java - Why does the following code compile but not run?

Question

class Demo
{
    Demo()
    {
        System.out.println("Hello From Demo");
    }
}

class demo
{   
    demo()
    {
        System.out.println("Hello From Small Demo");
    }
}

class Test
{
    public static void main(String arg[])
    {
        Demo d1=new Demo();
        demo d2=new demo();
    }
}

This code compiles but not doesn't run; When I try to run this program, it gives a classNotFoundException. What am I doing wrong?

Answer 1

在 Unix 下，和/或编译成 .jar 应用程序，文件名区分大小写。一切都会奏效：demo.class，Demo.class。

在 Windows 下编译 demo 和 Demo 会覆盖一个文件。