Records in Java

A whole value class in one line.

var current = new Semver(21, 0);
var again = new Semver(21, 0);

System.out.println(current);                // records print themselves
System.out.println(current.equals(again));  // and compare by value
System.out.println(current.major());        // accessors take the field names
System.out.println(current.tag());

record Semver(int major, int minor) {
    String tag() { return "v" + major + "." + minor; }
}

How it works

1. record Semver(int major, int minor) declares fields and all.
2. Records print themselves and compare by value.
3. Accessors take the field names; extra methods are allowed.

Keywords and builtins used here

• Semver
• int
• new
• record
• return
• tag
• var

The run, in numbers

Lines

11

Characters to type

409

Tokens

104

Three-star pace

85 tpm

At the three-star pace of 85 tokens a minute, this run takes about 73 seconds.

Type this snippet

Step 3 of 4 in Classes & records, step 20 of 29 in Language basics.

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Records in other languages

• C#