Can you give an example of a situation where the use of checked exceptions is justified?

In Java, the methods orElse and orElseGet are used with the Optional class to specify a default value if the object is absent.

• orElse(T other) — takes a default value that is computed immediately when the method is called, regardless of whether the Optional has a value.
• orElseGet(Supplier<? extends T> other) — takes a supplier (function) that is called only if the value is absent, so the value computation is deferred until needed.

Features:

• If computing the default value is expensive or has side effects, it's better to use orElseGet to avoid unnecessary costs.
• If the value is simple and quick to compute, orElse can be used.

Example:

Optional<String> opt = Optional.empty();

// orElse always computes "default"
String result1 = opt.orElse(getDefault());

// orElseGet calls getDefault() only if opt is empty
String result2 = opt.orElseGet(() -> getDefault());

public String getDefault() {
    System.out.println("Computing default value");
    return "default";
}