Java，时间测试的程序，增加一秒，增加一分钟，增加一天，有部分代码，剩余的怎么写，路过的各位大佬帮忙看看 // Lab 1: // Lab 1: TimeTest4.java
// Program adds validation to Fig. 8.7 example
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class TestTime3 extends JApplet implements ActionListener {
private Time3 time;
private JLabel hourLabel, minuteLabel, secondLabel;
private JTextField hourField, minuteField, secondField, displayField;
private JButton tickButton;

// Create Time3 object and set up GUI
public void init()
{
time = new Time3();

Container container = getContentPane();
container.setLayout( new FlowLayout() );

// set up hourLabel and hourField
hourLabel = new JLabel( "Set Hour" );
hourField = new JTextField( 10 );
hourField.addActionListener( this );
container.add( hourLabel );
container.add( hourField );

// set up minuteLabel and