interface

[Solved] What to do when no base class exists to a certain common interface in Java Swing

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You can use the interface and create wrappers for each component type you need. JTextFieldSupportWrapper and JComboboxSupportWrapper both taking an instance of the wrapped object type and and delegating to the addActionListener methods. abstract class ActionListenerSupportWrapper<T extends JComponent> implements ActionListenerSupport { protected final T comp; protected ActionListenerSupportWrapper(T comp) { this.comp = comp; } } // … Read more

[Solved] Interface vs Abstract Class (general OO)

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While your question indicates it’s for “general OO”, it really seems to be focusing on .NET use of these terms. In .NET (similar for Java): interfaces can have no state or implementation a class that implements an interface must provide an implementation of all the methods of that interface abstract classes may contain state (data … Read more

[Solved] Generic Binary Tree Java

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Well, there are quite a number of syntax errors: public class Node <T> implements NodeActionInterface { // <T> data; T data; // ^ T is the data type… Node<T> leftTree; Node<T> rightTree; // ^ not really an errror, but you should use the generic here //public <T> Node(<T> data) public Node(T data) // ^ declared … Read more

[Solved] How can I create a SIP connecton using Liblinphone interface class?

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Absolutely an interface cannot be initialized. Because it has no method implementation. It’s not a class! I should use classes that implement these methods. In fact I should use org.linphone.core (Library) instead of LinphoneCore (Intreface) solved How can I create a SIP connecton using Liblinphone interface class?

[Solved] Switch with specific type in TypeScript not working

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Just replace your object with an enum, that’s what they’re for: export enum APP_STATUS { CONFIRMED, INCONSISTENCIES, SUCCESS, ERROR, LOADING, OK, } export interface Inconsistency {}; export interface InconsistenciesLoading { type: APP_STATUS.LOADING; } export interface InconsistenciesError { type: APP_STATUS.ERROR; } export interface InconsistenciesSuccess { type: APP_STATUS.SUCCESS; } export interface InconsistenciesData { type: APP_STATUS.INCONSISTENCIES; data: Inconsistency[]; … Read more

[Solved] Why do we need fields in Interfaces in java? Where do we use these static final fields?

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I actually think of them as “constants” (static final does not directly imply a constant for any Type in Java), say i have a enum like this: public enum ModeEnum { FAIL_FAST, FAIL_RETRY, HUNDRET_MORE_MODES } And a Interface like this: public interface ISample { static final ModeEnum DEFAULT_MODE = ModeEnum.FAIL_FAST; public void process(ModeEnum mode); } … Read more

[Solved] C# parameters in interface [closed]

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Interfaces are used as a contract for classes that inherit it. This means any public methods/properties you want the interface to expose, must also be exposed in the inherited class. In the case above, you don’t have any public methods/properties exposed in the interface. Let me show you an example. Interface ITest { void AddPerson(string … Read more

[Solved] When should you make an interface/contract, and when not? [closed]

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Interfaces are public “contracts” whenever you want to be able to swap the implementation or give someone the flexibility to use another implementation you should use interfaces. Example: You want to store something so you can load it later. You could use something like public function save(MySQL $db, array $data); But this is not very … Read more

[Solved] asp.net web api c# interface dataprovider

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In your interface you have it defined as Task<IEnumerable<TabMain>> Gettabs(); but you implement it like this public async Task<IEnumerable<TabMain>> GetTabs() C# is a case sensitive language, so you need to either change your implementation method name or your interface method name. I would change the interface method name to GetTabs to go with the standard … Read more

[Solved] Implementation doesn’t match interface

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In the interface the read method returns an interface{} whereas the CapacityResponse returns an int32. Go’s interface matching is done strictly on the signature of the function and does not take into consideration that an int32 does implement the interface{}. You can work around this by having two methods: // This does the work func … Read more

[Solved] Getters and Setters with interfaces has a parameter

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The same way you deal with the regular fields in class: Assumingv you have scoreStrategy and testStatistics fields: public void setScoreStrategy(IScoreStrategy iScoreStrategy) { this.scoreStrategy = scoreStrategy; } public IScoreStrategy getScoreStrategy() { return scoreStrategy; } public ITestStatistics getTestStatistics() { return testStatistics; } // … 1 solved Getters and Setters with interfaces has a parameter