我使用了网格袋约束，当我使用插入物添加可以正常工作的间距时，但是当我使用gridx和gridy设置位置时，什么也没发生。我刚刚在下面发布了整个代码，不知道这是否有帮助，谢谢
import javax.swing.*;import java.awt.BorderLayout;import java.awt.CardLayout;importjava.awt.Color;import java.awt.GridBagConstraints;import java.awt.GridBagLayout;import java.awt.Insets;import java.awt.event.ActionEvent;importjava.awt.event.ActionListener;importjavax.swing.ImageIcon import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JScrollPane;importjavax.swing.JTree;import javax.swing.tree.DefaultMutableTreeNode;import javax.swing.tree.DefaultTreeModel;public class MyWizard {
private JFrame frame = new JFrame("My Wizard");
private JPanel panelContainer = new JPanel();
private JPanel panelFirst = new JPanel();
private JPanel panelSecond = new JPanel();
private JPanel panelThird = new JPanel();
private JPanel panelButton = new JPanel(new GridBagLayout());
private JButton btNext = new JButton ("Next");
private JButton btNextTwo = new JButton ("Next");
private JButton btNextThree = new JButton("Next");
private JRadioButton btLdap, btKerbegos, btSpnego, btSaml2;
private JCheckBox btSan, btNFS, btYUMserver;
private CardLayout c1 = new CardLayout();
private JScrollPane scrollPane;
private JLabel lblPicture, lblPictureTwo;
DefaultMutableTreeNode root = new DefaultMutableTreeNode("FMW Components");
public MyWizard() {
//tree code
final DefaultMutableTreeNode accessibility =
add(root, "DB Tier", true);
add(accessibility, "RAC", false);
add(accessibility, "Gateways", false);
add(accessibility, "Datavault", false);
add(accessibility, "Agent", false);
add(accessibility, "Custom Databases", false);
root.add(accessibility);
final DefaultMutableTreeNode browsing =
new DefaultMutableTreeNode("APP Tier");
add(browsing, "IDM (OID, OVD)", false);
add(browsing, "IAM (Access Manager)", false);
add(browsing, "BIEE", false);
add(browsing, "Forms and Reports", false);
add(browsing, "Discoverer", false);
add(browsing, "Apps", false);
add(browsing, "Apex(4.2.1)", false);
root.add(browsing);
final DefaultTreeModel treeModel = new DefaultTreeModel(root);
final JTree tree = new JTree(treeModel);
final CheckBoxNodeRenderer renderer = new CheckBoxNodeRenderer();
tree.setCellRenderer(renderer);
final CheckBoxNodeEditor editor = new CheckBoxNodeEditor(tree);
tree.setCellEditor(editor);
tree.setEditable(true);
scrollPane = new JScrollPane(tree);
//tree code ends
panelFirst.setLayout(null);
panelSecond.setLayout(null);
panelThird.setLayout(new BorderLayout());
panelContainer.setLayout(c1);
panelFirst.add(btNext);
panelSecond.add(btNextTwo);
GridBagConstraints gbc = new GridBagConstraints();
gbc.insets = new Insets(5,5,5,5);
//this is not working
gbc.gridx = 1;
gbc.gridy = 0;
panelButton.add(btNextThree, gbc);
panelThird.add(scrollPane, BorderLayout.CENTER);
panelThird.add(panelButton, BorderLayout.SOUTH);
panelFirst.setBackground(Color.white);
panelSecond.setBackground(Color.white);
panelContainer.add(panelFirst, "1");
panelContainer.add(panelSecond,"2");
panelContainer.add(panelThird,"3");
c1.show(panelContainer, "1");
btNext.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
c1.show(panelContainer,"2");
}
});
