jsp脚本、jsp声明、jsp输出表达式、javascript、jsp标签、struts2标签

public class Test
{
public static void main(String args[])
{
AA a = new AA();
a.start();

BB b = new BB();
Thread t = new Thread(b);
t.start();
}
}

class AA extends Thread
{
public void run()
{
System.out.println("1");
}

public void start()
{
System.out.println("2");
}
}

class BB implements Runnable
{
public void run()
{
System.out.println("3");
}

public void start()
{
System.out.println("4");
}
}

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3