如何删除标签和文本字段之间的空格
我想要输出如图1所示，但我得到的输出如图2所示从我的代码中显示我错了。如何删除jLabel1和jTextfield1以及jLabel2和jPasswordField1之间的空格？
在图片代码下方发布，请指出错误，因为我正在学习如何使用GridBagConstraints。
IMG1
IMG2
这是代码
public login()
{
jPanelC=new JPanel();
jlabel1=new JLabel("User ID");
jlabel2=new JLabel("Password");
jlabel3=new JLabel("Password");
jid=new JTextField(15);
jid.setPreferredSize(new Dimension(100, 100));
jpass=new JPasswordField(15);
jpass.setPreferredSize(new Dimension(100, 100));
jbutton1=new JButton("Login");
jbutton1.setPreferredSize(new Dimension(100, 100));
jPanelC.setBackground(new java.awt.Color(204, 204, 255));
jPanelC.setBorder(empty);
int eb=5;
jPanelC.setBorder(BorderFactory.createCompoundBorder(
BorderFactory.createEmptyBorder(eb, eb, eb, eb), // outer border
BorderFactory.createLoweredBevelBorder())); // inner border
jPanelC.setSize(300, 150);
jPanelC.setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 0;
c.gridy = 0;
jPanelC.add(jlabel1,c);
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx =1;
c.gridy = 0;
c.weightx=2;
jPanelC.add(jid,c);
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 0;
c.gridy = 1;
jPanelC.add(jlabel2,c);
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 1;
c.gridy = 1;
jPanelC.add(jpass,c);
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 0;
c.gridy = 2;
c.gridheight=1;
c.gridwidth = 3;
jPanelC.add(jbutton1,c);
jPanelE=new JPanel();
jPanelW=new JPanel();
jPanelN=new JPanel();
jPanelS=new JPanel();
add(jPanelE,BorderLayout.EAST);
add(jPanelW,BorderLayout.WEST);
add(jPanelN,BorderLayout.NORTH);
add(jPanelS,BorderLayout.SOUTH);
add(jPanelC,BorderLayout.CENTER);
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setTitle("Login Console");
setBackground(new java.awt.Color(255, 255, 255));
setSize(400, 300);
this.setVisible(true);
}
public static void main(String[] args)
{
login log=new login();
}
}
2 个答案:
答案 0 :(得分：3)
我不会设置绝对大小。由于你想在登录字段周围有一个空边框，我会通过嵌套JPanel来做到这一点。我也喜欢创建一个实用工具方法（我认为它应该是静态的，因为它不会改变类状态）来帮助我创建我的GridBagConstraints，类似于......
import java.awt.Dialog.ModalityType;
import java.awt.Font;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import javax.swing.*;
public class Login2 extends JPanel {
private static final String TITLE = "Login For Authorized User";
private static final int COLS = 15;
private static final int PREF_W = 300;
private static final int PREF_H = 200;
private JTextField field1 = new JTextField();
private JPasswordField passField = new JPasswordField();
public Login2() {
field1.setColumns(COLS);
passField.setColumns(COLS);
JPanel inPanel = new JPanel(new GridBagLayout());
JLabel titleLabel = new JLabel(TITLE, SwingConstants.CENTER);
titleLabel.setFont(titleLabel.getFont().deriveFont(Font.BOLD));
inPanel.add(titleLabel, createGbc(0, 0, 2, 1));
inPanel.add(new JLabel(" "), createGbc(0, 1, 2, 1));
inPanel.add(new JLabel("User ID:"), createGbc(0, 2, 1, 1));
inPanel.add(field1, createGbc(1, 2, 1, 1));
inPanel.add(new JLabel("Password:"), createGbc(0, 3, 1, 1));
inPanel.add(passField, createGbc(1, 3, 1, 1));
inPanel.add(new JLabel(" "), createGbc(0, 4, 1, 1));
inPanel.add(new JButton("Login"), createGbc(1, 4, 1, 1));
int ebT = 15;
int ebL = 15;
int ebB = 15;
int ebR = 15;
inPanel.setBorder(BorderFactory.createEmptyBorder(ebT, ebL, ebB, ebR));
add(inPanel);
}
private static GridBagConstraints createGbc(int x, int y, int w, int h) {
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = x;
gbc.gridy = y;
gbc.gridwidth = w;
gbc.gridheight = h;
gbc.weightx = 1.0;
gbc.weighty = 1.0;
if (w == 1 && x == 0) {
gbc.insets = new Insets(5, 5, 5, 10);
