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Other 2021-10-26 08:47:13
abstract class
Sometimes we may come across a situation where we cannot provide implementation to all the methods in a class. We want to leave the implementation to a class that extends it. In such case we declare a class as abstract.To make a class abstract we use ke... Add solution -
Other 2021-10-26 08:46:13
can we have abstract class having no abstract method in java?
abstract class AbstractDemo { // Abstract class private int i = 0; public void display() { // non-abstract method System.out.print("Welcome to Tutorials Point"); } } public class InheritedClassDemo extends AbstractDemo { public... Add solution -
Kotlin 2021-10-24 22:37:10
Room kotlin
// Annotates class to be a Room Database with a table (entity) of the Word class @Database(entities = arrayOf(Word::class), version = 1, exportSchema = false) public abstract class WordRoomDatabase : RoomDatabase() { abstract fun wordDao(): WordDao ... Add solution -
Java 2021-10-24 21:22:13
class is abstract cannot be instantiated
An abstract class is a class that is declared abstract —it may or may not include abstract methods. Abstract classes cannot be instantiated, but they can be subclassed. When an abstract class is subclassed, the subclass usually provides implement... Add solution -
Other 2021-10-23 02:27:13
room database implementation android
@Database(entities = { Note.class }, version = 1) public abstract class NoteDatabase extends RoomDatabase { public abstract NoteDao getNoteDao(); private static NoteDatabase noteDB; public static NoteDatabase getInstance(Context context) { if (null == ... Add solution -
Java 2021-10-20 13:42:08
how to use an abstract class in java
interface methods{ public void hey(); public void bye(); } //unable to implement all the abstract methods in the interface so // the other class automatically becomes abstract abstract class other implements methods{ public void hey(){ ... Add solution -
Java 2021-10-17 21:53:05
abstraction example in java
bstraction: Hiding the implementation details, concentrating on essentials things, without worrying about the details ■ In java, abstraction is achieved via abstract class or interface ■ Abstraction cannot exist without inheritance 3.1. Abstract cla... Add solution