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Introduction to Java EnumMap

A Java Collection Framework member known as EnumMap, which extends AbstractMap, is a specific implementation for the interface map, mainly for enumeration types. In addition to that, several other features are also present for EnumMap.

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It includes:

It is not synchronized.

Faster; Compared to this, HashMap is slower.

It is kept in the key’s natural order.

High performance.

Null keys are not allowed. That is, a NullPointerException will be thrown when null keys are present.

Null values can be present.

As keys, enum elements will be used.

More details on Java EnumMap will be discussed in the following sections.

Syntax

Java EnumMap can be declared using the below syntax.

Constructors in Java EnumMap

The following are the constructors that are commonly used in Java EnumMap:

Methods in Java EnumMap

Now, let us see some of the commonly used methods of Java EnumMap.

clear(): Every mapping available in the map will be removed on calling this method.

clone(): A shallow copy will be returned for the enum map mentioned.

containsKey(Objectk): True will be returned if the map has a mapping for the mentioned key k.

containsValue(Objectv): True will be returned if the map maps 1 or more than 1 key to the mentioned value v.

equals(Objectob): Map and the mentioned object ob will be compared for equality.

get(Objectk): Value will be returned if the map has a mapping for the mentioned key k. If there is no value for the key, null will be returned.

hashCode(): Hash code will be returned for the map.

keySet(): A set view will be returned for the keys that are present on the map.

put(Kkey, V value): The value v will be associated with the key K on the map.

remove(Objectk): Mapping will be removed for the key k that is mentioned.

size(): Count of key-value mappings available in the map will be returned.

values(): A collection view will be returned for the values available on the map.

Examples to Implement Java EnumMap

In order to understand more about the Java Enum Map, let us implement the above-mentioned methods in some programs.

Example #1

Sample program to create an enum map and copy the elements to another enum map.

Code:

Explanation to the above program: In the above program, two enum maps are created. The first map is created with 2 elements, and the second map is created by copying the elements of the first map. In addition to that, an extra element is also added to the second map. These are done with the help of put() and putAll() methods.

Example #2

Sample program to create an enum map and get the keys and values separately.

Code:

import java.util.EnumMap; class JavaEnumMapExample { enum fruits { APPLE, ORANGE, GRAPES, KIWI } public static void main(String[] args) { fr.put(fruits.APPLE, 2); fr.put(fruits.ORANGE, 5); System.out.println("The key-value pairs in EnumMap 1 is : " + fr); System.out.println("The keys in enum map 1 are : " + fr.keySet()); System.out.println("The values in enum map 1 are : " + fr.values()); fru.putAll(fr); fru.put(fruits.GRAPES, 3); System.out.println("The key-value pairs in EnumMap 2 is : " + fru); System.out.println("The keys in enum map 2 are : " + fru.keySet()); System.out.println("The values in enum map 2 are : " + fru.values()); } }

Output:

Example #3

Sample program to remove an element from the enum map

Code:

Output:

Explanation to the above program: In this program, an element is removed from the map using the remove() method and the resultant enum map is printed in the next step.

Conclusion

A detailed explanation of all the aspects such as declaration, methods, constructors of Java EnumMap is discussed in this document in detail.

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This is a guide to Java EnumMap. Here we discuss syntax, a list of methods, constructors, and examples to implement with proper codes and outputs. You can also go through our other related articles to learn more –

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Java Enum Class, Switch Statement, Methods

Introduction to Java Enum

Java enum is a special class in the Java programming language that represents group constants. It contains unchangeable variables such as variable final. When creating an enum class, we use the enum keyword rather than class or interface. When we use an enum in Java, we use a comma to separate the constants. Within our class, we also use enum.

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Key Takeaways

We are using an enum to create our own classes; we are using an enum keyword for creating our own enum type.

To define the enum in Java, we use the enum keyword. It is a special class representing the constant group, like the final variable.

Overview of Java Enum

In Java, an enum is a special data type that enables variables to set predefined constants. The variable that we have defined is equal to the values that we have defined. Because it will be constants, we can say that the enum example compass directions. The enum-type fields are always in capital letters.

