Java 15 - Record

Java 14 introduces a new class type record as preview feature to facilitate creation of immutable data objects. Java 15 enhances record type further. It is still a preview feature.

  • Record object have implicit constructor with all the parameters as field variables.

  • Record object have implicit field getter methods for each field variables.

  • Record object have implicit field setter methods for each field variables.

  • Record object have implicit sensible implementation of hashCode(), equals() and toString() methods.

  • With Java 15, native methods cannot be declared in records.

  • With Java 15, implicit fields of record are not final and modification using reflection will throw IllegalAccessException.

Example

Consider the following example −

ApiTester.java

public class APITester {
   public static void main(String[] args) {
      StudentRecord student = new StudentRecord (1, "Julie", "Red", "VI", 12);
      System.out.println(student.id());
      System.out.println(student.name());
      System.out.println(student);
   }
}
record StudentRecord(int id, 
   String name, 
   String section, 
   String className,
   int age){}

Compile and Run the program

$javac -Xlint:preview --enable-preview -source 15 APITester.java
$java --enable-preview APITester

Output

1
Julie
StudentRecord[id=1, name=Julie, section=Red, className=VI, age=12]
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