又出问题了！

class Computer
{
String name = "电脑主机";
boolean flag = false;
public synchronized void set(String name)
{
if(!flag)
try
{
super.wait();
}
catch(InterruptedException e)
{
e.printStackTrace();
}
this.setName(name);
flag = false;
super.notify();
}
public synchronized void get(String name)
{
if(flag)
try
{
super.wait();
}
catch(InterruptedException e)
{
e.printStackTrace();
}
System.out.println(this.getName());
flag = true;
super.notify();
}
public String getName()
{
return name;
}

public void setName(String name)
{
this.name = name;
}
}
class Producer implements Runnable
{
Computer computer = null;
public Producer(Computer computer)
{
this.computer = computer;
}
public void run()
{
boolean flag = false;
for(int i=0;i<10;i++)
{
if(flag)
{
this.computer.set("电脑主机");
flag = false;
}
else
{
this.computer.set("显示器");
flag = true;
}

}
}
}
class Consumer implements Runnable
{
Computer computer = null;
public Consumer(Computer computer)
{
this.computer = computer;
}
public void run()
{
for(int i=0;i<10;i++)
try
{
Thread.sleep(100);
}
catch(InterruptedException e)
{
e.printStackTrace();
}
this.computer.getName();
}
}

public class ComputerTest
{
public static void main(String[] args)
{
Computer comp = new Computer();
Producer pro = new Producer(comp);
Consumer con = new Consumer(comp);
new Thread(pro).start();
new Thread(con).start();
}

}

出现下列提示：
F:\>javac ComputerTest.java
javac: 找不到文件： ComputerTest.java
用法: javac <options> <source files>
-help 用于列出可能的选项

本来就是放在f盘根目录先的嘛，怎么会提示找不到呢？