[英]How can I align the JLabel to the left of the panel
我想將所有JLabel對齊到面板的左側。 以下是我的代碼,但無法正常工作,我不知道為什么。 JFrame frame1 =新的JFrame(“注冊乘客”); frame1.setVisible(真); frame1.setSize(550,200);
JPanel panel = new JPanel();
frame1.add(panel);
JLabel label1 = new JLabel("Name",SwingConstants.LEFT);
JLabel label2 = new JLabel("Activities",SwingConstants.LEFT);
JButton jbtReg = new JButton("Register");
panel.add(label1);
panel.add(text1);
panel.add(label2);
panel.add(text2);
panel.add(jbtReg);
根據您的示例,您可以使用
JPanel panel = new JPanel(new FlowLayout(FlowLayout.LEFT));
但這會將所有組件向左對齊。
您還可以考慮使用其他布局管理器或布局管理器的組合嗎?
查看更多關於布局管理器的視覺指南
更新
FlowLayout
(這是JPanel
的默認布局管理器)沒有給您很多選擇,而是考慮嘗試使用其他布局管理器或布局管理器的組合,例如...
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class LayoutExample {
public static void main(String[] args) {
new LayoutExample();
}
public LayoutExample() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
public TestPane() {
setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.anchor = GridBagConstraints.WEST;
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.gridx = 0;
gbc.gridy = 0;
add(new JLabel("Name:"), gbc);
gbc.gridy++;
add(new JLabel("Activity:"), gbc);
gbc.gridx++;
gbc.gridy = 0;
gbc.fill = GridBagConstraints.NONE;
add(new JTextField(10), gbc);
gbc.gridy++;
add(new JTextField(20), gbc);
gbc.gridx = 0;
gbc.gridy++;
gbc.anchor = GridBagConstraints.CENTER;
gbc.gridwidth = 2;
add(new JButton("Register"), gbc);
}
}
}
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