btNextTwo.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
c1.show(panelContainer,"3");
}
});
RadioButtons();
Button();
Buttons();
CheckList();
groupButton();
Image();
frame.add(panelContainer);
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.pack();
frame.setSize(400,310);
frame.setVisible(true);
}
public void RadioButtons() {
btLdap = new JRadioButton ("Ldap");
btLdap.setBounds(60,85,100,20);
btLdap.setBackground(Color.white);
panelFirst.add(btLdap);
btKerbegos = new JRadioButton ("Kerbegos");
btKerbegos.setBounds(60,115,100,20);
btKerbegos.setBackground(Color.white);
panelFirst.add(btKerbegos);
btSpnego =new JRadioButton("Spnego");
btSpnego.setBounds(60,145,100,20);
btSpnego.setBackground(Color.white);
panelFirst.add(btSpnego);
btSaml2 = new JRadioButton("Saml2");
btSaml2.setBounds(60,175,100,20);
btSaml2.setBackground(Color.white);
panelFirst.add(btSaml2);
}
public void Button() {
btNext.setBounds(250,240,100,20);
}
public void CheckList () {
btSan = new JCheckBox ("San");
btSan.setBounds(60,85,100,20);
btSan.setBackground(Color.white);
panelSecond.add(btSan);
btNFS = new JCheckBox ("NFS");
btNFS.setBounds(60,115,100,20);
btNFS.setBackground(Color.white);
panelSecond.add(btNFS);
btYUMserver =new JCheckBox("Spnego");
btYUMserver.setBounds(60,145,100,20);
btYUMserver.setBackground(Color.white);
panelSecond.add(btYUMserver);
}
public void Buttons() {
btNextTwo.setBounds(250,240,100,20);
}
public void Image() {
ImageIcon image = new ImageIcon("iconpic.png");
lblPicture = new JLabel(image);
lblPicture.setBounds(140,5, 330, 270);
panelFirst.add(lblPicture);
ImageIcon imageTwo = new ImageIcon("iconpic.png");
lblPictureTwo = new JLabel(imageTwo);
lblPictureTwo.setBounds(140,5, 330, 270);
panelSecond.add(lblPictureTwo);
}
private void groupButton() {
ButtonGroup bg1 = new ButtonGroup( );
bg1.add(btLdap);
bg1.add(btKerbegos);
bg1.add(btSpnego);
bg1.add(btSaml2);
}
private static DefaultMutableTreeNode add(
final DefaultMutableTreeNode parent, final String text,
final boolean checked)
{
final CheckBoxNode data = new CheckBoxNode (text, checked);
final DefaultMutableTreeNode node = new DefaultMutableTreeNode(data);
parent.add(node);
return node;
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
new MyWizard();
}
});
}}
最佳答案
在我看来，您对GridBagLayout的运作方式有一些严重的误解。在当前代码中，JComponent ...中只有一个GridBagLayout，即btNextThree。
在这里将其添加到网格中。panelButton.add(btNextThree, gbc);
“目前，panelButton中的按钮位于中间，但我只是
想要将其移到最右边，什么是最好的方法？”。
您无法使用GridBagLayout做到这一点……至少不是您的想法。 GridBagLayout的Grid中的单元格只有在添加了组件后才具有大小，因此您在其中添加了btNextThree；
gbc.gridx = 1;
gbc.gridy = 0;
现在，它位于两列一行的网格的最右侧单元格中。但是，最左边的列没有大小，因为里面只有潜在的空间。因此，内部带有
btNextThree的右列将占用所有可用空间。因此，毕竟我呀呀呀，简短的答案是您可能应该使用另一个
LayoutManager。但是，如果您想快速进行肮脏的修复，则可以创建第二个不可见的组件，其大小与btNextThree大致相同，并将其添加到最左边的列中，这样可以将它们均匀地分成两个偶数列。下面的代码应该做到这一点。GridBagConstraints gbc2 = new GridBagConstraints();
gbc2.insets = new Insets(5,5,5,5);
gbc2.gridx = 0;
gbc2.gridy = 0;
panelButton.add(jButtonThatsSetToInvisible, gbc2);
如果以后您希望它们在调整大小时在其容器中正确对齐，则可能必须使用
GridBagConstraints weight属性，但这是我认为的另一篇文章。关于java - 为什么gridbag约束不起作用，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/18231995/