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What is getInstance in Java?

The getInstance(Locale locale) is the method of Java Currency class which is used to get an instance of currency for the given country. Because countries change their currencies, the result may vary over time.

What is true about class getInstance () in Java?

What is true about Class. getInstance()? Explanation: Class class provides list of methods for use like getInstance().

Why is getInstance static?

for a singleton pattern, getInstance IS a static method, and uses static attrs. The whole point of static is to have things associated with the class instead of a specific object. The singleton pattern guarantees that you will have one instance of an object of that type.

How do I use Calendar getInstance?

What is the use of getInstance method?

The getInstance() method of java. security. Provider class is used to return a Signature object that implements the specified signature algorithm. This method traverses the list of registered security Providers, starting with the most preferred Provider.

What is the difference between getInstance and new?

getInstance is the static method often used with the Singleton Pattern in Java. The new keyword actually creates a new object. At some point there must be a new (although there are a few other methods to instantiate new objects) to actually create the object that getInstance returns.

How many subclasses can a superclass have?

There is no limitation to how many subclasses a superclass can have. Likewise, there isn’t a limitation on the number of levels of inheritance. A hierarchy of classes can be built upon a certain area of commonality. In Java, when a subclass inherits from a superclass, it’s known as “extending” the superclass.

What is garbage collection in the context of Java?

Java garbage collection is the process by which Java programs perform automatic memory management. Java programs compile to bytecode that can be run on a Java Virtual Machine, or JVM for short. When Java programs run on the JVM, objects are created on the heap, which is a portion of memory dedicated to the program.

Why do we use static constructor?

A static constructor is used to initialize any static data, or to perform a particular action that needs to be performed only once. It is called automatically before the first instance is created or any static members are referenced.

Are singletons thread safe?

Is singleton thread safe? A singleton class itself is not thread safe. Multiple threads can access the singleton same time and create multiple objects, violating the singleton concept. The singleton may also return a reference to a partially initialized object.

Is a static class a singleton?

A Singleton can implement interfaces, inherit from other classes and allow inheritance. While a static class cannot inherit their instance members. So Singleton is more flexible than static classes and can maintain state. A Singleton can be initialized lazily or asynchronously and loaded automatically by the .

Should singleton methods be static?

A singleton doesn’t use static methods, so you won’t have trouble using it in a non-static context. Singletons can be extended/subclassed. Since they’re objects, they can be injected into other objects, which allow for the creation of some great design patterns utilizing the concepts of dependency injection.

What is getInstance () and getTime () in calendar class?

getInstance(). getTime() : Returns a Date object representing this Calendar’s time value (millisecond offset from the Epoch(January 1, 1970 00:00:00.000 GMT (Gregorian).) “). new Date() : internally uses System.

How do you program a calendar in Java?

How can I compare two dates in Java?

In Java, two dates can be compared using the compareTo() method of Comparable interface. This method returns ‘0’ if both the dates are equal, it returns a value “greater than 0” if date1 is after date2 and it returns a value “less than 0” if date1 is before date2.

What is Calendar class in Java?

Calendar class in Java is an abstract class that provides methods for converting date between a specific instant in time and a set of calendar fields such as MONTH, YEAR, HOUR, etc. It inherits Object class and implements the Comparable, Serializable, Cloneable interfaces.

What is getMessage () in Java?

The getMessage() method of Throwable class is used to return a detailed message of the Throwable object which can also be null. One can use this method to get the detail message of exception as a string value. Syntax: public String getMessage()

What is a singleton in Java?

In Java, Singleton is a design pattern that ensures that a class can only have one object. To create a singleton class, a class must implement the following properties: Create a private constructor of the class to restrict object creation outside of the class.

What is Java locale?

A Locale object represents a specific geographical, political, or cultural region. An operation that requires a Locale to perform its task is called locale-sensitive and uses the Locale to tailor information for the user.

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Object Instance Methods | Java | Tutorial 30

Object Instance Methods | Java | Tutorial 30

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Java Signature getInstance() method with Examples – GeeksforGeeks

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design patterns – Java: getInstance vs Static – Stack Overflow

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Java Currency getInstance() Method – Javatpoint

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design patterns – Java: getInstance vs Static – Stack Overflow

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[PHP] Phương thức getInstance() là gì và tại sao dùng getInstance(); – MegaCode

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public static Currency getInstance(Locale locale)

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Java Signature getInstance() method

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Java Signature getInstance() method with Examples

getInstance(String algorithm)

The getInstance() method of java.security.Provider class is used to return a Signature object that implements the specified signature algorithm.

This method traverses the list of registered security Providers, starting with the most preferred Provider. A new Signature object encapsulating the SignatureSpi implementation from the first Provider that supports the specified algorithm is returned.

Syntax:

public static Signature getInstance(String algorithm) throws NoSuchAlgorithmException

Parameters: This method takes the standard name of Algorithm as a parameter.

Return Value: This method returns the new Signature object.

