Hard
Given a class A that implements a method to record the values of the class members in a database. Given a class A1 that inherits from A and a class A2 that also inherits from A.
You must develop as quickly as possible, and with the least code possible, a program that allows the recording of the data of an instance A, an instance A1 or an instance A2 in a database. How will you proceed? (two choices required)
Author: Eric HostaleryStatus: PublishedQuestion passed 1419 times
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Which design pattern allows to dynamically add responsibilities to an object?5
Is the following code valid?
class Person {
constructor(name, age) {
this.name = name;
this.age = age;
}
}
const person = new Person('John', 20);
console.log(person.name);
console.log(person.age);14
Is the following code valid?
class Person {
constructor(name, age) {
this.name = name;
this.age = age;
}
}
const person = new Person('John', 20);
console.log(person.name);
console.log(person.age);4
Is the following code valid?
class Person {
constructor(name, age) {
this.name = name;
this.age = age;
}
}
const person = new Person('John', 20);
console.log(person.name);
console.log(person.age);9
You need to develop a class for which there should be only one instance throughout your application. Which design pattern should you use for this?8
Can we extend an abstract class in Java?4
Can an interface inherit from another interface?