Question

在我的Java程序中，当调用一个按钮时，将显示一些标签和文本字段。但是，仅显示文本字段，当我使用鼠标减小或增加帧大小时，将显示标签。

代码：

public void actionPerformed(ActionEvent e)
{

    if(e.getSource()==button)
    {

    l1= new JLabel("Name: ");
    l1.setForeground(Color.white);
    l1.setFont(new Font("Serif", Font.BOLD, 15));
    l1.setBounds(100,100,150,20);

    l2= new JLabel("Mobile Number: ");
    l2.setForeground(Color.white);
    l2.setFont(new Font("Serif", Font.BOLD, 15));
    l2.setBounds(100,150,150,20);

    l3= new JLabel("Father's Name: ");
    l3.setForeground(Color.white);
    l3.setFont(new Font("Serif", Font.BOLD, 15));
    l3.setBounds(100,200,150,20);

    l4= new JLabel("Mobile Number: ");
    l4.setForeground(Color.white);
    l4.setFont(new Font("Serif", Font.BOLD, 15));
    l4.setBounds(100,250,150,20);

    l5= new JLabel("Mother's Name: ");
    l5.setForeground(Color.white);
    l5.setFont(new Font("Serif", Font.BOLD, 15));
    l5.setBounds(100,300,150,20);

    l6= new JLabel("Mobile Number: ");
    l6.setForeground(Color.white);
    l6.setFont(new Font("Serif", Font.BOLD, 15));
    l6.setBounds(100,350,150,20);

    l7= new JLabel("Village: ");
    l7.setForeground(Color.white);
    l7.setFont(new Font("Serif", Font.BOLD, 15));
    l7.setBounds(100,400,150,20);

    l8= new JLabel("Police Station: ");
    l8.setForeground(Color.white);
    l8.setFont(new Font("Serif", Font.BOLD, 15));
    l8.setBounds(100,450,150,20);

    l9= new JLabel("District: ");
    l9.setForeground(Color.white);
    l9.setFont(new Font("Serif", Font.BOLD, 15));
    l9.setBounds(100,500,150,20);

    l10= new JLabel("Blood Group: ");
    l10.setForeground(Color.white);
    l10.setFont(new Font("Serif", Font.BOLD, 15));
    l10.setBounds(100,550,150,20);

    l11= new JLabel("Department: ");
    l11.setForeground(Color.white);
    l11.setFont(new Font("Serif", Font.BOLD, 15));
    l11.setBounds(600,100,150,20);

    l12= new JLabel("Series: ");
    l12.setForeground(Color.white);
    l12.setFont(new Font("Serif", Font.BOLD, 15));
    l12.setBounds(600,150,150,20);

    l13= new JLabel("Roll Number: ");
    l13.setForeground(Color.white);
    l13.setFont(new Font("Serif", Font.BOLD, 15));
    l13.setBounds(600,200,150,20);

    l14= new JLabel("CGPA: ");
    l14.setForeground(Color.white);
    l14.setFont(new Font("Serif", Font.BOLD, 15));
    l14.setBounds(600,250,150,20);

    l15= new JLabel("Room Number: ");
    l15.setForeground(Color.white);
    l15.setFont(new Font("Serif", Font.BOLD, 15));
    l15.setBounds(600,300,150,20);





    tf1= new JTextField();
    tf1.setBounds(300,100,200,20);

    tf2= new JTextField();
    tf2.setBounds(300,150,200,20);

    tf3= new JTextField();
    tf3.setBounds(300,200,200,20);

    tf4= new JTextField();
    tf4.setBounds(300,250,200,20);

    tf5= new JTextField();
    tf5.setBounds(300,300,200,20);

    tf6= new JTextField();
    tf6.setBounds(300,350,200,20);

    tf7= new JTextField();
    tf7.setBounds(300,400,200,20);

    tf8= new JTextField();
    tf8.setBounds(300,450,200,20);

    tf9= new JTextField();
    tf9.setBounds(300,500,200,20);

    tf10= new JTextField();
    tf10.setBounds(300,550,200,20);

    tf11= new JTextField();
    tf11.setBounds(710,100,200,20);

    tf12= new JTextField();
    tf12.setBounds(710,150,200,20);

    tf13= new JTextField();
    tf13.setBounds(710,200,200,20);

    tf14= new JTextField();
    tf14.setBounds(710,250,200,20);

    tf15= new JTextField();
    tf15.setBounds(710,300,200,20);



    tf1.setEditable(false);
    tf2.setEditable(false);
    tf3.setEditable(false);

    tf4.setEditable(false);
    tf5.setEditable(false);
    tf6.setEditable(false);

    tf7.setEditable(false);
    tf8.setEditable(false);
    tf9.setEditable(false);

    tf10.setEditable(false);
    tf11.setEditable(false);
    tf12.setEditable(false);

    tf13.setEditable(false);
    tf14.setEditable(false);
    tf15.setEditable(false);






    try {  

        Class.forName("com.mysql.jdbc.Driver");  

