CompareTo method does have an implementation. The method is implemented in all the classes such as Integer, Double etc. In your case you are using String’s compareTo method. If you want it to be customized as per your class, you do so by overriding the compareTo method. 1 solved how comparable interface return int value, … Read more
No doubt your code works even without the interface at this moment, but. Implementing an interface allows a class to become more formal about the behavior it promises to provide. Interfaces form a contract between the class and the outside world, and this contract is enforced at build time by the compiler. If your class … Read more
A few points to consider: Interfaces didn’t have default methods until Java 8. That a in your interface is implicitly final. Interfaces can’t define public mutable fields. Interfaces can’t define private (or protected, or package) fields. Interfaces can’t have protected or package methods; they couldn’t have private methods until Java 9. Abstract classes don’t have … Read more
Java supports multiple implementation of interfaces. The proper syntax is: public class A implements B, C{ } 0 solved Implement interfaces in java
The type of a variable and the type of the object the variable refers to do not need to be the same, so long as the type of the object is compatible with the type of the variable. So what does it mean to be compatible? It means that the object’s type has an “is … Read more
Interfaces let you define methods that will be common to a group of classes. The implementation of the interface can be different for each class, and it’s up to those classes to independently implement what that methods do. interface Animal { // Define the interface Boolean canBite(); } class Dog implements Animal { // Define … Read more
There are several concrete classes that implement the List interface in the java.util package. Looking at List‘s javadoc lists a few of them under the “All Known Implementing Classes” heading. You’ll find the implementations there. solved Where can we find the definition of methods present in the interfaces given by java.util package
Actually, the iPhone 3GS’ BCM4325 chip for bluetooth&wifi has FM radio capabilities. there actually is a guide that describes the basic but nobody has so far created an app (and required drivers, OS add ons, …). http://theiphonewiki.com/wiki/index.php?title=BCM4325 1 solved Is there public iOS software interface for iPhone’s FM Radio chip?
JLS 15.20.2 states: If a cast of the RelationalExpression to the ReferenceType would be rejected as a compile-time error (ยง15.16), then the instanceof relational expression likewise produces a compile-time error. In such a situation, the result of the instanceof expression could never be true. In this case (Intf) obj is not a compile time error … Read more
The problem is that the compiler tells me that he “cannot resolve the method beStored(int). That simply means that you’re attempting to pass an int type to the beStored method. If you look at the interface definition of this method again you’ll notice that you’re not obeying the contract that has been set. public void … Read more
That’s the definition of an abstract class. You cannot create an instance of it, only a type derived from it. Think of something like a fruit. You cannot have a fruit sitting on the table. It must be a certain type of fruit, such as an orange or an apple. In this case, fruit would … Read more
From a programming perspective, there isn’t really anything wrong with the code. I guess what your teacher was getting at is that Fluffy should be an interface and Animal should be the abstract class, but that’s more a design issue than a code issue. You can probably come up with arguments for either side, using … Read more
you are throwing an NotInprementedException on the setter of the property. if you want automatic properties replace get { throw new NotImplementedException(); } set { throw new NotImplementedException(); } with get; set; 1 solved implementing a c# interface [closed]
Does Java 8 specification allow to use interface reference type variable on objects that don’t use the implements keyword explicitly? [closed] solved Does Java 8 specification allow to use interface reference type variable on objects that don’t use the implements keyword explicitly? [closed]
https://www.tutorialspoint.com/typescript/typescript_interfaces.html is also a good read. Basically, what I understand about Interface is, it defines properties,methods for the members. And this can be used to reuse the content any number of times. solved Interface in TypeScript’s latest version