的setSize不影响按键的大小 [英] setSize not influencing size of button

问题描述

我有一个样品code：

I have a sample 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);
    }
}

这结果给了我这样一个窗口：

This as a result gives me such a window :

，而应该导致更多的东西是这样的：

, while it should result in something more like this :

为什么它不以这种方式呈现？

Why it is not rendering in this way ?

推荐答案

网​​格布局忽略按钮'preferred大小。替换

GridLayout ignores the buttons' preferred size. Replace

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

与

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

附录：这里是让布局和默认preferred尺寸做的工作的一个相关的例子。通过指定作为约束很少越好，外观调整到每个平台的外观和放大器;觉得当包（）被调用。

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);
        }
    }
}

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