day09--继承的特点-单继承-多层继承

day09/src/com/inmind/extends_td05/A.java

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+package com.inmind.extends_td05;
+//父类
+public class A {
+}

day09/src/com/inmind/extends_td05/B.java

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+package com.inmind.extends_td05;
+
+public class B extends A{
+}

day09/src/com/inmind/extends_td05/C.java

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+package com.inmind.extends_td05;
+//父类
+public class C extends B{
+}

day09/src/com/inmind/extends_td05/D.java

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+package com.inmind.extends_td05;
+
+public class D extends C{
+}

day09/src/com/inmind/extends_td05/Demo07.java

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+package com.inmind.extends_td05;
+/*
+继承的特点-单继承-多层继承
+注意：java中所有的类，都直接或间接继承Object
+ */
+public class Demo07 {
+    public static void main(String[] args) {
+        D d = new D();
+    }
+}