在框架上放置GUI对象 [英] Positioning GUI objects on a Frame
问题描述
我正在开发Java应用程序,希望在定位一些Labels和TextFields方面获得帮助.
I am developing a Java application and would like some help in positioning some Labels and TextFields.
这是我的代码:
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JComboBox;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JTextField;
import java.awt.BorderLayout;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.FlowLayout;
public class AuctionClient
{
public AuctionClient()
{
JFrame GUIFrame = new JFrame();
JPanel GUIPanel = new JPanel();
JLabel LabelUserName = new JLabel("UserName:");
JTextField TextFieldUserName = new JTextField(" ");
JLabel LabelPassword = new JLabel("Password:");
JTextField TextFieldPassword = new JTextField(" ");
GUIFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
GUIFrame.setTitle("Auction Client");
GUIFrame.setSize(500,250);
GUIFrame.setLocationRelativeTo(null);
GUIPanel.add(LabelUserName);
GUIPanel.add(TextFieldUserName);
GUIPanel.add(LabelPassword);
GUIPanel.add(TextFieldPassword);
GUIFrame.add(GUIPanel, BorderLayout.NORTH);
GUIFrame.setVisible(true);
}
}
使用上面的代码,LabelPassword和TextFieldPassword与LabelUsername和TextFieldUsername在同一行.我可以帮忙将LabelPassword和TextFieldPassword放在新行上吗?是否可以指定X,Y坐标在JFrame上定位对象?
With the above code, the LabelPassword and TextFieldPassword is on the same line as the LabelUsername and TextFieldUsername. Can I please have some help to position the LabelPassword and TextFieldPassword on a new line. Is it possible to specify X,Y coordinates to position objects on a JFrame?
这是一张图片,向您展示当前如何显示对象:
Here is an image to show you how the objects are currently being shown:
http://canning.co.nz/Java/Positioning_Image.png
推荐答案
永远不要尝试使用坐标定位组件.宁可使用适当的LayoutManager's
并使用逻辑条件和约束来定位组件.
You should never try to position components with coordinates. Rather use appropriate LayoutManager's
and use logical conditions and constraints to position your components.
以下是使用GridBagLayout
的一个示例:
Here is one example using GridBagLayout
:
import java.awt.BorderLayout;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
public class AuctionClient {
public AuctionClient() {
JFrame guiFrame = new JFrame();
JPanel guiPanel = new JPanel(new GridBagLayout());
JLabel userNameLabel = new JLabel("UserName:");
JTextField userNameTextField = new JTextField(30);
JLabel passwordLabel = new JLabel("Password:");
JTextField passwordTextField = new JPasswordField(30);
guiFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
guiFrame.setTitle("Auction Client");
guiFrame.setSize(500, 250);
guiFrame.setLocationRelativeTo(null);
GridBagConstraints labelGBC = new GridBagConstraints();
labelGBC.insets = new Insets(3, 3, 3, 3);
GridBagConstraints fieldGBC = new GridBagConstraints();
fieldGBC.insets = new Insets(3, 3, 3, 3);
fieldGBC.gridwidth = GridBagConstraints.REMAINDER;
guiPanel.add(userNameLabel, labelGBC);
guiPanel.add(userNameTextField, fieldGBC);
guiPanel.add(passwordLabel, labelGBC);
guiPanel.add(passwordTextField, fieldGBC);
guiFrame.add(guiPanel, BorderLayout.NORTH);
guiFrame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
new AuctionClient();
}
});
}
}
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