java - Board's squares wont appear. -

i have 3 classes: 1 main:

public class thera {     public static void main(string[] args) {         theragui start = new theragui();     }  } 

one gui

public class theragui extends jframe {     public theragui(){         board board = new board();         this.setlayout(new gridbaglayout());         this.settitle("thera");         this.setdefaultcloseoperation(jframe.exit_on_close);         this.setvisible(true);         this.add(board);         this.pack();     } } 

and last board:

package thera; import java.awt.*; import java.awt.event.*; import java.util.*; import javax.swing.*;  public class board extends jpanel {   jlayeredpane layeredpane;   jpanel board;   jlabel piece;   int xadj;   int yadj;   private static final string imagefolderpath = "src/resources/images/";   dimension dimension = new dimension(500, 500);    public board(){       //create layered pane         layeredpane = new jlayeredpane();       layeredpane.setpreferredsize(dimension);       this.add(layeredpane);    //create board   board = new jpanel();   board.setlayout(new gridlayout(7,9));   board.setpreferredsize(dimension);    layeredpane.add(board, jlayeredpane.default_layer);    for(int c = 0; c < 7; c++){       for(int r = 0; r < 9; r++){           jpanel square = new jpanel();            square.setlayout(new borderlayout());           square.setbackground(new color(255, 204, 051));           board.add(square);       }   }   }   } 

my problem: board won't appear! additional info: primary layout gridbaglayout, , in cell 1 added jpanel, inside jpanel added layeredpane.

you're adding component (thus changing hierarchy) after setting visibility. swing kinda pedantic how things work.

public class theragui extends jframe {     public theragui(){         board board = new board();         this.setlayout(new gridbaglayout());         this.settitle("thera");         this.setdefaultcloseoperation(jframe.exit_on_close);         // note order         this.add(board);         this.pack();         this.setvisible(true);     } }