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HTML / CSS / JS

public class StaticAndEnum {

// Enum with fields and methods
    enum Planet {
        MERCURY(3.303e+23, 2.4397e6),
        VENUS  (4.869e+24, 6.0518e6),
        EARTH  (5.976e+24, 6.37814e6),
        MARS   (6.421e+23, 3.3972e6);

private final double mass;   // in kilograms
        private final double radius; // in metres

Planet(double mass, double radius) {
            this.mass   = mass;
            this.radius = radius;
        }

static final double G = 6.67300E-11;

double surfaceGravity() {
            return G * mass / (radius * radius);
        }

double surfaceWeight(double otherMass) {
            return otherMass * surfaceGravity();
        }
    }

// Static nested class (no outer instance needed)
    static class Config {
        static final int MAX_RETRIES = 3;
        static final String DEFAULT_HOST = "localhost";
        // ...
    }

// Static initializer block
    static final java.util.Map<String, Integer> CODES;
    static {
        CODES = new java.util.HashMap<>();
        CODES.put("OK",    200);
        CODES.put("NOT_FOUND", 404);
        CODES.put("ERROR", 500);
    }

public static void main(String[] args) {
        double earthWeight = 75.0; // kg
        double mass = earthWeight / Planet.EARTH.surfaceGravity();

System.out.println("Weight on each planet (for " + earthWeight + " kg person):");
        for (Planet p : Planet.values()) {
            System.out.printf("  %-10s : %6.2f N%n", p, p.surfaceWeight(mass));
        }

System.out.println("
HTTP status codes:");
        CODES.forEach((k, v) -> System.out.printf("  %-10s = %d%n", k, v));

System.out.println("Max retries: " + Config.MAX_RETRIES);
        System.out.println("Earth ordinal: " + Planet.EARTH.ordinal()); // 2
    }
}