java - How to get the board without maximize then minimize -

i try make board game in java have problem in board must maximize minimize window wanted board make class of square takes color , position , 1 board

package eg.edu.guc.loa.gui;  import java.awt.borderlayout; import java.awt.color; import java.awt.component; import java.awt.gridlayout;  import javax.swing.jframe; import javax.swing.jpanel;  public class boardgui extends jframe {     public boardgui()     {         setsize(600, 600);         setvisible(true);         getcontentpane().setlayout(new gridlayout(8,8));         jpanel [][]board= new jpanel[8][8];         for(int i=0;i<8;i++)         {             for(int j=0;j<8;j++)             {                 if(i%2==0)                 {                     if(j%2==0)                     {                         board[i][j]=new square(color.black,0);                         add(board[i][j],borderlayout.center);                     }                     else                     {                         if(j%2!=0)                         {                             board[i][j]=new square(color.white,0);                             add(board[i][j],borderlayout.center);                         }                     }                 }                 else                 {                     if(i%2!=0)                     {                         if(j%2==0)                         {                             board[i][j]=new square(color.white,0);                             add(board[i][j]);                         }                         else                         {                             if(j%2!=0)                         {                             board[i][j]=new square(color.black,0);                             add(board[i][j]);                         }                 }                      }                 }              }         }      setextendedstate(getextendedstate()|jframe.maximized_both)     }      } 

and here square class

package eg.edu.guc.loa.gui;  import java.awt.color; import java.awt.graphics;  import javax.swing.jpanel;  public class square extends jpanel {     private color c;     private int x;     public square(color c,int x)     {         this.x=x;         this.c=c;     }     public void paint(graphics g)     {         super.paint(g);         g.drawrect(x,x, 80,80);         g.setcolor(c);         g.fillrect(x,x,80,80);     } }