import java.io.*;
import javax.swing.*;
import java.awt.*;

public class Sudoku {
	
	public JFrame sudokuGui = new JFrame();
	public JButton[][] squares;
	
	
	public void createGui() {
	   squares = new JButton[4][4];
	   squares[1][1].setText("1");
	   squares[1][3].setText("3");
	   squares[2][3].setText("4");
	   squares[4][2].setText("2");
	   
	   sudokuGui.setTitle("Sudokuuuuuu");
	   sudokuGui.setSize(400,400);
	   sudokuGui.setVisible(true);
	   sudokuGui.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	   
	   sudokuGui.setLayout(new GridLayout(3,3));
 
	  for(int i=0; i<4; ++i) {
		   for(int j=0; j<4; ++j){
			   sudokuGui.add(squares[i][j]);
		   }
		 }
	   
	}
	
	public Sudoku() {
		createGui();
	}
	
	public static void main(String[] args) {
      Sudoku test = new Sudoku();
	}

}