Sonar: lambda - remove useless braces around the statement

Question

These code examples:

import java.util.Observer;

public class Main {
    public static void main(String[] args) {
        Observer observer = (o, arg) -> {
            if (arg != null) {
                System.out.println(arg);
            }
        };
    }
}

---

import java.util.Observer;

public class Main {
    public static void main(String[] args) {
        Observer observer = (o, arg) -> {
            try {
                String test = (String) arg;
                ...
            }
            catch (ClassCastException e) {
            }
        };
    }
}

do not comply with this rule of sonarks ::

Lamdbas containing only one statement should not insert this statement in a block: remove useless curly braces around the statement

how can i fix this?

Answer 1

The classification of these braces as “worthless” is incorrect.

You can omit curly braces around one expression statement, that is, for example, a method call, an expression, newor x++, x+=yetc.

… -> { return x; } … -> x.

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. , , .

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