Modern Java toys that boost productivity, from type inf...

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Modern Java toys that boost productivity, from type inference to text blocks

· java

Local variable type inference

Removes redundant code and saves a lot of typing.

AccountsOverviewPage accountsOverviewPage = page.login(username, password);

becomes

var accountsOverviewPage = page.login(username, password);

Stream API: takeWhile and dropWhile

The takeWhile() operation processes the items of a collection and keeps each one while a given condition is true.
The dropWhile() operator does the opposite: It disregards the items of a collection while the predicate is true.

Switch expressions

Java 12 introduced switch expressions, which enable you to use switch to directly assign a value to a variable.

String id = switch(name) {
        case "john" -> "12212";
        case "mary" -> "4847474";
        case "tom" -> "293743";
        default -> "";
};

Records

Records are great for simple classes that only need to contain fields and access to those fields.

public record Account(
       int id,
       int customerId,
       String type,
       double balance) {}

Text blocks

It allows you to use three quotation marks to open and close a big block of text.

return """
          {
            "id": 13344,
            "customerId": 12212,
            "type": "CHECKING",
            "balance": 3821.93
          }
       """;

Official article

PDF