手动创建表单

Question

我正在尝试使用代码而不是设计器手动创建表单，我已经使用设计器创建了。

这是我到目前为止提出的手动代码，但我在将标签和文本字段并排排列时遇到问题

mport java.awt.*;
import javax.swing.*;
/**
 *
 * @author jackandjill
 */
public class summinup_copy extends JFrame
{
    private JLabel lblTitle, lblOctal, lblDecimal, lblMessage ;

private JTextField txtOctal, txtDecimal;

private JButton calculate_btn;




public  summinup_copy()       

{

JPanel panel = (JPanel)this.getContentPane();

panel.setLayout(new BorderLayout());

JPanel panCentre = new JPanel();

panCentre.setLayout(new GridLayout(3,3));

lblTitle = new JLabel("Area of Triangle");

lblTitle.setFont(new Font("Arial", 1, 20));

lblTitle.setHorizontalAlignment(JLabel.CENTER);

lblOctal = new JLabel("Octal");

lblOctal.setHorizontalAlignment(JLabel.CENTER) ;

//lblDecimal = new JLabel("Decimal");
//
//lblDecimal.setHorizontalAlignment(JLabel.CENTER);

lblMessage = new JLabel("Result will be displayed here");

lblMessage.setForeground(Color.red);

lblMessage.setHorizontalAlignment(JLabel.CENTER);

txtOctal = new JTextField("0", 5);

txtOctal.setHorizontalAlignment(JLabel.CENTER); 
//txtDecimal = new JTextField("0", 5);
//
//txtDecimal.setHorizontalAlignment(JLabel.CENTER);

calculate_btn = new JButton("Calculate Area");



//AHandlerClass aListener = new AHandlerClass() ;

//btnOtoD.addActionListener(aListener);

//btnDtoO.addActionListener(aListener);

panCentre.add(lblOctal);

//panCentre.add(lblDecimal);

panCentre.add(txtOctal);

//panCentre.add(txtDecimal);

panCentre.add(calculate_btn);

//panCentre.add(btnDtoO);

panel.add(lblTitle, BorderLayout.NORTH);

panel.add(lblMessage,BorderLayout.SOUTH);


panel.add(panCentre, BorderLayout.CENTER);

}

public static void main(String args[]) {

summinup_copy myGui = new summinup_copy();

myGui.setTitle("Bharath");

myGui.setSize(400, 200);

myGui.setVisible(true);
}

}

Answer 1

正如您已经想到的那样，在手动编写Swing GUI时必须使用LayoutManagers。以下是一些链接，可以帮助您确定哪个LayoutManager适合给定的外观：

http://docs.oracle.com/javase/tutorial/uiswing/layout/visual.html

http://docs.oracle.com/javase/tutorial/uiswing/layout/using.html

为了将JLabel放在JTextField或其他组件旁边，我通常使用GridLayout或GridBagLayout。我发现需要大量的试验和错误才能让组件看起来像我想要的那样。通常，您必须拥有多层嵌入式JPanel才能使其正确。