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SetSize does not affect button size

I have an example code:

import java.awt.*;
import javax.swing.*;
import javax.swing.border.BevelBorder;

public class AWT extends JFrame {

    public static void main(String[] args) {
        final JFrame frame = new JFrame();
        frame.setPreferredSize(new Dimension(600, 450));
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setBackground(Color.green.darker());

        Button btn_1 = new Button("Button 1");
        btn_1.setBackground(Color.green.darker());
        btn_1.setSize(40, 100);
        Button btn_2 = new Button("Button 2");
        btn_2.setBackground(Color.green.darker());
        btn_2.setSize(40, 100);
        Button btn_3 = new Button("Button 3");
        btn_3.setBackground(Color.green.darker());
        btn_3.setSize(40, 100);

        JPanel players = new JPanel(new GridLayout(1, 3));
        players.add(btn_1);
        players.add(btn_2);
        players.add(btn_3);
        players.setBackground(Color.green.darker());
        players.setPreferredSize(new Dimension(450, 80));

        JPanel game = new JPanel();
        game.setBorder(BorderFactory.createBevelBorder(BevelBorder.LOWERED));
        game.setBackground(Color.green);
        game.setPreferredSize(new Dimension(600, 370));

        JPanel content = new JPanel();
        content.setLayout(new BorderLayout());
        frame.setContentPane(content);
        content.add(players, BorderLayout.NORTH);
        content.add(game, BorderLayout.SOUTH);
        frame.pack();
 frame.setVisible(true);
    }
}

As a result, this gives me a window like this:

alt text http://img710.imageshack.us/img710/1573/21672037.gif

while this should lead to something more similar:

alt text http://img686.imageshack.us/img686/8948/44650673.gif

Why is this not done this way?

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2 answers

GridLayoutignores preferred button size. Replace

JPanel players = new JPanel(new GridLayout(1, 3));

with

JPanel players = new JPanel(); // default FlowLayout

Addendum: Here is an example related to the fact that the layout and preferred dimensions are executed by default. Having specified as few restrictions as possible, the appearance is configured for each type of platform when called pack().

import java.awt.*;
import javax.swing.*;
import javax.swing.border.BevelBorder;

public class AWT extends JFrame {

    public static void main(String[] args) {
        final JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JPanel players = new JPanel();
        players.add(new GameButton("Button 1"));
        players.add(new GameButton("Button 2"));
        players.add(new GameButton("Button 3"));
        players.setBackground(GameButton.color);

        JPanel game = new JPanel();
        game.setBorder(BorderFactory.createBevelBorder(BevelBorder.LOWERED));
        game.setBackground(Color.green);
        game.setPreferredSize(new Dimension(600, 450));

        JPanel content = new JPanel();
        content.setLayout(new BorderLayout());
        frame.setContentPane(content);
        content.add(players, BorderLayout.NORTH);
        content.add(game, BorderLayout.CENTER);
        frame.pack();
        frame.setVisible(true);
    }

    private static class GameButton extends JButton {

        private static final Color color = Color.green.darker();
        private static final Font font = new Font("SanSerif", Font.BOLD, 20);
        private String name;

        public GameButton(String name) {
            super(name);
            this.setBackground(color);
            this.setFont(font);
        }
    }
}
+6
source

  • GridLayout , . , , GridLayout .

  • setPreferredSize ! (. )

import java.awt.*;

import javax.swing.*;
import javax.swing.border.BevelBorder;

public class AWT extends JFrame {

public static void main(String[] args) {
final JFrame frame = new JFrame();
frame.setPreferredSize(new Dimension(600, 450));
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setBackground(Color.green.darker());

Button btn_1 = new Button("Button 1");
btn_1.setBackground(Color.green.darker());
btn_1.setPreferredSize(new Dimension(40, 100)); 

Button btn_2 = new Button("Button 2");
btn_2.setBackground(Color.green.darker());
btn_2.setPreferredSize(new Dimension(40, 100)); 

Button btn_3 = new Button("Button 3");
btn_3.setBackground(Color.green.darker());
btn_3.setPreferredSize(new Dimension(40, 100));    

GridLayout layout = new GridLayout(1, 3);
JPanel players = new JPanel(layout);
JPanel cell1 = new JPanel();
cell1.add(btn_1);
cell1.setBackground(Color.green.darker());
players.add(cell1);
JPanel cell2 = new JPanel();
cell2.add(btn_2);
cell2.setBackground(Color.green.darker());
players.add(cell2);
JPanel cell3 = new JPanel();
cell3.add(btn_3);
cell3.setBackground(Color.green.darker());
players.add(cell3);
players.setBackground(Color.green.darker());
players.setPreferredSize(new Dimension(450, 80));

JPanel game = new JPanel();
game.setBorder(BorderFactory.createBevelBorder(BevelBorder.LOWERED));
game.setBackground(Color.green);
game.setPreferredSize(new Dimension(600, 370));

JPanel content = new JPanel();
content.setLayout(new BorderLayout());
frame.setContentPane(content);
content.add(players, BorderLayout.NORTH);
content.add(game, BorderLayout.SOUTH);
frame.pack();
frame.setVisible(true);
}
}
+2

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