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1. Top results related to 8 functions of dictionary in java code

   • Dictionary of ArrayLists in Java

     Top Answer

     Answered Jun 05, 2012 · 2 votes

     Instead of ArrayList grades; you'd have to use ArrayList grades = new ArrayList();

     Yet better: ArrayList<Float> grades = new ArrayList<Float>(); //or use Double or Number

     Note that unlike C or C++ creating a variable doesn't create the object as well. In C++ you could imagine your code as ArrayList* grades; i.e. you'd just create the reference/pointer here.

     Additional thoughts:

     • Dictionary studentGrades; this will be initialized to null.
     • public void main(String[] args) that's not a valid main function since it would have to be static
     • if you have a public static void main(String[] args) you can't use this since you don't have an object instance in the static context
     • You can't instantiate Dictionary since it is abstract. Use one of its subclasses, e.g. new Hashtable<String, List<Float>>(), or a map, e.g. Map<String, List<Float> dictionary = new HashMap<String, List<Float>>();
     • Note that local primitive variables are also not initialized, so this could give you an error too: boolean res; In Java only class members are initialized, local variables are not.

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     1/5

   • Dictionary sorting of ArrayList of Arraylist in java

     Top Answer

     Answered Mar 23, 2019 · 2 votes

     Comparator functions that contain 1 or -1 are error prone.

     Instead, you should write it like this:

     public static int lexicographically(List<Integer> a, List<Integer> b) { for (int i = 0, end = Math.min(a.size(), b.size()); i < end; i++) { int res = Integer.compare(a.get(i), b.get(i)); if (res != 0) return res; } return Integer.compare(a.size(), b.size());}

     This style of writing comparator functions prevents various common mistakes, such as never returning 0.

     The most important pattern in this style is:

     • Compare by the first criterion.
     • If the given values differ, return the comparison result and be done.
     • Take the next criterion, continue with step 1.
     • If there are no criteria left, return 0.

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     2/5

   • Java 8 : how to extract a HashMap from a ArrayList of HashMap in Java 8 using streams?

     Top Answer

     Answered May 29, 2020 · 2 votes

     Here's complete example how to do it

     import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.stream.Collectors;-public class Main { public static void main(String[] args) { List<HashMap<String, String>> input = new ArrayList<>(); HashMap<String, String> subinput1 = new HashMap<>(); subinput1.put("name", "name1"); subinput1.put("rollno", "rollno1"); input.add(subinput1); HashMap<String, String> subinput2 = new HashMap<>(); subinput2.put("name", "name2"); subinput2.put("rollno", "rollno2"); input.add(subinput2); HashMap<String, HashMap<String, String>> result = (HashMap<String, HashMap<String, String>>) input.stream() .collect(Collectors.toMap(v -> (String) v.get("rollno"), e -> e)); System.out.println(result); }}

     It iterates over a collection of HashMaps, takes the key in which it should be stored in the result HashMap, then it creates a Map of Maps where the key is the "rollno" from the input map, and value is the input map itself.

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     3/5

   • Java code to display expiration date of certificates in a Java KeyStore

     Top Answer

     Answered Dec 16, 2019 · 16 votes

     import java.io.FileInputStream;import java.security.KeyStore;import java.util.Enumeration;import java.io.IOException;import java.security.KeyStoreException;import java.security.NoSuchAlgorithmException;import java.security.UnrecoverableEntryException;import java.security.cert.Certificate;import java.security.cert.CertificateException;import java.security.cert.X509Certificate;import java.util.Date;import java.text.SimpleDateFormat;import java.util.*;public class GetSslcertsExpires {public static void main(String[] argv) throws Exception { try { KeyStore keystore = KeyStore.getInstance(KeyStore.getDefaultType()); keystore.load(new FileInputStream("/DemoTrust.jks"), "DemoTrustKeyStorePassPhrase".toCharArray()); Enumeration aliases = keystore.aliases(); for(; aliases.hasMoreElements();) { String alias = (String) aliases.nextElement(); Date certExpiryDate = ((X509Certificate) keystore.getCertificate(alias)).getNotAfter(); SimpleDateFormat ft = new SimpleDateFormat ("yyyy-MM-dd HH:mm:ss"); //Tue Oct 17 06:02:22 AEST 2006 Date today = new Date(); long dateDiff = certExpiryDate.getTime() - today.getTime(); long expiresIn = dateDiff / (24 * 60 * 60 * 1000); System.out.println("Certifiate: " + alias + "\tExpires On: " + certExpiryDate + "\tFormated Date: " + ft.format(certExpiryDate) + "\tToday's Date: " + ft.format(today) + "\tExpires In: "+ expiresIn); } }catch (Exception e) { e.printStackTrace(); } }}

