[英]Why can't I insert my JTextField inside my JPanel?
我的 JTextField 沒有顯示,只有paintComponent
public static final int WIDTH = 800;
public static final int HEIGHT = 600;
private JTextField txt;
public Painel(){
super();
setFocusable(true);
setPreferredSize(new Dimension(WIDTH, HEIGHT));
setLayout(new FlowLayout());
txt = new JTextField();
txt.setBounds(400, 300, 50, 20);
}
您必須在文本字段中設置列數或為其提供默認文本。 以下代碼應該適合您。 我已經更新了以前的答案以使用 Gridbag 布局。 但是,您仍然需要在 JTextField 中設置列數來呈現它。
public class TestFrame extends JFrame {
public static void main(String[] args) {
new TestFrame();
}
private TestFrame() throws HeadlessException {
super();
this.setLocationByPlatform(true);
JPanel contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
GridBagLayout gbl_contentPane = new GridBagLayout();
gbl_contentPane.columnWidths = new int[] { 100, 0 };
gbl_contentPane.rowHeights = new int[] { 0, 0, 0 };
gbl_contentPane.columnWeights = new double[] { 0.0, 1.0, Double.MIN_VALUE };
gbl_contentPane.rowWeights = new double[] { 0.0, 0.0, Double.MIN_VALUE };
contentPane.setLayout(gbl_contentPane);
JTextField textField = new JTextField();
GridBagConstraints gbc_textField = new GridBagConstraints();
gbc_textField.insets = new Insets(0, 0, 5, 0);
gbc_textField.fill = GridBagConstraints.HORIZONTAL;
gbc_textField.gridx = 1;
gbc_textField.gridy = 0;
contentPane.add(textField, gbc_textField);
textField.setColumns(10);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.pack();
this.setVisible(true);
}
}
希望這可以幫助。 快樂編碼!
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