capital ?

Map<String,List<String>> capitals = new HashMap();
capitals.put("United States", Arrays.asList("Washington DC"));
capitals.put("Canada", Arrays.asList("Ottawa"));
capitals.put("South Africa", Arrays.asList("Pretoria", "Cape Down", "Bloemfontein"));
      
for(Map.Entry<String,List<String>> entry: capitals.entrySet()){
   if(entry.getValue().size() > 1){
      System.out.println(entry.getKey());
   }
}

   Like      Feedback     Map of String and List


 Sample 12. Sort Entries of a Map by Value

public class BuggyBread {
   public static void main(String args[]) {
      Map<String,Integer> wordLength = new HashMap();
      
      String str = "We are what we repeatedly do; excellence, then, is not an act but a habit";
      
      for(String word: str.split(" ")){
            wordLength.put(word, word.length());
      }
      
      List<Map.Entry<String, Integer>> list = new LinkedList<Map.Entry<String, Integer>>( wordLength.entrySet() );
      
      Collections.sort( list, new Comparator<Map.Entry<String, Integer>>()
{
public int compare( Map.Entry<String, Integer> o1, Map.Entry<String, Integer> o2 )
{
return (o1.getValue()).compareTo( o2.getValue() ) * -1;
}
} );
      
      System.out.println(list);
      
   }
}

   Like      Feedback     



Subscribe to Java News and Posts. Get latest updates and posts on Java from Buggybread.com
Enter your email address:
Delivered by FeedBurner



comments powered by Disqus