The enumeration in Java represents a group by incorporating named constants into the programming language. In Java, we use an enum when we know that all possible values will be available at the time of compilation. It is not necessary to keep the enum type constants fixed all of the time.

Java Enum Class

In Java, we define enum inside as well as outside of a class. In java, an enum is defined as a class type, so we do not need to instantiate the enum by using new; it will contain the same capabilities as per other classes. This feature makes enumeration useful. Like we give the constructor and also add the instance variables.

We are creating the class name as enum_class as follows:

Code:

public class enum_class { enum Level { LOWER, MEDIUM, HIGHER } public static void main(String[] args) { Level mv = Level.MEDIUM; System.out.println (mv); } }

Output:

In the below example, we are defining the enum datatype outside of the class as follows. We are creating the class name as enum_class as follows.

Code:

enum Color { GREEN, BLACK, BLUE; } public class enum_class { public static void main(String[] args) { Color col = Color.BLUE; System.out.println (col); } }

Output:

Java Enum Switch Statement

We can also pass the enum data type by using a switch statement. The enum data type is used in the switch statement to check the values. The example below shows how an enum is used with a switch statement to define the level as follows.

Code:

enum lev { LOWER, MEDIUM, HIGHER } public class enum_class { public static void main(String[] args) { lev mv = lev.MEDIUM; switch (mv) { case LOWER: System.out.println ("level 1"); break; case MEDIUM: System.out.println ("level 2"); break; case HIGHER: System.out.println ("level 3"); break; } } }

Output:

The below example shows a switch statement with an enum data type as follows. In the below example, we are giving day as an enum data type as follows.

Code:

import java.util.Scanner; enum Day {S, M, TU, W, T, F, SA;} public class enum_class { Day d; public enum_class(Day day) { this.d = day; } public void dayIsLike() { switch (d) { case M: System.out.println ("Mon is second day."); break; case F: System.out.println ("Fri is sixth day"); break; case SA: case S: System.out.println ("Sun is weekend"); break; default: System.out.println ("Tue is third day."); break; } } public static void main(String[] args) { { String str = "M"; enum_class ec = new enum_class(Day.valueOf (str)); ec.dayIsLike (); } } }

Output:

Methods

The enum will contain abstract and concrete methods. If the enum class contains abstract methods, then every instance of the enum class implements the same. The below example shows enum methods as follows.

Below example shows enum methods as follows:

Code:

enum col { WHITE, RED, BLUE; } public class enum_class { public static void main(String[] args) { col arr[] = col.values(); for (col col : arr) { System.out.println (col + "index" + col.ordinal()); } System.out.println (col.valueOf ("RED")); } }

Output:

Constructors

Enum contained the constructor and was executed separately for every enum constant on which we are loading the enum class. We cannot create the objects of the enum explicitly, so we cannot invoke the constructor of the enum directly.

Below example shows the enum constructor as follows:

Code:

enum col { PINK, YELLOW, GREEN; private col() { System.out.println ("Con called: " + this.toString()); } public void colorInfo() { System.out.println ("Uni Color"); } } public class enum_class { public static void main(String[] args) { col cl = col.PINK; System.out.println (cl); cl.colorInfo (); } }

Output:

Java Enum Types

The java enum type is a special data type that enables the variable to set the constant, which was predefined. The variable is equal to the value which we have predefined. In Java, we define the type of enum by using the keyword as an enum. In the below example, we are defining the enum type of color as follows.

Example:

Code:

enum Col { BLUE, PINK, BLACK }

In the below example, we are defining the constant set of numbers as follows:

Code:

public class enum_class { enum number { ONE, TWO , THREE } public static void main(String[] args) { number num = number.TWO; System.out.println (num); } }

Output:

The below example shows java enum types. In the below example, we are defining the enum type of days as follows.

Code:

public class enum_class { enum day { MON, TUE, WED } public static void main(String[] args) { day d = day.TUE; System.out.println (d); } }

Output:

Importance

Enum basically inherits from the enum class, so it won’t inherit any other classes. Below is the importance..

