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Vous devez développer une classe pour laquelle il ne doit exister qu’une et une seule instance dans toute votre application. Quel est le design-pattern à retenir pour cela ?
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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);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);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?4
Which design pattern allows to dynamically add responsibilities to an object?4
Can an interface inherit from another interface?8
Can we extend an abstract class in Java?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);