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1. Top results related to eight function of dictionary in java

   • 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

   • Eight queens in Java in recursion

     Top Answer

     Answered Nov 25, 2012 · 0 votes

     In Java, when you pass the object to the method, you copy the reference to the object. So, changes made to the object are visible by all references to that object (including the one you keep in the calling method).

     There are two solutions for it:

     • Copy the HashSet before doing modifications, and do the modifications to the copy. In case a solution is found, return the new copy. In case it does not work, return the original copy.
     • Use a data structure thtat depends in an index, so you can ignore all values that should not still be set. For example an array, if you are iterating for the 5th queen you can ignore the values of the fifth, sixth, seventh and eighth queens if they are set.

     I find more clear the queens problem implemented with an int array, but that is left to everybodys taste.

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     3/5

   • Function of jxl.jar in java

     Top Answer

     Answered May 09, 2011 · 1 votes

     jxl.jar is the library of JExcelApi , which is a open source java API to read, write, and modify Excel spreadsheets dynamically. It contains all the compiled *.class files, associated metadata and resources that are used by the Java Excel API internally .

     Java library are distributed as a .jar file .You can refer to this for more info about JAR.

     As the official API of JExcelApi does not contain a file called jxl.java .I believe this is the Java class created by you to test the function of JExcelApi . To use the JExcelApi , you have to import the necessary classes from the jxl.jar and specified jxl.jar to be on the class path when you compile jxl.java .

     So , the connection between jxl.java and jxl.jar is that jxl.java calls the classes from jxl.jar to manipulate the Excel.

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     4/5

   • In Java why we need an object to call a function in the main function of the same class but no object for other function which is not main?

     Top Answer

     Answered Mar 12, 2020 · 1 votes

     Because the main method is outside the class and so you have to create an instance of the class with which you can access the methods of the class

     and if your main method is within the class, you can use the methods in the main method without creating an object, but your methods must be static

     Also check this please Java OOP

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     5/5

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2. docs.oracle.com › api › javaDictionary (Java Platform SE 8 ) - Oracle

   docs.oracle.com › api › java

   • Cached

   The Dictionary class is the abstract parent of any class, such as Hashtable, which maps keys to values. Every key and every value is an object. In any one Dictionary object, every key is associated with at most one value. Given a Dictionary and a key, the associated element can be looked up.

   • Use

     Provides a set of "lightweight" (all-Java language)...

   • DoubleSummaryStatistics

     Implementation Note: This implementation is not thread safe....

   • Java.Util Class Hierarchy

     Hierarchy For Package java.util Package Hierarchies: All...

   • Hashtable

     Returns a Set view of the mappings contained in this map....

   • Enumeration

     An object that implements the Enumeration interface...

   • Map

     An object that maps keys to values. A map cannot contain...

   • Frames

     Frame Alert. This document is designed to be viewed using...

   • Package

     A comparison function, which imposes a total ordering on...

3. stackoverflow.com › questions › 1145175What's the most practical way to have "functions in a ...

   stackoverflow.com › questions › 1145175

   Jul 19, 2013 · When programming with C/C++ or Python I sometimes used to have a dictionary with references to functions according to the specified keys. However, I don't really know how to have the same -- or at the very least similar -- behavior in Java allowing me dynamic key-function (or method, in Java slang) association.

4. www.geeksforgeeks.org › dictionary-get-method-inDictionary get() Method in Java with Examples - GeeksforGeeks

   www.geeksforgeeks.org › dictionary-get-method-in

   • Cached

   Dec 27, 2018 · The get () method of Dictionary class is used to retrieve or fetch the value mapped by a particular key mentioned in the parameter. It returns NULL when the dictionary contains no such mapping for the key. Syntax: DICTIONARY.get(Object key_element)

5. www.geeksforgeeks.org › dictionary-elements-methodDictionary elements() Method in Java with Examples

   www.geeksforgeeks.org › dictionary-elements-method

   • Cached

   Dec 27, 2018 · The keys() method of Dictionary class in Java is used to get the enumeration of the values present in the dictionary. Syntax: Enumeration enu = DICTIONARY.elements() Parameters: The method does not take any parameters. Return value: The method returns an enumeration of the values of the Dictionary.

6. thelinuxcode.com › create-a-dictionary-in-javaThe Complete Guide to Effectively Using Dictionaries in Java

   thelinuxcode.com › create-a-dictionary-in-java

   • Cached

   Dec 27, 2023 · In this comprehensive guide, you‘ll learn all about dictionaries and how to leverage them in your Java programs like a pro! We‘ll cover: What dictionaries are and their real-world use cases. How to create dictionaries using HashMap and Hashtable. Methods for adding, accessing, removing and iterating over entries.

7. www.javatpoint.com › dictionary-class-in-javaDictionary Class in Java - Javatpoint

   www.javatpoint.com › dictionary-class-in-java

   • Cached

   We can store, retrieve, remove, get, and put values in the dictionary by using the Java Dictionary class. In this section, we will discuss the JavaDictionary class that stores data in key-value pairs just like the Map interface.

8. People also ask

   What is a dictionary class in Java?

   • Java Dictionary class is an abstract class parent class of any class. It belongs to java.util package. Its direct known subclass is the Hashtable class. Like the Hashtable class, it also maps the keys to values. Note that every key and value is an object and any non-null object can be used as a key and as a value.

   Dictionary Class in Java - Javatpoint

   www.javatpoint.com/dictionary-class-in-java

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   How to get enumeration of a dictionary in Java?

   • The keys () method of Dictionary class in Java is used to get the enumeration of the values present in the dictionary. Syntax: Parameters: The method does not take any parameters. Return value: The method returns an enumeration of the values of the Dictionary. Program 2:

   Dictionary elements() Method in Java with Examples

   www.geeksforgeeks.org/dictionary-elements-method-in-java-with-examples/

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   What are dictionaries in Java?

   • Keys and values can be any Java object. Common implementations are HashMap and Hashtable. Not thread-safe by default. Dictionaries go by other names like maps, hashmaps or associative arrays in other languages. But the key concept remains – pair data using keys for easy access. Here are some common use cases for dictionaries in Java:

   The Complete Guide to Effectively Using Dictionaries in Java

   thelinuxcode.com/create-a-dictionary-in-java/

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   What is the use of GET() method of dictionary class?

   • The get () method of Dictionary class is used to retrieve or fetch the value mapped by a particular key mentioned in the parameter. It returns NULL when the dictionary contains no such mapping for the key. Syntax:

   Dictionary get() Method in Java with Examples - GeeksforGeeks

   www.geeksforgeeks.org/dictionary-get-method-in-java-with-examples/

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9. docs.oracle.com › util › class-useUses of Class java.util.Dictionary (Java Platform SE 8 ) - Oracle

   docs.oracle.com › util › class-use

   • Cached

   Packages that use Dictionary. Provides the classes and interfaces for the security framework. Contains the collections framework, legacy collection classes, event model, date and time facilities, internationalization, and miscellaneous utility classes (a string tokenizer, a random-number generator, and a bit array).