下列JApplet实现了一个多行文本输入区和一个按钮，单击按钮则清空文本区内容，文本区使用带标题的边框。选择正确的语句填入横线处。 import javax,Swing.*; import javA.awt.event.*; import java,awt.*; public class ex26 extends Japplet { public void init() { Container cp = getContentPane(); Jbutton jb = new Jbutton('清空'); final JTextArea jta = new JTextArea(); jB.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent ae) { jtA.setText (''); } }); cp.add('South', jb); cp.add('Center', jta); } } { jtA.setBorder(BorderFactory, createTitledBorder('文本区'));B.cp.setBorder(BorderFactory, createTitledBorder('文本区'));C.jtA.setBorder(BorderFactory, createTitledBorder('文本区'));D.jtA.setBorder(Border, createTitledBorder('文本区'));
A.*;
B.awt.event.*;
C.*;
D.addActionListener(new
E.add('South',
F.add('Center',
G.setBorder(BorderFactory,
H.cp.setBorder(BorderFactory,
I.jtA.setBorder(BorderFactory,
J.jtA.setBorder(Border,