本文介绍了什么是subClass sc = new subClass（）和superClass sc = new subClass之间的区别？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
class superClass {}
class subClass extends superClass{}
public class test
{
public static void main()
{
superClass sc1 = new subClass();
subClass sc2 = new subClass();
//whats the difference between the two objects created using the above code?
}
}
推荐答案
简单说明：
当你使用
Simple explanation :When you use
SuperClass obj = new SubClass();
只有在 SuperClass 中定义的公共方法可以访问。 SubClass 中定义的方法不是。
Only public methods that are defined in SuperClass are accessible. Methods defined in SubClass are not.
当您使用
SubClass obj = new SubClass();
SubClass 中定义的公共方法也可访问以及 SuperClass 公共方法。
public methods defined in SubClass are also accessible along with the SuperClass pubic methods.
在两种情况下创建的对象都是相同的。
Object created in both cases is the same.
Ex：
public class SuperClass {
public void method1(){
}
}
public class SubClass extends SuperClass {
public void method2()
{
}
}
SubClass sub = new SubClass();
sub.method1(); //Valid through inheritance from SuperClass
sub.method2(); // Valid
SuperClass superClass = new SubClass();
superClass.method1();
superClass.method2(); // Compilation Error since Reference is of SuperClass so only SuperClass methods are accessible.
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