我这个怎么JTextArea怎么也带不上滚动条啊?就是“显示显示信息处”那一块怎么也带不上滚动条， 代码如下：

加上一个滚动条就可以了，改过的代码在下面：
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextArea;

public class CV {
public static void main(String args[]) {
new ClientFrame();
}
}

class ClientFrame extends JFrame {
JButton close, send;
JTextArea showText, inputText, gonggao;
JLabel label;
JTable table;
JScrollPane jsp;
Object a[][];
int rows = 10;

ClientFrame() {
super("聊天室窗口");
setLayout(null);
setSize(500, 280);

showText = new JTextArea("显示信息处：");

jsp=new JScrollPane(showText);
jsp.setSize(358, 140);
jsp.setLocation(0, 0);
add(jsp);

gonggao = new JTextArea("公告处：");
gonggao.setSize(142, 155);
gonggao.setLocation(365, 0);
add(gonggao);

inputText = new JTextArea();
inputText.setSize(358, 60);
inputText.setLocation(0, 150);
add(inputText);

Object name[] = { "1" };
a = new Object[rows][1];
table = new JTable(a, name);
table.setSize(140, 80);
table.setLocation(365, 165);
add(table);

close = new JButton("关闭");
send = new JButton("发送");
JPanel pane = new JPanel();
pane.add(close);
pane.add(send);
pane.setSize(358, 40);
pane.setLocation(0, 210);
add(pane);

setVisible(true);
validate();
setResizable(false);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}

}