在两位版主大人的帮助下，终于完成了定时启动器了

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.*;
import java.util.*;
import java.text.*;
import java.io.IOException;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.filechooser.*;
import javax.swing.event.*;
import java.util.Date;
import java.util.Calendar;

public class Timing extends JFrame implements ActionListener {
    boolean task1 = true, task2 = true;
    JPanel jp = new JPanel();

    JButton jb1 = new JButton("浏览");

    JButton jb2 = new JButton("确定");

    JButton jb3 = new JButton("浏览");

    JLabel jl1 = new JLabel("运行时间");

    JLabel jl2 = new JLabel("时");

    JLabel jl3 = new JLabel("分");

    JLabel jl4 = new JLabel("秒");

    JLabel jl5 = new JLabel("运行时间");

    JLabel jl6 = new JLabel("时");

    JLabel jl7 = new JLabel("分");

    JLabel jl8 = new JLabel("秒");

    JLabel jl[] = new JLabel[] { jl1, jl2, jl3, jl4, jl5, jl6, jl7, jl8 };

    JTextArea jta1 = new JTextArea();

    JTextArea jta2 = new JTextArea();

    JTextArea jta3 = new JTextArea();

    JTextArea jta4 = new JTextArea();

    JTextArea jta5 = new JTextArea();

    JTextArea jta6 = new JTextArea();

    JTextArea jta7 = new JTextArea();

    JTextArea jta8 = new JTextArea();

    JTextArea jta[] = new JTextArea[] { jta1, jta2, jta3, jta4, jta5, jta6,
            jta7, jta8 };

    JFileChooser fileChooser = new JFileChooser("E:\\");

    public class alarm extends Thread {
        

        public void run() {
            while (task1 == true || task2 == true) {
                Calendar cal = Calendar.getInstance();
                if (task1==true&&(cal.get(Calendar.HOUR_OF_DAY) == Integer.valueOf(
                        jta1.getText().toString()).intValue()
                        && cal.get(Calendar.MINUTE) == Integer.valueOf(
                                jta2.getText().toString()).intValue()
                        && cal.get(Calendar.SECOND) == Integer.valueOf(
                                jta3.getText().toString()).intValue())) {
                    String strCommand = jta4.getText().toString();
                    try {
                        task1 = false;
                        Thread.sleep(1000);
                        Runtime.getRuntime().exec(strCommand);

                    } catch (Exception ex) {

                    }
                }
                if (task2==true&&(cal.get(Calendar.HOUR_OF_DAY) == Integer.valueOf(
                        jta5.getText().toString()).intValue()
                        && cal.get(Calendar.MINUTE) == Integer.valueOf(
                                jta6.getText().toString()).intValue()
                        && cal.get(Calendar.SECOND) == Integer.valueOf(
                                jta7.getText().toString()).intValue())) {
                    String strCommand = jta8.getText().toString();
                    try {
                        task2 = false;
                        Thread.sleep(1000);
                        Runtime.getRuntime().exec(strCommand);

                    } catch (Exception ex) {

                    }
                }
            }
            System.exit(0);
        }
    }

    public Timing() {
        // TODO Auto-generated constructor stub
        jp.setLayout(null);
        jp.add(jb1);
        jp.add(jb2);
        jp.add(jb3);
        jb1.addActionListener(this);
        jb2.addActionListener(this);
        jb3.addActionListener(this);
        for (int i = 0; i < jl.length; i++) {
            jp.add(jl[i]);
            jp.add(jta[i]);
            jta[i].setEditable(true);
        }
        jl1.setBounds(10, 10, 60, 20);
        jta1.setBounds(80, 10, 40, 20);
        jl2.setBounds(130, 10, 20, 20);
        jta2.setBounds(160, 10, 40, 20);
        jl3.setBounds(210, 10, 20, 20);
        jta3.setBounds(240, 10, 40, 20);
        jl4.setBounds(290, 10, 20, 20);
        jta4.setBounds(10, 40, 300, 20);
        jb1.setBounds(320, 40, 80, 20);
        jb2.setBounds(10, 130, 80, 20);
        jl5.setBounds(10, 70, 60, 20);
        jta5.setBounds(80, 70, 40, 20);
        jl6.setBounds(130, 70, 20, 20);
        jta6.setBounds(160, 70, 40, 20);
        jl7.setBounds(210, 70, 20, 20);
        jta7.setBounds(240, 70, 40, 20);
        jl8.setBounds(290, 70, 20, 20);
        jta8.setBounds(10, 100, 300, 20);
        jb3.setBounds(320, 100, 80, 20);
        fileChooser.removeChoosableFileFilter(fileChooser
                .getChoosableFileFilters()[0]);
        fileChooser.addChoosableFileFilter(new FileNameExtensionFilter(".exe",
                "exe"));
        this.add(jp);
        this.setTitle("定时启动器");
        this.setBounds(110, 110, 500, 200);
        this.setVisible(true);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    }

    public void actionPerformed(ActionEvent e) {

        if (e.getSource() == jb1) {
            fileChooser.showOpenDialog(this);
            String path = fileChooser.getSelectedFile().getPath().toString();
            jta4.setText(path);

        }
        if (e.getSource() == jb3) {
            fileChooser.showOpenDialog(this);
            String path = fileChooser.getSelectedFile().getPath().toString();
            jta8.setText(path);

        }
        if (e.getSource() == jb2) {
            if (jta1.getText().equals("") || jta2.getText().equals("")
                    || jta3.getText().equals("") || jta4.getText().equals("")) {
                JOptionPane.showMessageDialog(this, "请输入完整的信息", "错误",
                        JOptionPane.INFORMATION_MESSAGE);
            } else{if (jta5.getText().equals("") && jta6.getText().equals("")
                    && jta7.getText().equals("") && jta8.getText().equals("")) {
                task2 = false;
            }
                alarm al = new alarm();
                al.start();
            }
        }
    }

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        new Timing();
    }

}

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