import javax.swing.*; //07ppt23-26事件响应
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.*;
import java.util.Calendar;
import java.util.GregorianCalendar;
public class realtime extends JFrame {
JFrame j=new JFrame();
JPanel p=new JPanel();
JButton gett=new JButton("现在时间");
JLabel h=new JLabel();
JLabel m=new JLabel();
JLabel s=new JLabel();
public realtime(){
j.setSize(800,800);
j.add(p);
p.add(h);
p.add(m);
p.add(s);
p.add(gett);
j.setVisible(true);
j.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
gett.addActionListener(new gettListener());
}
public void gtime(){
Calendar now= new GregorianCalendar();
int nowh= now.get(Calendar.HOUR_OF_DAY);
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