第一个Java界面程序

     做了一个很简单的界面程序,也是我第一个界面程序.主要功能就是输入两个数字,计算这两个数字的和,很简单的功能,我却花了很久,对java太不熟悉了,连得到textField1中用户输入的值怎么获得,都不知道,后来baidu才知道,

     用 textField1.getText()获得输入的值;,

     设定某个值则是 textField3.setText();

     将String转化成整形用 Integer.parseInt(string1);

     相反则是 String.valueOf(c) 

     主要代码贴下,给自己留个纪念.import java.awt.*; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.*; public class Com extends JFrame implements ActionListener { /** * @param args */ JButton button = new JButton("="); JTextField textField1 = new JTextField(5); JTextField textField2 = new JTextField(5); JTextField textField3 = new JTextField(5); JLabel label1 = new JLabel("请输入: "); JLabel label2 = new JLabel("+"); public static void main(String[] args) { // TODO Auto-generated method stub Com com = new Com(); com.init(); com.setVisible(true); } public void init() { this.setSize(400, 300); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); this.setResizable(false); this.setTitle("简单计算程序"); this.setLocation(400, 250); JPanel jPanel = new JPanel(); jPanel.setBackground(Color.white); jPanel.setPreferredSize(new Dimension(300, 300)); this.getContentPane().add(jPanel, BorderLayout.CENTER); jPanel.add(label1); jPanel.add(textField1); jPanel.add(label2); jPanel.add(textField2); jPanel.add(button); button.addActionListener(this); jPanel.add(textField3); } public void actionPerformed(ActionEvent e) { Object object = e.getSource(); if (object == button) { String string1 = textField1.getText(); String string2 = textField2.getText(); if (string1.trim().length() == 0 || string2.trim().length() == 0) { JOptionPane.showMessageDialog(this, "请先输入值!", "系统提示", JOptionPane.ERROR_MESSAGE); } else { int a, b, c; a = Integer.parseInt(string1); b = Integer.parseInt(string2); c = a + b; textField3.setText(String.valueOf(c)); } } }