JuniorTheoryCommon

What happens when this program is compiled and run?

JAVA

public class Main {
    static void fail() { throw new Exception("boom"); }
    public static void main(String[] args) {
        try {
            fail();
        } catch (Exception e) {
            System.out.println(e.getMessage());
        }
    }
}

It does not compile

Expecting boom: the catch in main does not cover fail; every method that may throw a checked exception must catch it or declare it with throws.
Expecting a run-time error: a checked exception is checked by the compiler, so a missing throws stops the build, not the running program.

What changes if fail throws new RuntimeException("boom") instead?
Where do you add throws Exception to make the program print boom?

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Back to questions

JuniorTheoryCommon

What happens when this program is compiled and run?

JAVA

public class Main {
    static void fail() { throw new Exception("boom"); }
    public static void main(String[] args) {
        try {
            fail();
        } catch (Exception e) {
            System.out.println(e.getMessage());
        }
    }
}

It does not compile

Expecting boom: the catch in main does not cover fail; every method that may throw a checked exception must catch it or declare it with throws.
Expecting a run-time error: a checked exception is checked by the compiler, so a missing throws stops the build, not the running program.

What changes if fail throws new RuntimeException("boom") instead?
Where do you add throws Exception to make the program print boom?

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