} else {
gbc.insets = new Insets(5, 5, 5, 5);
}
gbc.fill = GridBagConstraints.HORIZONTAL;
return gbc;
}
private static void createAndShowGui() {
Login2 loginPanel = new Login2();
JFrame frame = new JFrame("Main GUI");
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
// frame.getContentPane().add(mainPanel);
frame.pack();
frame.setLocationByPlatform(true);
// frame.setVisible(true);
JDialog dialog = new JDialog(frame, "Login", ModalityType.APPLICATION_MODAL);
dialog.add(loginPanel);
dialog.setResizable(false);
dialog.pack();
dialog.setLocationByPlatform(true);
dialog.setVisible(true);
frame.dispose();
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGui();
}
});
}
}
答案 1 :(得分：2)
在构造函数中使用它。如果您需要了解有关间距的更多信息，请查看here
中的Insets
jPanelC = new JPanel();
jlabel1 = new JLabel("User ID");
jlabel2 = new JLabel("Password");
jid = new JTextField(15);
// jid.setPreferredSize(new Dimension(100, 100));
jpass = new JPasswordField(15);
// jpass.setPreferredSize(new Dimension(100, 100));
jbutton1 = new JButton("Login");
// jbutton1.setPreferredSize(new Dimension(100, 100));
jPanelC.setBackground(new java.awt.Color(204, 204, 255));
jPanelC.setBorder(empty);
int eb = 5;
jPanelC.setBorder(BorderFactory.createCompoundBorder(BorderFactory.createEmptyBorder(eb, eb, eb, eb), // outer
// border
BorderFactory.createLoweredBevelBorder())); // inner border
jPanelC.setSize(300, 150);
jPanelC.setLayout(new GridBagLayout());
panelU = new JPanel(new GridBagLayout());
panelU.setBackground(new java.awt.Color(204, 204, 255));
GridBagConstraints c = new GridBagConstraints();
c.fill = GridBagConstraints.NONE;
c.anchor = GridBagConstraints.CENTER;
c.gridx = 0;
c.gridy = 0;
c.weightx = 1.0;
c.weighty = 1.0;
c.insets = new Insets(5, 5, 5, 5);
panelU.add(jlabel1, c);
c.fill = GridBagConstraints.NONE;
c.anchor = GridBagConstraints.CENTER;
c.gridx = 2;
c.gridy = 0;
c.weightx = 1.0;
c.weighty = 1.0;
c.insets = new Insets(5, 5, 5, 5);
panelU.add(jid, c);
c.fill = GridBagConstraints.NONE;
c.anchor = GridBagConstraints.CENTER;
c.gridx = 0;
c.gridy = 1;
c.weightx = 1.0;
c.weighty = 1.0;
c.insets = new Insets(5, 5, 5, 5);
panelU.add(jlabel2, c);
c.fill = GridBagConstraints.NONE;
c.anchor = GridBagConstraints.CENTER;
c.gridx = 2;
c.gridy = 1;
c.weightx = 1.0;
c.weighty = 1.0;
c.insets = new Insets(5, 5, 5, 5);
panelU.add(jpass, c);
c.fill = GridBagConstraints.CENTER;
c.anchor = GridBagConstraints.CENTER;
c.gridx = 0;
c.gridy = 2;
c.insets = new Insets(5, 5, 5, 5);
c.gridheight = 1;
c.gridwidth = 2;
GridBagConstraints c1 = new GridBagConstraints();
c1.gridx = 0;
c1.gridy = 0;
c1.gridwidth = 1;
c1.gridheight = 1;
c1.weightx = 0.0;
c1.weighty = 0.0;
c1.insets = new Insets(5, 5, 5, 5);
c1.fill = GridBagConstraints.NONE;
c1.anchor = GridBagConstraints.CENTER;
jPanelC.add(panelU, c1);
c1.gridx = 0;
c1.gridy = 1;
c1.gridwidth = 1;
c1.gridheight = 1;
c1.weightx = 0.0;
c1.weighty = 0.0;
c1.insets = new Insets(5, 5, 5, 5);
c1.fill = GridBagConstraints.NONE;
c1.fill = GridBagConstraints.CENTER;
jPanelC.add(jbutton1, c1);
jPanelE = new JPanel();
jPanelW = new JPanel();
jPanelN = new JPanel();
jPanelS = new JPanel();
add(jPanelE, BorderLayout.EAST);
add(jPanelW, BorderLayout.WEST);
add(jPanelN, BorderLayout.NORTH);
add(jPanelS, BorderLayout.SOUTH);
add(jPanelC, BorderLayout.CENTER);
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setTitle("Login Console");
setBackground(new java.awt.Color(255, 255, 255));
setSize(400, 300);
this.setVisible(true);
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