编写程序，要求从命令行输入一个目录名称，输出该目录中所有子目录和文件。

A . <welcome-file>start.jsp</welcome-file>  B . <welcome-file-list>start.jsp</welcome-file-list>  C . <welcome-list>  <welcome-file>start.jsp</welcome-file> </welcome-list>  D . <welcome-file-list> <welcome-file>start.jsp</welcome-file>   </welcome-file-list&gt

A . MD B . RD C . CD D . ED

A . guest B . Administrator C . test D . root

A . 1s B . 1s-a C . 1s-1 D . 1s-1a

A . mywork B . myfork C . fork D . root

A . <welcome-file>start.jsp</welcome.-file>  B . <welcome-file-list> start.jsp </welcome.-file-list>  C . <welcome-file><welcome-file> start.jsp</welcome-file> </welcome.-file>  D . <welcome-file-list><welcome-file> start.jsp </welcome.-file></welcome-file-list&gt

A . IPC$ B . C$ C . D$ D . E$

A . finD.–name“？.c”–print B . finD.–name“#.c”–print C . finD.–name“!*.c”–print D . finD.–name“*.c”–print

A .

A . .. B . . C . myfork D . mywork

注意：不改动程序的结构，不得增行或删行。 程序运行结果如下： <img src='https://img2.soutiyun.com/shangxueba/ask/11157001-11160000/11157624/ct_ctjjm_compapp_00177(20092).jpg' /> import javax.swing.*; import java.awt.*; import java.awt.event.*; /* ＜applet code="exll_3.class" width=800 height=400 ＞ ＜/applet＞ */ public class exll_3 extends JApplet private JButton jb = new JButton("OK"); private JTextPane jtp = new JTextPane(); private JTextField itl=new JTextField(8); private int n=15; public void init() { jb.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e){ n=jtf.getText(); jtp.setText("" ); for(int i = n-1; i＞=0;i--){ String s = ""; for(int j = 0; j ＜ i; j++) s += " "; for(int j = 0; j ＜ n; j++) s + = "*"; jtp.setText(s+"\n"); } } }); Container cp = getContentPane(); cp.add(BorderLayout.NORTH,jtf); cp.add(BorderLayout.CENTER,new JScrollPane(jtp)); cp.add(BorderLayout.SOUTH, jb); } public static void main(String[] args) { ex11_3 obj11_3=new ex11_3(); String str = obj11_3.getClass() .toString(); if(str.indexOf("class") != -1) str= str.substring(6); JFrame. frm = new JFrame(str); frm.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent we) { System.exit (0); } }); frm.getContentPane().add(obj11_3); frm.setsize(300, 500); frm.setVisible(true); } } ex11_3.html ＜HTML＞ ＜HEAD＞ ＜TITLE＞ex11_3＜/TITLE＞ ＜/HEAD＞ ＜BODY＞ ＜applet code="ex11_3.class" width=800 height=400 ＞ ＜/applet＞ ＜/BODY＞ ＜/HTML＞

<img src='https://img2.soutiyun.com/shangxueba/ask/4377001-4380000/4377508/ct_ctvbbm_choose_05575(20092).jpg' /> 能够正确实现上述功能的程序是 A．Private Sub Dir1_Change() Filet．Path=Dir1．Path End Sub Private Sub Dive1_Change() Dir1．Path=Drive1．Drive Label1，Caption=File1 ListCount End Sub B．Private Sub Dir1_Change() File．Path=Dtr1．Path End Sub privage Sub Dive1_Change() Dir1．path=Drive1．Drive Lahel1．Caption=File1．List End Sub C．Private Sub Dir1_Change() File1. Path = Dirl．Path Label1．Caption＝File1, ListCount End Sub Private Sub Drive1_Change() Dir1．Path = Drive1. Drive Label1．Captiol1 = File1．ListCount End Sub( D．Private Sub Dir1_Change() Filel. Path = Dirl．Path Label1．Caption = File1．ListCount End Sub Private Sub Dive1_Change() Dir1．Path = Drive1．Drive Label1．Caption = File1．List End Sub

A．ABCDEFG B．abcdefg C．GFEDCBA D．gfedcba

A．输出0 B．输出25 C．输出45 D．无任何输出