It improves the type of safety.

We are using it easily in a switch.

Enum in Java is traversed.

It contains the constructors, methods, and fields.

It implements the interfaces but will not extend any class; it will internally extend the enum class.

We are using an enum to create our own data types. The enum data type we use to define enum in Java.

Below are the important characteristics as follows:

Constant of the enum is not overridden.

Enum does not support the objects creation.

Enum does not extend the other classes.

Enum implements class-like interfaces.

We are using an enum in a method.

We are using an enum in a constructor.

Conclusion

In Java, an enum is a special data type that enables variables to set predefined constants. The variable that we have defined is equal to the values that we have defined. It is a special class used in the Java programming language to represent group constants. It contains unchangeable variables like variables as final.

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Working Of Scala Random With Examples

Introduction to Scala Random

The Scala Random function generates random numbers or characters in Scala. To generate the Random numbers over Scala, we use the Random process with Scala.util.Random class. The Random number generated can be anything,, be it Integer, Float, Double, or Char. This random no is important for various-level applications such as Validation. So it is used for the Random numbers generation in our Scala Application.

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Syntax:

val r = scala.util.Random r: chúng tôi = [email protected] r.nextInt res1: Int = 1825881164 r.nextInt(100) res2: Int = 99 r.nextFloat res3: Float = 0.10983747 Working of Scala Random with Examples

This function takes up the random function to generate numbers for processing; it generally uses the Linear congruential generator; this algorithm works on choosing the random number. We can also select the range over which we want to generate the number over. We will see the random number generation with some examples.

Example #1

Code:

val r = scala.util.Random r: chúng tôi = [email protected] r.nextInt res0: Int = 2123631858 r.nextInt res1: Int = -737405300 r.nextInt res2: Int = 377538368

Every Time the code is run or this function is called we will get the set of different values in the usual pattern without following any rule or pattern. Even we can also set an inclusive as well as an exclusive limit for the random number we want to generate.

Note: By default, the inclusive limit is 0 so we can also set only the exclusive one.

r.nextInt(100) res3: Int = 64 r.nextInt(100) res4: Int = 91 r.nextInt(100) res5: Int = 39 r.nextInt(100) res6: Int = 38

Output:

Example #2

We can also select the Random Float value by the method chúng tôi the range will lie from 0.0 decimal value to 1. Let us check that with some example:

Code:

r.nextFloat res8: Float = 0.59556204 r.nextFloat res9: Float = 0.8322488 r.nextFloat res10: Float = 0.6295014 r.nextFloat res11: Float = 0.69067985 r.nextFloat res12: Float = 0.7225474 r.nextFloat res13: Float = 0.9606658 r.nextFloat res14: Float = 0.77049905

Same as Float we can also create random numbers for Double Values.

r.nextDouble res18: Double = 0.34614360601266014 r.nextDouble res19: Double = 0.38648718502076507 r.nextDouble res20: Double = 0.31311541536121046 r.nextDouble res21: Double = 0.7410149595118738

It also prints the values between 0 to 1. The Boolean value can also use the same Random value and yields result based on Boolean Values.

r.nextBoolean res15: Boolean = true r.nextBoolean res16: Boolean = false r.nextBoolean res17: Boolean = false

Output:

Example #3

Code:

r.nextPrintableChar res24: Char = K r.nextPrintableChar res25: Char = g r.nextPrintableChar res26: Char = k r.nextPrintableChar res27: Char = K r.nextPrintableChar res28: Char = ' r.nextPrintableChar res29: Char = t

So it prints all the CharatcersRandomly. It is possible that the same character or integer value can come many times; there is no rule for the numbers not to be repeated.

Note: This Random function is widely used for Pattern Verification, security applications like Captcha, and other things.

Output:

Example #4

We can also use the Random function over a distribution. One known function that works with it is the Gaussian function. The Gaussian Function takes the Random data over the Gaussian Distribution and prints data accordingly. It returns a random number with a mean of 0 and a deviation of 1. To change this Gaussian value, we need to provide that explicitly.

