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/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone extends JFrame
{
	Ideone(){
		setTitle("졸리다..");
		setSize(300,400);
		Container c=getContentPane();
		c.setBackground(color.BLUE);
		c.add(new JButton("점심"));
		c.add(new JButton("저녁"));
		c.add(new JButton("야식"));
 
		setVisible(true);
	}
	public static void main (String[] args) throws java.lang.Exception
	{
		new Ideone();
		// your code goes here
	}
}

Main.java:8: error: cannot find symbol
class Ideone extends JFrame
                     ^
  symbol: class JFrame
Main.java:11: error: cannot find symbol
		setTitle("???..");
		^
  symbol:   method setTitle(String)
  location: class Ideone
Main.java:12: error: cannot find symbol
		setSize(300,400);
		^
  symbol:   method setSize(int,int)
  location: class Ideone
Main.java:13: error: cannot find symbol
		Container c=getContentPane();
		^
  symbol:   class Container
  location: class Ideone
Main.java:13: error: cannot find symbol
		Container c=getContentPane();
		            ^
  symbol:   method getContentPane()
  location: class Ideone
Main.java:14: error: cannot find symbol
		c.setBackground(color.BLUE);
		                ^
  symbol:   variable color
  location: class Ideone
Main.java:15: error: cannot find symbol
		c.add(new JButton("??"));
		          ^
  symbol:   class JButton
  location: class Ideone
Main.java:16: error: cannot find symbol
		c.add(new JButton("??"));
		          ^
  symbol:   class JButton
  location: class Ideone
Main.java:17: error: cannot find symbol
		c.add(new JButton("??"));
		          ^
  symbol:   class JButton
  location: class Ideone
Main.java:19: error: cannot find symbol
		setVisible(true);
		^
  symbol:   method setVisible(boolean)
  location: class Ideone
10 errors

Standard output is empty