内部类编译时问题？？？？？
public class SimpleThreads {

//Display a message, preceded by the name of the current thread
static void threadMessage(String message) {
String threadName = Thread.currentThread().getName();
System.out.format( "%s: %s%n ", threadName, message);
}

private static class MessageLoop implements Runnable {
public void run() {
String importantInfo[] = {
"Mares eat oats ",
"Does eat oats ",
"Little lambs eat ivy ",
"A kid will eat ivy too "
};
try {
for (int i = 0; i < importantInfo.length; i++) {
//Pause for 4 seconds
Thread.sleep(4000);
//Print a message
threadMessage(importantInfo[i]);
}
} catch (InterruptedException e) {
threadMessage( "I wasn 't done! ");
}
}
}

public static void main(String args[]) throws InterruptedException {


//Delay, in milliseconds before we interrupt MessageLoop

//thread (default one hour).
long patience = 1000 * 60 * 60;

//If command line argument present, gives patience in seconds.
if (args.length > 0) {
try {
patience = Long.parseLong(args[0]) * 1000;
} catch (NumberFormatException e) {
System.err.println( "Argument must be an integer. ");
System.exit(1);
}

}

threadMessage( "Starting MessageLoop thread ");
long startTime = System.currentTimeMillis();
Thread t = new Thread(new MessageLoop());
t.start();

threadMessage( "Waiting for MessageLoop thread to finish ");
//loop until MessageLoop thread exits
while (t.isAlive()) {
threadMessage( "Still waiting... ");
//Wait maximum of 1 second for MessageLoop thread to
//finish.
t.join(1000);
if (((System.currentTimeMillis() - startTime) > patience) &&
t.isAlive()) {
threadMessage( "Tired of waiting! ");
t.interrupt();
//Shouldn 't be long now -- wait indefinitely

t.join();
}

}
threadMessage( "Finally! ");
}
}
１，这就一个文件可编译后怎么出来三个class呀？？？
　而它只有一个内部类。
２，此段程序中如何在运行时通过String [] args来输入信息？？？
３，此段程序中怎么来体现中方法interrupt的调用？？？
４，

[解决办法]
第一个问题我也不清楚
第二个问题：
String[] args实际上就是你运行程序时输入的参数
[解决办法]
2.java SimpleThreads 3
3.interrupt()使程序跳出for循环进入catch块
[解决办法]
我编译出来只有两个。