ইনার ক্লাসগুলোতে স্ট্যাটিক মেম্বার (Static members in inner classes)

public class Point {
    private final int x, y;
    public Point(int x, int y) { ... }
    public int getX() { return x; }
    public int getY() { return y; }
    // equals, hashCode, toString
}

// Anyone can extend Shape
public abstract class Shape { }
public class Circle extends Shape { }
public class Rect extends Shape { }
// unknown subclasses possible

interface Logger {
    default void logInfo(String msg) {
        System.out.println(
            "[INFO] " + timestamp() + msg);
    }
    default void logWarn(String msg) {
        System.out.println(
            "[WARN] " + timestamp() + msg);
    }
}