javaSE-day01-Object概述

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

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+package com.inmind.object01;
+/*
+Object:是所有类的父类,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) {
+        //普通创建对象
+        Person p = new Person();
+        Student s = new Student();
+        //多态创建对象
+        Person p1 = new Student();
+
+    }
+}

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

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+package com.inmind.object01;
+
+public class Person {//直接继承自Object
+}

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

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+package com.inmind.object01;
+
+public class Student extends  Person{//间接继承自Object
+}