用java编程 输入两个数 分别放两个label中 最后在text中输入结果用一个bottom判断结果是否正确

如题

可不可以说清楚点，那两个数，进行的是什么运算呢

import java.awt.FlowLayout; import java.awt.event.*; import javax.swing.*; public class test { public static void main(String args[]) { String input = JOptionPane.showInputDialog("请输入2个数，空格隔开:"); if ( input == null || input.matches("[^\\d\\s\\.]+") ) { JOptionPane.showMessageDialog(null, "输入有误!"); return; } final String[] s = input.split("\\s+"); if ( s.length != 2 ) { JOptionPane.showMessageDialog(null, "输入有误!"); return; } JFrame f = new JFrame("add"); JLabel l1 = new JLabel(s[0]); JLabel l0 = new JLabel(" + "); JLabel l2 = new JLabel(s[1]); JButton b = new JButton("Is it right?"); final JTextField tf = new JTextField(); tf.setColumns(10); f.add(l1); f.add(l0); f.add(l2); f.add(tf); f.add(b); b.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { double a = Double.parseDouble(s[0]); double b = Double.parseDouble(s[1]); double c = Double.parseDouble(tf.getText()); if ( a + b != c ) { JOptionPane.showMessageDialog(null, "你做错了!"); } else { JOptionPane.showMessageDialog(null, "恭喜,正确!"); } } }); f.setSize(300, 300); f.setLocation(300, 300); f.setLayout(new FlowLayout(FlowLayout.CENTER, 50, 0)); f.setVisible(true); } } By M：好像什么也没改嘛- -.....