day09-继承的特点-单继承&多层继承

day09/src/com/inmind/extends_member02/Demo02.java

@@ -11,9 +11,7 @@ public class Demo02 {
         System.out.println(zi.numFu);//200
         System.out.println(zi.numZi);//100
         System.out.println(zi.num);//101
-        System.out.println("----------");
         zi.methodZi();
-        System.out.println("----------");
         zi.methodFu();
         System.out.println("----------3种同名变量的访问--------------");
         zi.method();

day09/src/com/inmind/extends_td06/A.java

@@ -0,0 +1,4 @@
+package com.inmind.extends_td06;
+
+public class A  {
+}

day09/src/com/inmind/extends_td06/B.java

@@ -0,0 +1,4 @@
+package com.inmind.extends_td06;
+
+public class B extends A{
+}

day09/src/com/inmind/extends_td06/C.java

@@ -0,0 +1,4 @@
+package com.inmind.extends_td06;
+
+public class C extends B{
+}

day09/src/com/inmind/extends_td06/Demo06.java

@@ -0,0 +1,12 @@
+package com.inmind.extends_td06;
+/*
+ 继承的特点：
+ 1.只支持单继承，一个类只有一个父类
+ 2.支持多层继承，可以有多个层级父类
+ */
+public class Demo06 {
+    public static void main(String[] args) {
+        C c = new C();
+        System.out.println(c.hashCode());
+    }
+}