怎样用java编写图形界面的Application程序

包括分别用于输入字符串和浮点数的两个TextField,以及两个按钮（一个是“输入”按钮，一个是“输出”按钮）和一个TextArea。用户在两个TextField中输入数据并单击“输入”按钮后，程序把这两个数据保存入一个文件file.dat中，单击“确定”按钮，则把这个文件的内容显示在TextArea中。

java编写图形界面需要用到swing等组件，可以在eclipse中安装windowbuilder来开发窗体，自动生成窗体代码，然后自己再根据需要修改，如：

package mainFrame;

import java.awt.EventQueue;

import java.awt.event.MouseAdapter;

import java.awt.event.MouseEvent;

import javax.swing.ImageIcon;

import javax.swing.JButton;

import javax.swing.JCheckBox;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

import javax.swing.JPasswordField;

import javax.swing.JTextField;

import javax.swing.SwingConstants;

import javax.swing.UIManager;

import javax.swing.UnsupportedLookAndFeelException;

import javax.swing.border.EmptyBorder;

public class Mian_login extends JFrame {

private JPanel contentPane;

private JTextField text_LoginName;

private JPasswordField Login_password;

/**

* Launch the application.

*/

public static void main(String[] args) {

EventQueue.invokeLater(new Runnable() {

@Override

public void run() {

try {

Mian_login frame = new Mian_login();

frame.setVisible(true);

} catch (Exception e) {

e.printStackTrace();

}

}

});

}

/**

* Create the frame.

*/

public Mian_login() {

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

setBounds(500, 200, 443, 300);

setResizable(false);

setTitle("登 录");

/*获取系统按钮样式*/

String lookAndFeel = UIManager.getSystemLookAndFeelClassName();

try {

UIManager.setLookAndFeel(lookAndFeel);

} catch (ClassNotFoundException e1) {

e1.printStackTrace();

} catch (InstantiationException e1) {

e1.printStackTrace();

} catch (IllegalAccessException e1) {

e1.printStackTrace();

} catch (UnsupportedLookAndFeelException e1) {

e1.printStackTrace();

}

contentPane = new JPanel();

contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));

setContentPane(contentPane);

contentPane.setLayout(null);

JPanel panel = new JPanel();

panel.setOpaque(false);

panel.setBounds(0, 0, 434, 272);

contentPane.add(panel);

panel.setLayout(null);

JButton btn_Login = new JButton("\u767B\u5F55");

btn_Login.addMouseListener(new MouseAdapter() {

@Override

public void mouseClicked(MouseEvent e) {

}

});

btn_Login.setBounds(88, 195, 70, 23);

panel.add(btn_Login);

JButton btn_cancel = new JButton("\u53D6\u6D88");

btn_cancel.addMouseListener(new MouseAdapter() {

@Override

public void mouseClicked(MouseEvent e) {

dispose();

}

});

btn_cancel.setBounds(268, 195, 70, 23);

panel.add(btn_cancel);

JLabel lblNewLabel_name = new JLabel("\u7528\u6237\u540D");

lblNewLabel_name.setHorizontalAlignment(SwingConstants.CENTER);

lblNewLabel_name.setOpaque(true);

lblNewLabel_name.setBounds(88, 48, 70, 23);

panel.add(lblNewLabel_name);

JLabel lblNewLabel_passwd = new JLabel("\u5BC6\u7801");

lblNewLabel_passwd.setHorizontalAlignment(SwingConstants.CENTER);

lblNewLabel_passwd.setOpaque(true);

lblNewLabel_passwd.setBounds(88, 102, 70, 23);

panel.add(lblNewLabel_passwd);

JCheckBox chckbx_remember = new JCheckBox("\u8BB0\u4F4F\u5BC6\u7801");

chckbx_remember.setBounds(102, 150, 84, 23);

panel.add(chckbx_remember);

text_LoginName = new JTextField();

text_LoginName.setBounds(182, 48, 156, 23);

panel.add(text_LoginName);

text_LoginName.setColumns(10);

Login_password = new JPasswordField();

Login_password.setBounds(182, 102, 156, 23);

panel.add(Login_password);

JCheckBox chckbx_AutoLogin = new JCheckBox("\u81EA\u52A8\u767B\u5F55");

chckbx_AutoLogin.setBounds(233, 150, 84, 23);

panel.add(chckbx_AutoLogin);

JLabel Label_background = new JLabel("");

Label_background.setIcon(new ImageIcon("E:\\JAVA_workplace\\0002-\u754C\u9762\u8BBE\u8BA1\\images\\background3.jpg"));

Label_background.setBounds(0, 0, 437, 272);

contentPane.add(Label_background);

}

}