chapter 4

src/chapter4/Example11/Example11.java

@@ -0,0 +1,46 @@
+package chapter4.Example11;
+
+interface Animal {
+    int ID = 1;             // 接口默认为常量添加 public static final
+    String NAME = "牧羊犬";    // 接口默认为常量添加 public static final
+
+    // 定义抽象方法shout()，接口默认添加 public abstract
+    void shout();
+
+    // 静态方法，默认添加 public
+    static int getID() {
+        return Animal.ID;
+    }
+
+    // 抽象方法
+    public void info();
+}
+
+interface Action {
+    public void eat();
+}
+
+class Dog implements Animal, Action {
+    public void eat() {
+        System.out.println("喜欢吃骨头");
+    }
+
+    // 重写Animal接口中的抽象方法shout()
+    public void shout() {
+        System.out.println("汪汪...");
+    }
+
+    public void info() {
+        System.out.println("名称：" + NAME);
+    }
+}
+
+public class Example11 {
+    public static void main(String[] args) {
+        System.out.println("编号：" + Animal.getID());
+        Dog dog = new Dog();
+        dog.info();
+        dog.shout();
+        dog.eat();
+    }
+}