import java.io.*;
public class WithThread
{
static PrintWriter out = new PrintWriter(System.out,true);
public static void main(String args[])
{
//first task:some pseudo-I/O operation
ThreadPseudoIO pseudo = new ThreadPseudoIO();
/* 上一行出错信息:
  non-static variable this cannot be referenced from a static context
  错误箭头指在  new  上
*/
pseudo.start();
//second task:some random task
showElapsedTime("Another task starts");
}
static long baseTime = System.currentTimeMillis();
//show the time elapsed since the program started
static void showElapsedTime(String message)
{
long elapsedTime=System.currentTimeMillis()-baseTime;
out.println(message + " at "+ (elapsedTime/1000.0) + " seconds");
}
//pseudo-I/O operation run in a separate thread
class ThreadPseudoIO extends Thread
{
int data=-1;
ThreadPseudoIO()
{
//constructor
WithThread.showElapsedTime("ThreadPseudoIO created");
}
public void run()
{
WithThread.showElapsedTime("ThreadPseudoIO starts");
try
{
Thread.sleep(10000);
data=999;
WithThread.showElapsedTime("ThreadPseudoIO finishes");
}
catch(InterruptedException e){}
}
}
}

应该把class ThreadPseudoIO extends Thread
改成 static class ThreadPseudoIO extends Thread
试试看！

在静态函数中不能使用非静态变量.
将ThreadPseudoIO pseudo = new ThreadPseudoIO();
改成
static ThreadPseudoIO pseudo = new ThreadPseudoIO();

ThreadPseudoIO pseudo = new ThreadPseudoIO();
ThreadPseudoIO 不是一个静态内部类。
使用：WithThread.ThreadPseudoIO pseudo = new WithThread.ThreadPseudoIO(); 试试看

感觉整个程序乱78糟的
才刚开始学呢就不要学着人家这个类套着那个类的,把自己搞的糊涂了吧

程序的可读性太差，建议先修改程序在调试