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  1. import javax.swing.*;
  2. import java.awt.*;
  3.  
  4. public class Gradation extends JFrame {
  5.  
  6.     public static void main(String[] args) {
  7.         Gradation gradation = new Gradation("グラデーション");
  8.         gradation.setVisible(true);
  9.     }
  10.  
  11.     Gradation(String title) {
  12.         setTitle(title);
  13.         setSize(450, 450);
  14.         setLocationRelativeTo(null);
  15.         setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  16.  
  17.         JPanel panel = new JPanel();
  18.         GridLayout layout = new GridLayout(16, 16, 2, 2);
  19.         panel.setLayout(layout);
  20.  
  21.         for (int i = 0; i < 16 * 16; i++) {
  22.             JLabel label = new JLabel();
  23.             label.setBackground(new Color(0, 0, i));
  24.             label.setOpaque(true);
  25.             panel.add(label);
  26.         }
  27.  
  28.         getContentPane().add(panel, BorderLayout.CENTER);
  29.     }
  30.  
  31. }
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:4: error: class Gradation is public, should be declared in a file named Gradation.java
public class Gradation extends JFrame {
       ^
1 error
stdout
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Standard output is empty
https://ideone.com/dOpqKd
language:
Java (HotSpot 12)
created:
6 years ago
visibility:
secret

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