What is @AllArgsConstructor used for?

@AllArgsConstructor generates a constructor that takes one parameter for every field in the class, in the order the fields are declared — a quick way to get a fully-populating constructor without writing it by hand.

@AllArgsConstructor
public class Person {
    private String name;
    private int age;
}
//  generates: public Person(String name, int age) { this.name = name; this.age = age; }

It's often combined with @Builder so the builder has a full constructor to delegate to, or with @NoArgsConstructor so the class supports both a default constructor (for frameworks) and a fully-populating one (for application code), covering both use cases with two short annotations instead of two hand-written constructors.

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