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import java.awt.BorderLayout;
import java.awt.FlowLayout;
import javax.swing.*;

public class FileCutter
{
    public static void main(String[] args)
    {
        CutterWindow cw = new CutterWindow();
        cw.setResizable(false);
        cw.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        cw.setVisible(true);
    }
}

class CutterWindow extends JFrame
{
    private JTabbedPane tabbedPane = new JTabbedPane();

    public static final int DEFAULT_WIDTH = 470;
    public static final int DEFAULT_HEIGHT = 480;
    public CutterWindow()
    {
        this.setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
        tabbedPane.add("File Cut",new FileCutPanel());
        this.add(tabbedPane);
    }

}

class FileCutPanel extends JPanel
{   
    private JLabel lblFileName =  new JLabel("File Name:");
    private JTextField txtFileName = new JTextField();
    private JLabel lblFileSize = new JLabel("File Size:");
    private JTextField txtFileSize = new JTextField();
    private JButton btnViewFiles = new JButton("...");

    private JPanel panelSelectOperatingFile = new JPanel();

    public FileCutPanel()
    {   
        panelSelectOperatingFile.setLayout(new FlowLayout());
        panelSelectOperatingFile.add(lblFileName);
        txtFileName.setColumns(20);
        txtFileName.setEditable(false);
        panelSelectOperatingFile.add(txtFileName);
        panelSelectOperatingFile.add(btnViewFiles);
        panelSelectOperatingFile.add(lblFileSize);
        panelSelectOperatingFile.add(txtFileSize);
        txtFileSize.setColumns(20);
        txtFileSize.setEditable(false);

        this.add(panelSelectOperatingFile);
    }
}

结果是panelSelectOperatingFile面板中的五个组件在同一行并且超出了窗口的宽度。而且我知道 JPanel 的默认布局是flowlayout，我希望当上一行没有空间时，组件将放在下一行。我试图找出问题所在，但我做不到

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1 回答 1

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不要使用panelSelectOperatingFile面板。只需将您的组件添加到JPanel您正在扩展的组件中。

您不能嵌套 FlowLayout。原因如下：

Oracle FlowLayout 教程

于 2011-10-18T10:34:42.590 回答