class Lt9_2
{
public static void main(String args[])
{
People teacher=new People(),
student=new People();
for(int i=1;i<=5;i++)
{
teacher.start();
student.start();
}
}
}
class People extends Thread
{
public void run()
{
if(Thread.currentThread().getName().equals("teacher"))
{
System.out.println("我是老师");
}
else if(Thread.currentThread().getName().equals("student"))
{
System.out.println("我是学生");
}
}
}

编译时报错：
Exception in thread "main" java.lang.IllegalThreadStateException
at java.lang.Thread.start(Thread.java:571)
at Lt9_2.main(ThreadTest.java:470)

Process completed.
请问是什么错呢？应该怎么改？

[此贴子已经被作者于2007-11-2 12:28:13编辑过]

class Lt9_2
{
public static void main(String args[])
{
People teacher=new People(),
student=new People();
teacher.start();
student.start();
}
}
class People extends Thread
{
public void run()
{
if(Thread.currentThread().getName().equals("teacher"))
{
System.out.println("我是老师");
}
else if(Thread.currentThread().getName().equals("student"))
{
System.out.println("我是学生");
}
}
}
怎么我把for循环去掉后没有输出呢？不是应该teacher.start()启动了线程会自动调用run()方法吗？

People teacher=new People(),
student=new People();
千里的意思是说这个两个创建的是同一个线程？

class Lt9_2
{
public static void main(String args[])
{
Teacher teacher=new Teacher();
Student student=new Student();
Student student1=new Student();
teacher.start();
student.start();
student1.start();
}
}
class Teacher extends Thread
{
public void run()
{
for(int i=1;i<=5;i++)
{
System.out.println("我是老师");
}
}
}
class Student extends Thread
{
public void run()
{
for(int i=1;i<=5;i++)
{
System.out.println("我是学生");
}
}
}
这样又可以正确运行了啊！