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Java 创建jbutton的行和列

java swing button

Java 创建jbutton的行和列,java,swing,button,layout-manager,Java,Swing,Button,Layout Manager,我的任务是创建3组座椅，每组有3行10列座椅。首先，我为三套座椅分别创建了一个座椅，现在我正尝试使用布局管理器以3x10样式显示座椅（即JButtons）。以下是我的代码： public class ConcertPanel extends JPanel { private JPanel Panel1; private JButton goldSeat; private JButton silverSeat; private JButton bronzeSeat;

我的任务是创建3组座椅，每组有3行10列座椅。首先，我为三套座椅分别创建了一个座椅，现在我正尝试使用布局管理器以3x10样式显示座椅（即
JButtons
）。以下是我的代码：

public class ConcertPanel extends JPanel
{
    private JPanel Panel1;
    private JButton goldSeat;
    private JButton silverSeat;
    private JButton bronzeSeat;


   ConcertPanel()
   {   
        Panel1 = new JPanel();
        Panel1.setSize(500,500);

                setLayout(new GridLayout(rows, cols));
                for(int i = 0; i < rows; i++)
                for(int j = 0; j < cols; j++)
            {
                goldSeat = new JButton();
                silverSeat = new JButton();
                bronzeSeat = new JButton();
                add(new JButton());
            }
                this.add(Panel1);

       }
}

公共类ConcertPanel扩展了JPanel
{
私人JPanel小组1；
二等兵吉布顿金席；
私人朱布顿银座；
私人杰布顿青铜色座椅；
专家小组（）
{   
Panel1=新的JPanel（）；
面板1.设置尺寸（500500）；
setLayout（新网格布局（行、列））；
对于（int i=0；i
现在我在jpanel中只得到了30个按钮，它们不在行或列中？帮助：（

请再次查看：

  • 您希望将GridLayout设置为容器一次
  • 使用GridLayout添加组件时，添加组件（JButton）时没有第二个参数
  • 如果布局应为3 x 10，则需要将30个组件添加到此容器中
  • 您正在使用JPanel将另一个JPanel panel1添加到GridLayout，它将成为网格的一部分。您似乎不想这样做
例如：

导入java.awt.GridLayout；
导入javax.swing.*；
公共类GridLayoutEg扩展了JPanel{
私有静态最终整数行=3；
专用静态最终整数COLS=10；
公共网格布局EG（）{
setLayout（新的GridLayout（行、列））；//设置JPanel的布局
对于（int i=0；icreateAndShowGui（））；
}
私有静态void createAndShowGui（）{
GridLayoutEg主面板=新建GridLayoutEg（）；
JFrame=新JFrame（“GridLayoutEg”）；
frame.setDefaultCloseOperation（JFrame.DISPOSE_ON_CLOSE）；
添加框架（主面板）；
frame.pack（）；
frame.setLocationByPlatform（真）；
frame.setVisible（true）；
}
}
编辑 有关此代码的问题，请参见注释：

    for (int i = 0; i < rows; i++)
        for (int j = 0; j < cols; j++) {
            goldSeat = new JButton();   // button created but never added
            silverSeat = new JButton(); // button created but never added
            bronzeSeat = new JButton(); // button created but never added
            add(new JButton()); // only button added
        }
    this.add(Panel1); // this throws off the whole GridLayout since it's added to the grid

import java.awt.Color;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;

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

public class GridLayoutEg extends JPanel {
    private static final long serialVersionUID = 1L;
    private static final int ROWS = 3;
    private static final int COLS = 10;

    public GridLayoutEg() {
        int gap = 1;
        int gap2 = 2;
        setBorder(BorderFactory.createEmptyBorder(gap2, gap2, gap2, gap2));
        setLayout(new GridLayout(ROWS, COLS, gap, gap)); // set JPanel's layout
        for (int row = 0; row < ROWS; row++) {
            for (int col = 0; col < COLS; col++) {
                JButton button = createSeat(row, col);
                add(button); // add component w/o a 2nd parameter
            }
        }
    }

    private JButton createSeat(int row, int col) {
        SeatColor seatColor = SeatColor.values()[row];
        SeatAction seatAction = new SeatAction(seatColor, col);
        JButton button = new JButton(seatAction);
        button.setBackground(seatColor.getColor());
        int topGap = 8;
        int sideGap = 25;
        Border innerBorder = BorderFactory.createEmptyBorder(topGap, sideGap, topGap, sideGap);
        Border outerBorder = BorderFactory.createBevelBorder(BevelBorder.RAISED, seatColor.getColor().brighter(),
                seatColor.getColor().darker());
        Border border = BorderFactory.createCompoundBorder(outerBorder, innerBorder);
        button.setBorder(border);
        return button;
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(() -> createAndShowGui());
    }

    private static void createAndShowGui() {
        GridLayoutEg mainPanel = new GridLayoutEg();
        JFrame frame = new JFrame("GridLayoutEg");
        frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
        frame.add(mainPanel);
        frame.pack();
        frame.setLocationByPlatform(true);
        frame.setVisible(true);
    }
}

class SeatAction extends AbstractAction {
    private static final long serialVersionUID = 1L;
    private SeatColor seatColor;
    private int column;

    public SeatAction(SeatColor seatColor, int column) {
        super(String.format("[%d]", column));
        this.seatColor = seatColor;
        this.column = column;
        // putValue(LARGE_ICON_KEY, createIcon(seatColor, column));
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        AbstractButton btn = (AbstractButton) e.getSource();
        btn.setBackground(seatColor.getColor().brighter());
        setEnabled(false);

