Java将按钮动态添加为数组

Question

可能重复:
java - 如何在点击时动态地将swing组件添加到gui？

我想动态添加按钮数组.我试过这样的:

this.pack();
    Panel panel = new Panel();
    panel.setLayout(new FlowLayout());
    this.add(panel);
    panel.setVisible(true);
    for (int i = 0; i < Setting.length; i++) {
        for (int j = 0; j < Setting.width; j++) {
            JButton b = new JButton(i+"");
            b.setSize(30, 30);
            b.setLocation(i * 30, j * 30);
            panel.add(b);
            b.setVisible(true);
        }
    }

但没有得到任何东西,我犯了什么错误？

编辑

我有jFrame类"选择",我有一个按钮,当我按下按钮时,这应该发生:

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
        // TODO add your handling code here:
       structure.Setting s = new Setting(8, 8, 3, 1, 1);
       Game g = new Game();
       g.setSetting(s);
       this.dispose();
       g.show();
    }

然后我去了函数setSetting的Game类(也是jFrame类),它是这样的:

void setSetting(Setting s) {
        this.setting = s;
        structure.Game game = new structure.Game(setting);
        JPanel panel = new JPanel(new GridLayout(5, 5, 4, 4));
        for (int i = 1; i <= 5; i++) {
            for (int j = 1; j <= 5; j++) {
                JButton b = new JButton(String.valueOf(i));
                panel.add(b);
            }
        }
        add(panel);
        pack();
        setVisible(true);
    }
    structure.Setting setting;
}

Answer 1

您可以使用GridLayout添加相等高度/宽度的按钮：

public class Game extends JFrame {
    private JPanel panel;
    public Game(int rows,int cols,int hgap,int vgap){
        panel=new JPanel(new GridLayout(rows, cols, hgap, vgap));
        for(int i=1;i<=rows;i++)
        {
            for(int j=1;j<=cols;j++)
            {
                JButton btn=new JButton(String.valueOf(i));
                panel.add(btn);
            }
        }
        add(panel);
        pack();
        setVisible(true);
    }
}

按钮处理程序中的代码应该是：

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
   Game g = new Game(5,5,3,3);
}

请注意，您还可以Setting通过Game构造函数传递对象引用（当您可以动态添加小部件时）而不是调用setSetting方法。