JuniorTheoryCommon

What does the program print?

JAVA

public class Main {
    public static void main(String[] args) {
        try (Door a = new Door("A"); Door b = new Door("B")) {
            System.out.print(a.name() + b.name() + " ");
        }
    }
}
record Door(String name) implements AutoCloseable {
    public void close() { System.out.print(name); }
}

AB BA

Expecting AB AB: resources do not close in the order they were declared; try-with-resources closes them in reverse, the last one opened first.
Expecting a compile error over the missing catch: AutoCloseable.close() declares throws Exception, but Door.close() declares nothing, so there is nothing to catch.

Why does try-with-resources close resources in reverse order?
What happens when both the body and close() throw an exception?

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JuniorTheoryCommon

What does the program print?

JAVA

public class Main {
    public static void main(String[] args) {
        try (Door a = new Door("A"); Door b = new Door("B")) {
            System.out.print(a.name() + b.name() + " ");
        }
    }
}
record Door(String name) implements AutoCloseable {
    public void close() { System.out.print(name); }
}

AB BA

Expecting AB AB: resources do not close in the order they were declared; try-with-resources closes them in reverse, the last one opened first.
Expecting a compile error over the missing catch: AutoCloseable.close() declares throws Exception, but Door.close() declares nothing, so there is nothing to catch.

Why does try-with-resources close resources in reverse order?
What happens when both the body and close() throw an exception?

Back to questions Open topic in roadmap →Answer it yourself — Quiz