Exception: This method throws NoSuchAlgorithmException if no Provider supports a Signature implementation for the specified algorithm.

Below are the examples to illustrate the getInstance() method:

Example 1:

Java

import java.security.*; import java.util.*; public class GFG1 { public static void main(String[] argv) { try { Signature sr = Signature.getInstance( “SHA1WithRSA” ); String str = sr.toString(); System.out.println( “Status : ” + str); } catch (NoSuchAlgorithmException e) { System.out.println( “Exception thrown : ” + e); } catch (ProviderException e) { System.out.println( “Exception thrown : ” + e); } } }

Output: Status : Signature object: SHA1WithRSA

Example 2: To show NoSuchAlgorithmException

Java

import java.security.*; import java.util.*; public class GFG1 { public static void main(String[] argv) { try { System.out.println( “Trying to get the instance of unknown instance” ); Signature sr = Signature.getInstance( “TAJMAHAL” ); String str = sr.toString(); System.out.println( “Status : ” + str); } catch (NoSuchAlgorithmException e) { System.out.println( “Exception thrown : ” + e); } catch (ProviderException e) { System.out.println( “Exception thrown : ” + e); } } }

Output: Trying to get the instance of unknown instance Exception thrown : java.security.NoSuchAlgorithmException: TAJMAHAL Signature not available

Signature getInstance(String algorithm, Provider provider)

The getInstance() method of java.security.Provider class is used to Returns a Signature object that implements the specified signature algorithm.

A new Signature object encapsulating the SignatureSpi implementation from the specified Provider object is returned. Note that the specified Provider object does not have to be registered in the provider list.

Syntax:

public static Signature getInstance(String algorithm, Provider provider) throws NoSuchAlgorithmException

Parameters: This method takes the following arguments as a parameters:

algorithm – the name of the algorithm requested.

– the name of the algorithm requested. provider– the provider

Return Value: This method returns the new Signature object.

Exception: This method throws following exceptions:

NoSuchAlgorithmException – if a SignatureSpi implementation for the specified algorithm is not available from the specified Provider object.

– if a SignatureSpi implementation for the specified algorithm is not available from the specified Provider object. IllegalArgumentException– if the provider is null.

Below are the examples to illustrate the getInstance() method:

Example 1:

Java

import java.security.*; import java.util.*; public class GFG1 { public static void main(String[] argv) { try { Signature sr = Signature.getInstance( “SHA1WithRSA” ); Provider pd = sr.getProvider(); String algo = sr.getAlgorithm(); Signature sr1 = Signature.getInstance(algo, pd); String str = sr1.toString(); System.out.println( “Status : ” + str); } catch (NoSuchAlgorithmException e) { System.out.println( “Exception thrown : ” + e); } catch (ProviderException e) { System.out.println( “Exception thrown : ” + e); } } }

Output: Status : Signature object: SHA1WithRSA

Example 2: To show NoSuchAlgorithmException

Java

import java.security.*; import java.util.*; public class GFG1 { public static void main(String[] argv) { try { Signature sr = Signature.getInstance( “SHA1WithRSA” ); Provider pd = sr.getProvider(); String algo = sr.getAlgorithm(); Signature sr1 = Signature.getInstance( “TAJMAHAL” , pd); String str = sr1.toString(); System.out.println( “Status : ” + str); } catch (NoSuchAlgorithmException e) { System.out.println( “Exception thrown : ” + e); } catch (ProviderException e) { System.out.println( “Exception thrown : ” + e); } } }

Output: Exception thrown : java.security.NoSuchAlgorithmException: no such algorithm: TAJMAHAL for provider SunRsaSign

Example 3: To show IllegalArgumentException

Java

import java.security.*; import java.util.*; public class GFG1 { public static void main(String[] argv) { try { Signature sr = Signature.getInstance( “SHA1WithRSA” ); Provider pd = null ; String algo = sr.getAlgorithm(); Signature sr1 = Signature.getInstance(algo, pd); String str = sr1.toString(); System.out.println( “Status : ” + str); } catch (NoSuchAlgorithmException e) { System.out.println( “Exception thrown : ” + e); } catch (ProviderException e) { System.out.println( “Exception thrown : ” + e); } catch (IllegalArgumentException e) { System.out.println( “Exception thrown : ” + e); } } }

Output: Exception thrown : java.lang.IllegalArgumentException: missing provider

Java: getInstance vs Static

What is the purpose of getInstance() in Java?

During my research I keep reading that getInstance() helps achieve a Singleton design pattern (which means just one instance across the whole program to my understanding). But can’t I just use static? Isn’t that the whole point of static?

If I were to just have static methods and fields, how would it differ from using getInstance() ? Is there a “scope” of static? For example, one instance per method or class?

And if they are different, in what cases would I choose getInstance() over using static?

I apologize if the question is unclear, I am sure I am missing something on the subject matter, I just can’t figure out what.

Thank you for any and all advice.