     • Sample Output

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     4/5

   • Java code is running properly in output section but not runs in terminal section of vs code

     Top Answer

     Answered Sep 18, 2023 · 0 votes

     You are using Code Runner to run the program, which is not a best practice. You'd better use the official Java extension package to execute the program.

     You can click Run or Debug on the code editing page to run or debug the program.

     You can also select Run Java from the triangle button in the upper right corner.

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     5/5

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2. stackoverflow.com › questions › 78371046Storing functions of multiple classes in one dictionary

   stackoverflow.com › questions › 78371046

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   Apr 23, 2024 · Function Code: def similarityMatch(wordFound, playerClass, **kwargs): #Handles the calling of player functions using a dict that contains every function for each class. wordFound is based off of the player's corpus, thus not allowing a player to use a feature outside his class. #Kwarg sorting is necessary depending on the whichever functions ...

3. coderprog.com › java-cheat-codes-popular-functionsJava Cheat Codes: Most Popular Functions – CoderProg

   coderprog.com › java-cheat-codes-popular-functions

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   Apr 20, 2024 · Code Challenges are interactive coding exercises with real-time feedback, so you can get hands-on coding practice alongside the course content to advance your programming skills. Table of Contents. Introduction 1 Java methods 2 What you should know 3 CoderPad tour 4 Using GitHub Codespaces. Introduction to Java Methods 5 Classes and methods 6 ...

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5. www.geeksforgeeks.org › functions-programmingFunctions in Programming - GeeksforGeeks

   www.geeksforgeeks.org › functions-programming

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   4 days ago · Functions in Programming enable the reuse of code by encapsulating a specific functionality. Once a function is defined, it can be called multiple times from different parts of the program, reducing redundancy and promoting efficient code maintenance. Functions can be called multiple times, reducing code duplication. C++ Java Python JavaScript.

6. www.geeksforgeeks.org › list-of-all-java-keywordsJava Keywords - GeeksforGeeks

   www.geeksforgeeks.org › list-of-all-java-keywords

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   Apr 22, 2024 · A Java keyword is used to restrict the precision and rounding of floating-point calculations to ensure portability. super. Refers to a class’s base class (used in a method or class constructor) switch. A statement that executes code based on a test value. synchronized.

7. www.geeksforgeeks.org › basic-string-operationsBasic String Operations with Implementation - GeeksforGeeks

   www.geeksforgeeks.org › basic-string-operations

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   May 3, 2024 · In this post, we will look into some of the basic String operations such as: Accessing characters by index in a string. Inserting character into a String. Modifying character in String. Deletion of Character in String. Concatenating strings (combining multiple strings into one). Finding the length of a string.

8. www.teachoo.com › 21952 › 4559[Class 11] Dictionary methods and built-in functions - Teachoo

   www.teachoo.com › 21952 › 4559

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   Apr 16, 2024 · Exclusive offer: Get an ad-free learning experience on Teachoo for ₹199 ₹29 per day. Join Now - Limited Time Offer. No commitment, cancel anytime. Next: MCQ Questions (1 Mark each) → Go Ad-free. Computer Science - Class 11. Chapter 10 Class 11 - Tuples and Dictionaries.

9. www.baeldung.com › java-iterate-string-charactersHow to Iterate Over the String Characters in Java | Baeldung

   www.baeldung.com › java-iterate-string-characters

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   1 day ago · 2.1. for Loop. We can use a simple for loop to iterate over the characters of a string. This method has a time complexity of O (n), where n is the length of the string str, and a space complexity of O (1) because it only requires a single loop variable: String str = "Hello, Baeldung!" for ( int i = 0; i < str.length(); i++) {.