简答题 在总线型以太网中，设传输介质长100米，数据传输速率为100Mbps，信号在介质中的传播延迟为5μs/km，帧长为1500位，某站已向网上发送了100位数据尚未检测到冲突，此后还会发现冲突吗？

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请完成下面的程序：实现一个可以每秒跳动的时钟。运行如下图所示。请填写横线处的内容。注意：请勿改动main主方法和其他已有语句内容，仅在下划线处填入适当的语句。import javax.swing.*;import java.awt.*;import java.awt.event.*;import java.util.*;public class Example2_12 extends JFrame (1) implements Runnable{Thread thread1;Color handColor;Color numberColor;JLabel jlabell = new JLabel();public Example2_12(){enableEvents(AWTEvent.WINDOW_EVENT_MASK);try{getContentPane().add(jlabell, BorderLayout. SOUTH);}catch (Exception e){System.out.println(e.getMessage());}}public static void main(String args[]){Example2 12_clock1 = new Example2_12();clock1.init();clock1.start();clock1.setSize(260, 230);clock1.setResizable(false);clock1.show();}public void init(){int x, y;handColor = Color.blue;numberColor = Color.darkGray;setBackground(Color.white);}public void paint (Graphics g){int xh, yh, xm, ym, xs, ys, s = 0, m = 10, h = 10, xpoint, ypoint;String today;Calendar c1 = ______;s = c1.get(Calendar.SECOND);m = c1.get(Calendar.MINUTE);h = c1.get(Calendar.HOUR);int day, month, year, weekday;day = c1.get(Calendar.DATE);month = c1.get(Calendar.MONTH) + 1;year = c1. get (Calendar. YEAR);weekday = c1.get (Calendar. DAY_OF_WEEK);jlabell.setText('Today is '+ year + ' ' + month + ' ' + day + ' '+ 'Time:' + h + ':' + m + ':' + s);xpoint = 130;ypoint = 100;xs =(int) (Math.cos(s * 3.14f 30 - 3.14f 2) * 45 + xpoint);ys =(int) (Math.sin(s * 3.14f 30 - 3.14f 2) * 45 + ypoint);xm =(int) (Math.cos (m * 3.14f 30 - 3.14f 2) * 40 + xpoint);ym =(int) (Math.sin(m * 3.14f 30 - 3.14f 2) * 40 + ypoint);xh =(int) (Math.cos( (h * 30 + m 2) * 3.14f 180 - 3.14f 2) * 30 + xpoint);yh =(int) (Math.sin( (h * 30 + m 2) * 3.14f 180 - 3.14f 2) * 30 + ypoint);g.setColor (handColor);g.clearRect(0, 0, 260, 200);g.drawOval(xpoint 2 + 10, ypoint 2 - 5, 110, 110);g.setColor(numberColor);g.drawString('9', xpoint - 45, ypoint + 3);g.drawString('3', xpoint + 40, yp 点击查看答案