Java record İle Yapılamayacak Şeyler

1. Records Cannot Extend Another Class

2. Records Cannot Be Extended

Örnek

Şu kod derlenmez

public class PremiumRecord extends InsuranceRecord {…}

3. Records Cannot Have Additional Instance Fields

Örnek

Şu kod derlenmez

public record InsuranceRecord(String type, float premium) {
  private String policyNumber;  // This won't compile
}

4. Private Canonical Constructors Are Not Allowed

Örnek

Şu kod derlenmez

public record InsuranceRecord(String type, float premium) {
  private InsuranceRecord(String type, float premium) {
    this.type = type;
    this.premium = premium;
  }
  public static InsuranceRecord newInstance(String type, float premium) {
    return new InsuranceRecord(type, premium);
  }
}

5.  Records Cannot Have Setters

Örnek

Şu kod derlenmez

public record InsuranceRecord(String type, float premium) {
  public void setType(String type) {
    this.type = type;  // Won't compile
  }
}