import java.awt.*;

import javax.swing.*;

public class QQMain{

public static void main(String args[]){

JFrame w = new JFrame();

w.setSize(300, 400);

//new 组件

JTextField txtMess = new JTextField();

JComboBox cmbUser = new JComboBox();

JButton btnSend = new JButton("发送");

JTextArea txtContent = new JTextArea();

//设置滚动条

JScrollPane spContent = new JScrollPane(txtContent);

//布置小面板

JPanel panSmall = new JPanel();

panSmall.setLayout(new GridLayout(1,2));

panSmall.add(cmbUser);

panSmall.add(btnSend);

//布置大面板

JPanel panBig = new JPanel();

panBig.setLayout(new GridLayout(2, 1));

panBig.add(txtMess);

panBig.add(panSmall);

//布置窗体

w.setLayout(new BorderLayout());

w.add(panBig, BorderLayout.NORTH);

w.add(spContent, BorderLayout.CENTER);

w.setVisible(true);

}

}