Example usage for statics in local classes for one-time computation with Java 17

LocalOnceExample.java

public class LocalOnceExample {

    public static void main(String[] args) {
        foo();
        foo();
    }

    static int foo() {
        System.out.println("start foo");
        class Local {
            private static final int value = compute();
            private static int compute() {
                System.out.println("compute");
                return 42;
            }
        }
        System.out.println("end foo");
        return Local.value;
    }
}