Code:

r.nextGaussian res35: Double = 1.301074019733114 r.nextGaussian res36: Double = 0.37365693728172494 r.nextGaussian res37: Double = -0.2868649145689896 r.nextGaussian res38: Double = 2.108673488282321

Output:

This is what it generates randomly over a Gaussian Distribution.

Example #5

We can also merge random functions and create a List or store them in the collection we want. Let us check that with Example:

Code:

for(i<- 0 to r.nextInt(4)) yield r.nextDouble res40: scala.collection.immutable.IndexedSeq[Double] = Vector(0.020069508131527525) for(i<- 0 to r.nextInt(4)) yield r.nextDouble res41: scala.collection.immutable.IndexedSeq[Double] = Vector(0.6992494049547558) for(i<- 0 to r.nextInt(10)) yield r.nextDouble res42: scala.collection.immutable.IndexedSeq[Double] = Vector(0.9844960499444084, 0.06772285166187964, 0.9797605964534618, 0.6239437080597234, 0.015670036830630618, 0.8530556031658404) for(i<- 0 to r.nextInt(10)) yield r.nextDouble res43: scala.collection.immutable.IndexedSeq[Double] = Vector(0.0775137969760199, 0.3150585897780521, 0.5429361580144657, 0.7427799136029297, 0.7595647379710992, 0.6097524030728557, 0.5555829149364843, 0.031480808153179884, 0.9486129909099824, 0.1519146584718376) for(i<- 0 to r.nextInt(10)) yield r.nextPrintableChar res44: scala.collection.immutable.IndexedSeq[Char] = Vector(Q, q, n, ", [, r, K, 0, B) for(i<- 0 to r.nextInt(10)) yield r.nextPrintableChar res45: scala.collection.immutable.IndexedSeq[Char] = Vector(%, ?) for(i<- 0 to r.nextInt(10)) yield r.nextPrintableChar res46: scala.collection.immutable.IndexedSeq[Char] = Vector(m, =) for(i<- 0 to r.nextInt(3)) yield r.nextPrintableChar res47: scala.collection.immutable.IndexedSeq[Char] = Vector(6) for(i<- 0 to r.nextInt(10)) yield r.nextPrintableChar res48: scala.collection.immutable.IndexedSeq[Char] = Vector([, =, V, !, Q, f, 9, E)

Here we can see how we merged the different functions of Random and generated results accordingly.

Output:

As a result, this function is used to generate random values throughout the Scala application that may be required repeatedly.

Conclusion

From the above article, we saw how we could use the Scala Random function to generate random values and use it over the Scala Application. We also saw the various type by which we can create a random number. So it is a very good and important method used in Scala Programming for various Scala works.

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Working Of Kwargs In Python With Examples

Introduction to Python kwargs

In this article, we discuss the kwargs concept in Python. In Python, args is a variable with one star, which passes a variable number of the non-keyworded argument list, whereas kwargs have two stars that pass a variable number of the keyworded argument list to the function. These *args and **kwargs make the function flexible. In Python, we use kwargs, which are keyword arguments used when we provide a name to a variable as we pass it to the function. We use kwargs when we want to handle named arguments with a variable-length argument dictionary in a function.

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Working with kwargs in Python with examples

In this section, when we are unsure how many arguments are needed in the program, we use kwargs with two stars (**) before the parameter name. In Python, when using kwargs, we declare it with two stars (**). Now let us see the demonstration of kwargs in the below example.

Example #1

Code:

print("Program to demonstrate **kwargs for variable number of keywords:") print("n") def concatenate(**kwargs): r = "" for arg in kwargs.values(): r += arg return r print("The concatenated value is displayed as follows:") print(concatenate(a="Educba", b="Training", c="Institue"))

Output:

In the above program, we can see that we have defined a function using the argument variable as kwargs with two stars before it. So when we call this function to concatenate(), which will iterate through the given kwargs dictionary a= “Educba”, b= “Training”, c= “Institue” using “for” loop. Then it prints all these words together, as shown in the output and screenshot above.

Now we will see another use of **kwargs. Let’s see below a function that creates using a dictionary of names.

