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  1. import java.awt.Color;
  2. import java.awt.Dimension;
  3. import java.awt.Font;
  4. import java.awt.Graphics;
  5. import java.awt.event.ActionEvent;
  6. import java.awt.event.ActionListener;
  7. import java.util.Calendar;
  8.  
  9. import javax.swing.JFrame;
  10. import javax.swing.JPanel;
  11. import javax.swing.Timer;
  12. import javax.swing.WindowConstants;
  13.  
  14. public class SimpleDigitalClock {
  15.  
  16.     public static void main(String[] args) {
  17.  
  18.         JFrame f = new JFrame();
  19.         f.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
  20.         DigitalClock myClock = new DigitalClock();
  21.         f.add(myClock);
  22.         f.pack();
  23.         f.setVisible(true);
  24.     }
  25.  
  26.     static class DigitalClock extends JPanel {
  27.  
  28.         String stringTime;
  29.         int hour, minute, second;
  30.  
  31.         String correctionHour = "";
  32.         String correctionMinute = "";
  33.         String correctionSecond = "";
  34.  
  35.         public void setStringTime(String xyz) {
  36.             this.stringTime = xyz;
  37.         }
  38.  
  39.         public int findMinimumBetweenTwoNumbers(int a, int b) {
  40.             return (a <= b) ? a : b;
  41.         }
  42.  
  43.         DigitalClock() {
  44.  
  45.             Timer t1 = new Timer(1000, new ActionListener() {
  46.                 public void actionPerformed(ActionEvent e) {
  47.  
  48.                     repaint();
  49.                 }
  50.             });
  51.             t1.start();
  52.         }
  53.  
  54.         @Override
  55.         public void paintComponent(Graphics g) {
  56.             super.paintComponent(g);
  57.  
  58.             Calendar now = Calendar.getInstance();
  59.             hour = now.get(Calendar.HOUR_OF_DAY);
  60.             minute = now.get(Calendar.MINUTE);
  61.             second = now.get(Calendar.SECOND);
  62.  
  63.             if (hour < 12) {
  64.                 this.correctionHour = "1";
  65.             }
  66.             if (hour >= 12) {
  67.                 this.correctionHour = "";
  68.             }
  69.  
  70.             if (minute < 12) {
  71.                 this.correctionMinute = "5";
  72.             }
  73.             if (minute >= 12) {
  74.                 this.correctionMinute = "";
  75.             }
  76.  
  77.             if (second < 12) {
  78.                 this.correctionSecond = "7";
  79.             }
  80.             if (second >= 12) {
  81.                 this.correctionSecond = "";
  82.             }
  83.             setStringTime(correctionHour + hour + ":" + correctionMinute+ minute + ":" + correctionSecond + second);
  84.             g.setColor(Color.BLACK);
  85.             int length = findMinimumBetweenTwoNumbers(this.getWidth(),this.getHeight());
  86.             Font myFont = new Font("SansSerif", Font.PLAIN, length / 5);
  87.             g.setFont(myFont);
  88.             g.drawString(stringTime, (int) length/6, length/2);
  89.  
  90.         }
  91.  
  92.         @Override
  93.         public Dimension getPreferredSize() {
  94.             return new Dimension(200, 200);
  95.         }
  96.  
  97.     }
  98.  
  99. }
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
Main.java:14: error: class SimpleDigitalClock is public, should be declared in a file named SimpleDigitalClock.java
public class SimpleDigitalClock {
       ^
1 error
stdout
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Standard output is empty
https://ideone.com/DAU9BY
language:
Java (HotSpot 12)
created:
6 years ago
visibility:
public

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