s-day01--Object概述

s-day01/src/com/inmind/object01/Demo01.java

@@ -0,0 +1,12 @@
+package com.inmind.object01;
+/*
+Object类:所有类的父类，java中所有的类直接或者间接继承自Object
+ */
+public class Demo01 {
+    public static void main(String[] args) {
+        Student s = new Student();
+        System.out.println(s.toString());
+        System.out.println(s.hashCode());
+    }
+
+}

s-day01/src/com/inmind/object01/Person.java

@@ -0,0 +1,4 @@
+package com.inmind.object01;
+
+public class Person extends Object{//直接继承Object
+}

s-day01/src/com/inmind/object01/Student.java

@@ -0,0 +1,4 @@
+package com.inmind.object01;
+
+public class Student extends Person {//直接继承person类，间接继承了Object
+}