Example #2

Code:

print("Another use of **kwargs:") print("n") def print_values(**kwargs): for key, value in kwargs.items(): print("The value of {} is {}".format(key, value)) print_values(my_name="Rahul", your_name="Ratan")

Output:

In the above program, we have created a dictionary using **kwargs. As we know dictionary can be unordered; the output might display the name first “Rahul” or with another name, “Ratan” so the dictionary has no order to display the output. This can be seen in the above screenshot.

In Python, the known value within the argument list will remain small whenever the developers or users need a number of inputs without a fix. Let us see below how *args and *kwargs are used. Let us demonstrate below with examples.

Example #3

Below is the program that uses *args to pass the elements to the function in an iterable variable.

Code:

print("Program to demonstrate the *args is as follows:") def func(a, b, c): print(a, b, c) a = [1,2,3] func(*a)

Output:

This program utilizes *args to break the list “a” into three elements. We should also note that the above program works only when the number of parameters of a function is the same as the number of elements in the given iterable variable (here, it is list “a”).

Example #4

Code:

print("Program to demonstrate the **kwargs used in function call is as follows:") def func(a, b, c): print(a, b, c) a = {'a': "one", 'b': "two", 'c': "three" } func(**a)

Output:

In the above program, we are using **kwargs with the name variable as “a” which is a list. Again the above program to work, we need to note that the name of the parameters passed to the function must also have the same name in the dictionary where these act as the keys. And we should also note that the number of arguments should be the same as the number of keys in the dictionary.

In the above section, we observed that args, which employs a single star (), generates the list containing positional arguments defined from the provided function call. Whereas we saw in the above **kwargs, which has a double star (**) which creates a dictionary with keys as each element whose contents can be keyword arguments after those defined from the function call. Hence *args and **kwargs are standard conventions to catch positional and keyword arguments, respectively. We should also note that when we use these two types of arguments in one function, we cannot place or write **kwargs before *args, or we will receive an error.

Conclusion

This article concludes that **kwargs is a keyword argument length list when creating the function with parameters. In this, we saw simple examples of **kwargs. We also saw the use of **kwargs when we were unsure of how many parameters to use we can use kwargs. Then we also saw the difference between *args and **kwargs and how they are used in the function call. In this article, we also saw some important notes to remember, such as we need to pass the same number of arguments with the same number of elements when calling the function. We also saw **kwargs creates a dictionary that displays an unordered element when executed.

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Explain The Architecture Of Java Swing In Java?

Java Swing is a set of APIs that provides a graphical user interface (GUI) for the java programs. The Java Swing was developed based on earlier APIs called Abstract Windows Toolkit (AWT). The Java Swing provides richer and more sophisticated GUI components than AWT. The GUI components are ranging from a simple level to complex tree and table. The Java Swing provides the pluggable look and feels to allow look and feel of Java programs independent from the underlying platform.

Features of Java Swing

The Java Swing is platform independent and follows the MVC (Model View and Controller) framework.

Pluggable look and feel − The Java Swing supports several looks and feels and currently supports Windows, UNIX, Motif, and native Java metal look and feel and allows users to switch look and feel at runtime without restarting the application. By doing this, users can make their own choice to choose which look and feel is the best for them instantly.

Lightweight components − All Java swing components are lightweight except for some top-level containers. A Lightweight means component renders or paints itself using drawing primitives of the Graphics object instead of relying on the host operating system (OS). As a result, the application presentation is rendered faster and consumed less memory than previous Java GUI applications like AWT.

Simplified MVC − The Java Swing uses a simplified Model-View-Controller architecture (MVC) as the core design behind each of its components called the model-delegate. Based on this architecture, each Java Swing component contains a model and a UI delegate and wraps a view and a controller in MVC architecture. The UI delegate is responsible for painting screen and handling GUI events. Model is in charge of maintaining information or states of the component.

