匿名内部类

class Dog {
    protected void say() { }
}

public class Extend_Test {
    public static void main(String[] args) {
        Dog hashiqi = new Dog() {
            public void say() {
                System.out.println("2 ha");
            }
        };
        
        hashiqi.say();
    }
}

之前只见过接口的匿名内部类。