import java.net.*;
public class DayWatch
{
	private DatagramSocket ds;
	private DatagramPacket dp;
		
	public static void main(String args[]) throws Exception
	{
		DayWatch d = new DayWatch();
		d.go();
	}
	public void go() throws Exception
	{
		...;//長(zhǎng)度為64的字節(jié)型數(shù)組
		String s;
		ds =...;//新建數(shù)據(jù)報(bào)套接字
		dp =...;//構(gòu)造一個(gè)接收數(shù)據(jù)報(bào)
			
		...//循環(huán)
		{
			...;//接收數(shù)據(jù)報(bào)
			...;//將接收數(shù)據(jù)報(bào)中的數(shù)據(jù)轉(zhuǎn)換為字符串
			System.out.println("Time signal received form " +/*接收數(shù)據(jù)報(bào)的地址*/ + "\n Time is: " + /*接收到的字符串*/);
		}
	}
}

javac