Example import javax.swing.*; import java.awt.*; import java.awt.event.*; class Model { private int x; public Model() { x = 0; } public Model(int x) { this.x = x; } public void setX(){ x++; } public int getX() { return x; } } class View { private JFrame frame; private JLabel label; private JButton button; public View(String text) { frame = new JFrame("View"); frame.getContentPane().setLayout(new BorderLayout()); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(200,200); frame.setVisible(true); label = new JLabel(text); frame.getContentPane().add(label, BorderLayout.CENTER); button = new JButton("Button"); frame.getContentPane().add(button, BorderLayout.SOUTH); } public JButton getButton() { return button; } public void setText(String text) { label.setText(text); } } class Controller { private Model model; private View view; private ActionListener actionListener; public Controller(Model model, View view) { this.model = model; chúng tôi = view; } public void contol() { actionListener = new ActionListener() { public void actionPerformed(ActionEvent actionEvent) { linkBtnAndLabel(); } }; view.getButton().addActionListener(actionListener); } private void linkBtnAndLabel() { model.setX(); view.setText(Integer.toString(model.getX())); } } public class Main { public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { @Override public void run() { try { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); } catch (Exception ex) { } Model model = new Model(0); View view = new View("-"); Controller controller = new Controller(model,view); controller.contol(); } }); }

Directplay Windows 10 Issues: Fix Them With These 4 Methods

DirectPlay Windows 10 Issues: Fix Them With These 4 Methods First install the DirectPlay feature

If you’re a fan of older Windows games, you might encounter errors when playing on Windows 10.

The most common one is related to the DirectPlay component, and installing this feature may be the best solution.

INSTALL BY CLICKING THE DOWNLOAD FILE

To fix Windows PC system issues, you will need a dedicated tool

Fortect is a tool that does not simply cleans up your PC, but has a repository with several millions of Windows System files stored in their initial version. When your PC encounters a problem, Fortect will fix it for you, by replacing bad files with fresh versions. To fix your current PC issue, here are the steps you need to take:

Download Fortect and install it on your PC.

Start the tool’s scanning process to look for corrupt files that are the source of your problem

Fortect has been downloaded by

readers this month.

Let us consider DirectPlay in Windows 10.

But first, what is DirectPlay? DirectPlay is an antiquated API library component of earlier DirectX versions. However, Microsoft sidelined DirectPlay in favor of Games for Windows Live. As DirectPlay is obsolete, it’s no longer required to update Windows games.

However, DirectPlay is still essential to run games that predate 2008 in Windows 10. Consequently, some older games don’t run without DirectPlay.

If a game or app needs DirectPlay, a window opens stating An app on your PC needs the following Windows feature DirectPlay.

Are you getting that DirectPlay error in Windows 10? If so, this is how you can enable DirectPlay.

What causes DirectPlay issues?

Like many other computer-related issues, this problem may be caused by varying elements. At the top of this list, we have the following:

OS update problems – A major cause is failed Windows Updates for many users.

Windows component issues – Users who have something corrupting the Windows Component Store can expect this error or other errors.

Antivirus software – Sometimes, the error will be triggered because of compatibility issues with the antivirus software you use.

With these triggers in mind, we will introduce you to some good solutions.

How can I fix DirectPlay problems on Windows 10? 1. Installing DirectPlay 2. Adjust your antivirus software

Expert tip:

If that’s the case, antivirus software might be blocking DirectPlay. First, try temporarily switching your antivirus software off, which you can usually do via antivirus utilities’ system tray icon context menus.

However, keep in mind that antivirus developers have strived to comply with the requirements of various activity modes users might need in the past years. Consequently, a lot of antivirus tools nowadays come with gaming compatibility modes.

So if you need to change your antivirus for more valuable gaming modes, we recommend the most effective antivirus for Windows 10 now that will adjust your gameplay.

3. Run the game in Compatibility Mode

The Compatibility mode setting can come in handy for running older games in Windows. It will enable the game to utilize settings from a previous Windows OS.

4. Use the Program Compatibility Troubleshooter

So that’s how you can enable DirectPlay in Windows 10 and select the Compatibility mode setting to kick-start games that predate the more recent Windows platforms.

You might also need to enable DirectPlay for some retro game emulators.

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