java 使用 gridlayout 添加按钮
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Adding buttons using gridlayout
提问by Imri Persiado
I'm trying to create a simple tic tac toe board made by 9x9 JButtons. I used a 2d array and a gridlayout but the result is nothing, a frame without any button. What I'm doing wrong?
我正在尝试创建一个由 9x9 JButtons 制作的简单井字棋盘。我使用了一个二维数组和一个网格布局，但结果什么都没有，一个没有任何按钮的框架。我做错了什么？
import java.awt.GridLayout;
import javax.swing.*;
public class Main extends JFrame
{
private JPanel panel;
private JButton[][]buttons;
private final int SIZE = 9;
private GridLayout experimentLayout;
public Main()
{
super("Tic Tac Toe");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(500,500);
setResizable(false);
setLocationRelativeTo(null);
experimentLayout = new GridLayout(SIZE,SIZE);
panel = new JPanel();
panel.setLayout(experimentLayout);
buttons = new JButton[SIZE][SIZE];
addButtons();
add(panel);
setVisible(true);
}
public void addButtons()
{
for(int k=0;k<SIZE;k++)
for(int j=0;j<SIZE;j++)
{
buttons[k][j] = new JButton(k+1+", "+(j+1));
experimentLayout.addLayoutComponent("testName", buttons[k][j]);
}
}
public static void main(String[] args)
{
new Main();
}
}
The addButton method is adding the buttons to the array and straight after to the panel.
addButton 方法将按钮添加到数组，然后直接添加到面板。
回答by Reimeus
You need to add the buttons to your JPanel:
您需要将按钮添加到您的JPanel：
public void addButtons(JPanel panel) {
for (int k = 0; k < SIZE; k++) {
for (int j = 0; j < SIZE; j++) {
buttons[k][j] = new JButton(k + 1 + ", " + (j + 1));
panel.add(buttons[k][j]);
}
}
}
回答by Andrew Thompson
// add buttons to the panel INSTEAD of the layout
// experimentLayout.addLayoutComponent("testName", buttons[k][j]);
panel.add(buttons[k][j]);
Further advice:
进一步建议：
- Don't extend
JFrame, just keep a reference to one as long as needed. Only extend frame when adding or changing functionality.. - Instead of
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);usesetDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);as seen in this answer. - Instead of
setSize(500,500);usepanel.setPreferredSize(new Dimension(500,500));. Or better still, extendJButtonto make aSquareButtonthat returns a preferred size equal to the largest preferred of width or height. The last will ensure the GUI is the size it needs to be, square & allowing enough space to show the text. - Instead of
setLocationRelativeTo(null);usesetLocationByPlatform(true);as seen in the answer linked in point 2. - Add
pack()beforesetVisible(true);which ensures the GUI is the size it needs to be, to display the content. - Instead of
setResizable(false)callsetMinimumSize(getSize()). - Start & update the GUI on the EDT. See Concurrency in Swingfor more details.
- 不要扩展
JFrame，只要需要就保留对一个的引用。仅在添加或更改功能时扩展框架.. - 而不是在这个答案中看到的
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);使用。setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); - 而不是
setSize(500,500);使用panel.setPreferredSize(new Dimension(500,500));。或者更好的是，扩展JButton使 aSquareButton返回的首选大小等于宽度或高度的最大首选。最后一个将确保 GUI 是它需要的大小，方形并允许足够的空间来显示文本。 - 而不是在第 2 点中链接的答案中看到的
setLocationRelativeTo(null);使用setLocationByPlatform(true);。 - 添加
pack()之前setVisible(true);确保 GUI 是显示内容所需的大小。 - 而不是
setResizable(false)调用setMinimumSize(getSize())。 - 在 EDT 上启动和更新 GUI。有关更多详细信息，请参阅Swing 中的并发。
