我写了一个简单的，自己改改，要睡觉了。

package qq;

public class Friend {

//昵称

private String displayName;

//唯一标识

private int id;

//是否在线

private boolean isOnLine;

public Friend(String displayName, int id, boolean isOnLine) {

this.displayName = displayName;

this.id = id;

this.isOnLine = isOnLine;

}

public String getDisplayName() {

return displayName;

}

public void setDisplayName(String displayName) {

this.displayName = displayName;

}

public int getId() {

return id;

}

public void setId(int id) {

this.id = id;

}

public boolean isOnLine() {

return isOnLine;

}

public void setOnLine(boolean isOnLine) {

this.isOnLine = isOnLine;

}

}

package qq;

import java.awt.Dimension;

import java.awt.GridBagConstraints;

import java.awt.GridBagLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.util.List;

import javax.swing.JButton;

import javax.swing.JOptionPane;

import javax.swing.JPanel;

public class FriendListPnl extends JPanel {

private List friends;

private JButton[] friendList;

public FriendListPnl(List friends) {

this.friends = friends;

initFriendList();

initGUI();

}

private void initGUI()

{

this.setLayout(new GridBagLayout());

GridBagConstraints constraints = new GridBagConstraints();

constraints.fill = GridBagConstraints.HORIZONTAL;

constraints.weightx = 1.0;

constraints.gridx = 0;

constraints.ipadx = 1;

constraints.ipady = 1;

constraints.anchor = GridBagConstraints.NORTHWEST;

for (int i = 0; i < friendList.length; i++) {

constraints.gridy = i;

if (i == friendList.length - 1)

{

constraints.weighty = 1.0;

}

this.add(friendList[i], constraints);

}

}

private void initFriendList()

{

friendList = new JButton[friends.size()];

Dimension d = new Dimension(100, 22);

JButton friend = null;

Friend friendInfo = null;

for (int i = 0; i < friendList.length; i++) {

friend = new JButton();

friend.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

JOptionPane.showMessageDialog(null, "您好！");

}

});

friend.setBorder(null);

friendInfo = friends.get(i);

friend.setText(new StringBuffer().append(friendInfo.getDisplayName())

.append("(").append(friendInfo.getId()).append(")").toString());

friend.setPreferredSize(d);

friend.setEnabled(friendInfo.isOnLine());

friendList[i] = friend;

}

}

}

package qq;

import java.awt.Dimension;

import java.awt.Point;

import java.awt.Toolkit;

import java.util.ArrayList;

import java.util.List;

import javax.swing.JFrame;

import javax.swing.JScrollPane;

public class TestFrame {

public static void main(String[] args) {

Friend f1 = new Friend("天下", 22, true);

Friend f2 = new Friend("倚天", 21, false);

Friend f3 = new Friend("屠龙", 20, true);

List list = new ArrayList();

list.add(f1);

list.add(f2);

list.add(f3);

JFrame frame = new JFrame("QQ");

frame.setSize(150, 350);

Dimension d = Toolkit.getDefaultToolkit().getScreenSize();

frame.setLocation(new Point(d.width - frame.getWidth() - 25, 10));

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.getContentPane().add(new JScrollPane(new FriendListPnl(list)));

frame.setVisible(true);

}

}