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 โ˜•What is the canonical constructor of a Java record?


ยท java

In Java, a record is a new type ๐Ÿ†• of class that was introduced in Java 16. A record is a concise way to declare a class that is primarily used to store data ๐Ÿ’พ, similar to a struct in other programming languages.

When you define a record class in Java, the compiler automatically โš™๏ธ generates a canonical constructor for the record. The canonical constructor is a constructor that takes all the record's components as parameters and assigns them to the corresponding instance variables.

For example, suppose you have a record class called Person with two components, name, and age. The canonical constructor for this record would look like this:

๐’‘๐’–๐’ƒ๐’๐’Š๐’„ ๐‘ท๐’†๐’“๐’”๐’๐’(๐‘บ๐’•๐’“๐’Š๐’๐’ˆ ๐’๐’‚๐’Ž๐’†, ๐’Š๐’๐’• ๐’‚๐’ˆ๐’†) {

๐’•๐’‰๐’Š๐’”.๐’๐’‚๐’Ž๐’† = ๐’๐’‚๐’Ž๐’†;
๐’•๐’‰๐’Š๐’”.๐’‚๐’ˆ๐’† = ๐’‚๐’ˆ๐’†;


๐Ÿ’ก Note that the canonical constructor is automatically generated by the Java compiler, so you do not need to explicitly define it in your code.

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