GridLayout
这样做,它在一个网格中布局组件,其中每个单元格是基于要求的可用空间的百分比(即宽度/列和高度/行)。
查看A Visual Guide to Layout Managers,了解基本布局管理器及其功能的示例。
我会建议你看一下GridBagLayout
。它是默认库中最灵活(也是最复杂)的布局管理器。
例如
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import javax.swing.JComboBox;
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 TestLayout31 {
public static void main(String[] args) {
new TestLayout31();
}
public TestLayout31() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
public TestPane() {
JLabel lblRes = new JLabel("Resident Name");
JLabel lblRoomNo = new JLabel("RoomNo");
JLabel lblAge = new JLabel("Age");
JLabel lblGender = new JLabel("Gender");
JLabel lblCare = new JLabel("Care level");
JTextField fldRes = new JTextField("john smith", 20);
JTextField fldRoomNo = new JTextField(10);
JComboBox cmbAge = new JComboBox(new Object[]{51});
JComboBox cmbGener = new JComboBox(new Object[]{"M", "F"});
JComboBox cmbCare = new JComboBox(new Object[]{"Low"});
setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.anchor = GridBagConstraints.WEST;
gbc.insets = new Insets(1, 1, 1, 1);
add(lblRes, gbc);
gbc.gridx++;
gbc.gridwidth = 4;
gbc.fill = GridBagConstraints.HORIZONTAL;
add(fldRes, gbc);
gbc.gridx = 7;
gbc.gridwidth = 1;
gbc.fill = GridBagConstraints.NONE;
add(lblRoomNo, gbc);
gbc.gridx++;
add(fldRoomNo, gbc);
gbc.gridy++;
gbc.gridx = 1;
add(lblAge, gbc);
gbc.gridx++;
add(cmbAge, gbc);
gbc.gridx++;
add(lblGender, gbc);
gbc.gridx++;
add(cmbGener, gbc);
gbc.gridx++;
gbc.gridwidth = 2;
add(lblCare, gbc);
gbc.gridx += 2;
gbc.gridwidth = GridBagConstraints.REMAINDER;
add(cmbCare, gbc);
}
}
}
复合布局示例
另一种选择是使用复合布局。也就是说,您将 UI 的每个部分分成单独的容器,专注于它们各自的布局要求。
例如,您有两行字段,每行并不真正相互关联,因此与其试图弄清楚如何使字段对齐,您可以分别关注每一行......
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import javax.swing.JComboBox;
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 TestLayout31 {
public static void main(String[] args) {
new TestLayout31();
}
public TestLayout31() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
public TestPane() {
JPanel topPane = new JPanel(new GridBagLayout());
JLabel lblRes = new JLabel("Resident Name");
JLabel lblRoomNo = new JLabel("RoomNo");
JLabel lblAge = new JLabel("Age");
JLabel lblGender = new JLabel("Gender");
JLabel lblCare = new JLabel("Care level");
JTextField fldRes = new JTextField("john smith", 20);
JTextField fldRoomNo = new JTextField(10);
JComboBox cmbAge = new JComboBox(new Object[]{51});
JComboBox cmbGener = new JComboBox(new Object[]{"M", "F"});
JComboBox cmbCare = new JComboBox(new Object[]{"Low"});
setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.anchor = GridBagConstraints.WEST;
gbc.insets = new Insets(1, 1, 1, 1);
topPane.add(lblRes, gbc);
gbc.gridx++;
gbc.fill = GridBagConstraints.HORIZONTAL;
topPane.add(fldRes, gbc);
gbc.gridx++;
topPane.add(lblRoomNo, gbc);
gbc.gridx++;
topPane.add(fldRoomNo, gbc);
JPanel bottomPane = new JPanel(new GridBagLayout());
gbc.gridx = 0;
bottomPane.add(lblAge, gbc);
gbc.gridx++;
bottomPane.add(cmbAge, gbc);
gbc.gridx++;
bottomPane.add(lblGender, gbc);
gbc.gridx++;
bottomPane.add(cmbGener, gbc);
gbc.gridx++;
bottomPane.add(lblCare, gbc);
gbc.gridx++;
bottomPane.add(cmbCare, gbc);
gbc.gridx = 0;
gbc.gridy = 0;
gbc.weightx = 1;
gbc.fill = GridBagConstraints.HORIZONTAL;
add(topPane, gbc);
gbc.gridy++;
add(bottomPane, gbc);
}
}
}
如果您必须...