Java Currency getInstance() Method

next → ← prev Java Currency getInstance() Method There are two types of getIsntance methods. Java Currency getInstance(Loacale locale) Method The getInstance(Locale locale) is the method of Java Currency class which is used to get an instance of currency for the given country. Because countries change their currencies, the result may vary over time. Syntax Following is the declaration of getInstance() method: public static Currency getInstance(Locale locale) Parameter DataType Parameter Description NA Locale For whose country a currency code is needed. Returns This method will return the instance of Currency for the given locale of country, or it will return null. Exceptions NullPointerException – If locale or currencyCode is null. IllegalArgumentException ? If the country of locale is not a supported ISO 3166 country code. Compatibility Version Java 1.4 and above Example 1 import java.util.*; public class CurrencyGetInstanceLocaleExample1 { public static void main(String args[]) { Locale locale = Locale.GERMANY; //create an instance of currency with tha given locale Currency c = Currency.getInstance(locale); // print currency code System.out.println(”

Currency code of given locale: ” + c.getCurrencyCode()); } } Test it Now Output: Currency code of given locale: EUR Example 2 import java.util.*; public class CurrencyGetCurrencyCodeLocaleExample2 { public static void main(String[] args) { Currency k = Currency.getInstance(Locale.UK); System.out.println(“Currency code UK = ” + k.getCurrencyCode()); Currency u = Currency.getInstance(Locale.US); System.out.println(“Currency code US = ” + u.getCurrencyCode()); } } Test it Now Output: Currency code UK = GBP Currency code US = USD Example 3 import java.util.Currency; import java.util.Locale; class Account { private Locale locale; private Currency c; public Account(Locale locale) { this.locale = locale; this.c = Currency.getInstance(locale); } public Locale getLocale() { return this.locale; } public void status() { System.out.println(“Currency code is: “+ c.getCurrencyCode()); } } public class CurrencyGetCurrencyCodeLocaleExample3{ public static void main(String[] args) { Account ac = new Account (Locale.FRANCE); ac.status(); } } Test it Now Output: Currency code is: EUR Example 4 import java.util.Currency; import java.util.Locale; public class CurrencyGetInstanceLocaleExample4 { public static void main(String[] args) { // Indian Currency System.out.println(”

———Indian Currency———-

“); Locale in = new Locale(” “, “IN”); showCurrencyInfo(in); } private static void showCurrencyInfo(Locale locale) { Currency currency = Currency.getInstance(locale); System.out.println(“Currency display name : ” + currency.getDisplayName()); System.out.println(“Currency Code : ” + currency.getCurrencyCode()); System.out.println(“Currency Numeric Code : ” + currency.getNumericCode()); } } Test it Now Output: ———Indian Currency———- Currency display name : Indian Rupee Currency Code : INR Currency Numeric Code : 356 Java Currency getInstance(String currencyCode) Method The getInstance() is the method of Java Currency class which is used to get an instance of currency for the given currency code. Syntax Following is the declaration of getInstance(String currencyCode) method: public static Currency getInstance(String currencyCode) Parameter DataType Parameter Description String currencyCode The ISO 4217 code of the currency. Returns This method returns the instance of currency for the given currency code. Exceptions NullPointerException – If currencyCode is null. IllegalArgumentException – If currencyCode is not a supported ISO 4216 code. Compatibility Version Java 1.4 and above Example 1 import java.util.Currency; import java.util.Locale; public class CurrencyGetInstanceCurrencyCodeExample1 { public static void main(String[] args) { //create an instance of currency with given currencyCode Currency currency = Currency.getInstance(“INR”); // prints the currency of given code System.out.println(currency.getDisplayName()); } } Test it Now Output: Indian Rupee Example 2 import java.util.Currency; public class CurrencyGetInstanceCurrencyCodeExample2 { public static void main(String[] args) { Currency us = Currency.getInstance(“USD”); System.out.println(“Currency code of US: ” + us); System.out.println(“Currency name of US: ” +us.getDisplayName()); } } Test it Now Output: Currency code of US: USD Currency name of US: US Dollar Example 3 import java.util.Currency; import java.util.Scanner; public class CurrencyGetInstanceCurrencyCodeExample3 { public static void main(String[] args) { Scanner sc = new Scanner(System.in); System.out.print(“Enter the currency name: “); String name=sc.next(); Currency currency = Currency.getInstance(name); System.out.println(“Currency is: “+ currency.getDisplayName()); } } Output: Enter the Currency name: INR Currency is: Indian Rupee Example 4 import java.util.Currency; public class CurrencyGetInstanceCurrencyCodeExample4 { public static void main(String[] args) { System.out.println(”

———Indian Currency———-

“); Currency in = Currency.getInstance(“INR”); System.out.println(“Currency display name: ” + in.getDisplayName()); System.out.println(“Currency Code: ” + in.getCurrencyCode()); System.out.println(“Currency Numeric Code: ” + in.getNumericCode()); } } Test it Now Output: ———Indian Currency———- Currency display name: Indian Rupee Currency Code: INR Currency Numeric Code: 356 Next Topic Java Currency

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