Demo code of Java 24

1.java

import static java.lang.System.out;

public class Main {
    void main() {
        var main = new Main();
        var grade = main.calculateGrade(50);
        out.println(grade);
    }

    public String calculateGrade(int score) {
        return switch (score) {
            case int i when i >= 90 -> "A";
            case int i when i >= 80 -> "B";
            case int i when i >= 70 -> "C";
            case int i when i >= 60 -> "D";
            case int i when i >= 50 -> "E";
            case int i -> "Failed with a score =" + score;
        };
    }
}

2.java

import static java.lang.System.out;
import module java.base;

public class Demo {

    public static void main(String[] args) {
        List<String> elements = List.of("A", "B", "C");
        for (String element : elements) {
            String upperCase = element.toUpperCase();
            out.println(upperCase);
        }
    }
}