BCA JAVA 2015 SLIP 16

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

import java.awt.Color;

public class Slip16 extends JFrame implements ActionListener

{

  JButton moveBtns[]=new JButton[4];

  JPanel gridPanels[]=new JPanel[16];

  String icons[]={"Left","Up","Right","Down"};

  int cnt=1;

  Slip16()

  {

      setLayout(new GridLayout(5,4));

      for(int i=0;i<16 i="" span="">

      {

           gridPanels[i]=new JPanel();

           add(gridPanels[i]);

          gridPanels[i].setBorder(BorderFactory.createLineBorder(Color.black,1));

          gridPanels[i].setBackground(Color.blue);

      }

      gridPanels[0].setBackground(Color.black);

        for(int i=0;i<4 i="" span="">

      {

            moveBtns[i]=new JButton(icons[i]);

            add(moveBtns[i]);

            moveBtns[i].addActionListener(this);

      }

     

      setSize(300,300);

      setVisible(true);

      setTitle("Grid Example");

   }

      public void actionPerformed(ActionEvent e)

      {

            gridPanels[cnt-1].setBackground(Color.blue);

            if(e.getSource()==moveBtns[0])

            {

                  if(cnt%4!=1)

                        cnt--;

            }

            if(e.getSource()==moveBtns[1])

            {

                  if(cnt>4)

                        cnt=cnt-4;

            }

            if(e.getSource()==moveBtns[2])

            {

                  if(cnt%4!=0)

                        cnt++;

            }

            if(e.getSource()==moveBtns[3])

            {

                  if(cnt<13 span="">

                        cnt=cnt+4;

            }

            gridPanels[cnt-1].setBackground(Color.black);

      }

     

      public static void main(String args[])

      {

            new Slip16();

      }

}