        String text = String.format("Selected Seat Color: %s; Column: %d", seatColor, column);
        System.out.println(text );
    }
}

enum SeatColor {
    GOLD("Gold", new Color(255, 215, 0)), 
    SILVER("Silver", new Color(192, 192, 192)), 
    BRONZE("Bronze", new Color(205, 127, 50));

    private String text;
    private Color color;

    private SeatColor(String text, Color color) {
        this.text = text;
        this.color = color;
    }

    public String getText() {
        return text;
    }

    public Color getColor() {
        return color;
    }

    @Override
    public String toString() {
        return getText();
    }

}

for（int i=0；i
因此，在我们的嵌套for循环中，您创建了3个JButton，但由于它们从未添加到GUI中，因此它们没有任何用途，实际上将被垃圾收集，除了最后创建的3个。然后您创建一个按钮并添加它。最后您创建了一个JPanel，但使用JPanel将其添加到GridLayout中，这将丢弃网格

使用此代码获得更多乐趣：

    for (int i = 0; i < rows; i++)
        for (int j = 0; j < cols; j++) {
            goldSeat = new JButton();   // button created but never added
            silverSeat = new JButton(); // button created but never added
            bronzeSeat = new JButton(); // button created but never added
            add(new JButton()); // only button added
        }
    this.add(Panel1); // this throws off the whole GridLayout since it's added to the grid

import java.awt.Color;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;

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

public class GridLayoutEg extends JPanel {
    private static final long serialVersionUID = 1L;
    private static final int ROWS = 3;
    private static final int COLS = 10;

    public GridLayoutEg() {
        int gap = 1;
        int gap2 = 2;
        setBorder(BorderFactory.createEmptyBorder(gap2, gap2, gap2, gap2));
        setLayout(new GridLayout(ROWS, COLS, gap, gap)); // set JPanel's layout
        for (int row = 0; row < ROWS; row++) {
            for (int col = 0; col < COLS; col++) {
                JButton button = createSeat(row, col);
                add(button); // add component w/o a 2nd parameter
            }
        }
    }

    private JButton createSeat(int row, int col) {
        SeatColor seatColor = SeatColor.values()[row];
        SeatAction seatAction = new SeatAction(seatColor, col);
        JButton button = new JButton(seatAction);
        button.setBackground(seatColor.getColor());
        int topGap = 8;
        int sideGap = 25;
        Border innerBorder = BorderFactory.createEmptyBorder(topGap, sideGap, topGap, sideGap);
        Border outerBorder = BorderFactory.createBevelBorder(BevelBorder.RAISED, seatColor.getColor().brighter(),
                seatColor.getColor().darker());
        Border border = BorderFactory.createCompoundBorder(outerBorder, innerBorder);
        button.setBorder(border);
        return button;
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(() -> createAndShowGui());
    }

    private static void createAndShowGui() {
        GridLayoutEg mainPanel = new GridLayoutEg();
        JFrame frame = new JFrame("GridLayoutEg");
        frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
        frame.add(mainPanel);
        frame.pack();
        frame.setLocationByPlatform(true);
        frame.setVisible(true);
    }
}

class SeatAction extends AbstractAction {
    private static final long serialVersionUID = 1L;
    private SeatColor seatColor;
    private int column;

    public SeatAction(SeatColor seatColor, int column) {
        super(String.format("[%d]", column));
        this.seatColor = seatColor;
        this.column = column;
        // putValue(LARGE_ICON_KEY, createIcon(seatColor, column));
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        AbstractButton btn = (AbstractButton) e.getSource();
        btn.setBackground(seatColor.getColor().brighter());
        setEnabled(false);

        String text = String.format("Selected Seat Color: %s; Column: %d", seatColor, column);
        System.out.println(text );
    }
}

enum SeatColor {
    GOLD("Gold", new Color(255, 215, 0)), 
    SILVER("Silver", new Color(192, 192, 192)), 
    BRONZE("Bronze", new Color(205, 127, 50));

    private String text;
    private Color color;

    private SeatColor(String text, Color color) {
        this.text = text;
        this.color = color;
    }

    public String getText() {
        return text;
    }

    public Color getColor() {
        return color;
    }

    @Override
    public String toString() {
        return getText();
    }

}

导入java.awt.Color；
导入java.awt.GridLayout；
导入java.awt.event.ActionEvent；
导入javax.swing.*；
导入javax.swing.border.BevelBorder；
导入javax.swing.border.border；
公共类GridLayoutEg扩展了JPanel{
私有静态最终长serialVersionUID=1L；
私有静态最终整数行=3；
专用静态最终整数COLS=10；
公共网格布局EG（）{
int gap=1；
int-gap2=2；
setboorder（BorderFactory.createEmptyBorder（gap2，gap2，gap2，gap2））；
setLayout（新的GridLayout（行、列、间隙、间隙））；//设置JPanel的布局
对于（int row=0；rowcreateAndShowGui（））；
}
私有静态void createAndShowGui（）{
GridLayoutEg主面板=新建GridLayoutEg（）；
JFrame=新JFrame（“GridLayoutEg”）；
frame.setDefaultCloseOperation（JFrame.DISPOSE_ON_CLOSE）；
添加框架（主面板）；
frame.pack（）；
frame.setLocationByPlatform（真）；
frame.setVisible（true）；
}
}
类SeatAction扩展了AbstractAction{
私有静态最终长serialVersionUID=1L；
私人SeatColor SeatColor；
私有int列；
公共SeatAction（SeatColor SeatColor，int列）{
super（String.format（“[%d]”，column））；
this.seatColor=seatColor；
this.column=列；
//putValue（大图标键，createIcon（seatColor，列））；
}
@凌驾
已执行的公共无效操作（ActionEvent