        Connection con=DriverManager.getConnection(  
        "jdbc:mysql://localhost:3306/hostel_management","root","");  

        //here project is database name, root is username and password is empty 

        Statement stmt=con.createStatement();  

        ResultSet rs=stmt.executeQuery("select * from student_info where roll_no = '" + textfield.getText() + "'");  

        //if(rs.next()=null)
            //JOptionPane.showMessageDialog(null, "No Available Seat. Please Select Another Room.", "Warning", JOptionPane.ERROR_MESSAGE);
        int count= 0;










        while(rs.next())  
        {

             count++;


             tf1.setText(rs.getString(1));
             tf1.setHorizontalAlignment(JTextField.CENTER);

             tf2.setText(rs.getString(2));
             tf2.setHorizontalAlignment(JTextField.CENTER);

             tf3.setText(rs.getString(3));
             tf3.setHorizontalAlignment(JTextField.CENTER);

             tf4.setText(rs.getString(4));
             tf4.setHorizontalAlignment(JTextField.CENTER);

             tf5.setText(rs.getString(5));
             tf5.setHorizontalAlignment(JTextField.CENTER);

             tf6.setText(rs.getString(6));
             tf6.setHorizontalAlignment(JTextField.CENTER);

             tf7.setText(rs.getString(7));
             tf7.setHorizontalAlignment(JTextField.CENTER);

             tf8.setText(rs.getString(8));
             tf8.setHorizontalAlignment(JTextField.CENTER);

             tf9.setText(rs.getString(9));
             tf9.setHorizontalAlignment(JTextField.CENTER);

             tf10.setText(rs.getString(10));
             tf10.setHorizontalAlignment(JTextField.CENTER);

             tf11.setText(rs.getString(11));
             tf11.setHorizontalAlignment(JTextField.CENTER);

             tf12.setText(rs.getString(12));
             tf12.setHorizontalAlignment(JTextField.CENTER);

             tf13.setText(rs.getString(13));
             tf13.setHorizontalAlignment(JTextField.CENTER);

             tf14.setText(rs.getString(14));
             tf14.setHorizontalAlignment(JTextField.CENTER);

             tf15.setText(rs.getString(15));
             tf15.setHorizontalAlignment(JTextField.CENTER)

            add(l1);
              add(tf1);
              add(l2);
              add(tf2);
              add(l3);
              add(tf3);
              add(l4);
              add(tf4);
              add(l5);
              add(tf5);
              add(l6);
              add(tf6);
              add(l7);
              add(tf7);
              add(l8);
              add(tf8);
              add(l9);
              add(tf9);
              add(l10);
              add(tf10);
              add(l11);
              add(tf11);
              add(l12);
              add(tf12);
              add(l13);
              add(tf13);
              add(l14);
              add(tf14);
              add(l15);
              add(tf15);



                add(frame_imagelabel);

        }

屏幕截图在1

下面给出

Answer 1

也许问题是不要为标签设置目标。你应该this method - label.setLabelFor(target)。因此，请尝试修改代码并为每个标签添加此代码：

l1= new JLabel("Name: ");
l1.setForeground(Color.white);
l1.setFont(new Font("Serif", Font.BOLD, 15));
l1.setBounds(100,100,150,20);
l1.setLabelFor(targetTextField)

Answer 2

解决的代码使用pack（）...全部：:) ...

bin/debug

Answer 3

我无法评论，所以我会回答。如果我是你，我会像Label.java一样创建一个类创建一个获取所有必要数据的构造函数：

private JLabel label;
private Color fg;
private Font font;
private Rectangle rect;

public Label(String name, Color foreground, Font font, Rectangle rect){
    this.label = new JLabel(name);
    this.label.setForeground(foreground);
    this.label.setFont(font);
    this.label.setBounds(rect);
}

和一个存储所有标签的arraylist，只需使用forloop加载它们，它会使代码看起来更清晰

ArrayList<Label> labels = new ArrayList<Label>();
labels.add(new Label("Name: ", Color.white, new Font("Serif", Font.BOLD, 15), new Rectangle(100, 100, 150, 20)));
labels.add(new Label("Mobile Number: ", Color.white, new Font("Serif", Font.BOLD, 15), new Rectangle(100, 150, 150, 20)));
/*.
  .
  .*/

Answer 4

您要添加背景框架，最后应首先添加背景，然后添加标签，按钮等

setLayout(new BorderLayout());
setContentPane(new JLabelnew ImageIcon(getClass().getResource("image.jpg"))));

首先将您的背景图像复制并粘贴到src文件夹中，然后再添加此背景代码，然后添加标签，按钮等。我建议您使用布局而不是边界

为什么标签不显示在框架中？

4 个答案: