我正在学习GridBagLayout并做了非常简单的布局，有两个非常小的混乱
1- Size of Buttons我用过New.setPreferredSize(new Dimension(70,23));是使所有按钮大小相同的标准方法
2-放置组件看起来不好
现在看到还有更多padding on all sides of components，因此如何正确放置from top left corner，我应该减小JFrame?的大小还是同时使用frame.pack();都可以，但是不知道什么是标准做法（我尝试过等），
这就是我的代码的样子
frame= new JFrame("Hello ");
frame.setSize(300, 150);
frame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
frame.addWindowListener(this);
frame.setResizable(false);
frame.setLocation(0, 0);
p1= new JPanel (new GridBagLayout());
gbc = new GridBagConstraints();
lblname= new JLabel("Name");
gbc.gridx=0;
gbc.gridy=0;
p1.add(lblname, gbc);
textname = new JTextField(11);
gbc.gridx=1;
gbc.gridy=0 ;
p1.add(textname, gbc);
New= new JButton("New");
gbc.gridx=2;
gbc.gridy=0;
New.setPreferredSize(new Dimension(70,23));
p1.add(New, gbc);
lblEmail = new JLabel("Email ");
gbc.gridx=0;
gbc.gridy=1;
p1.add(lblEmail , gbc);
TextEmail = new JTextField(11);
gbc.gridx=1;
gbc.gridy=1;
p1.add(TextEmail,gbc);
Edit = new JButton("Edit") ;
gbc.gridx= 2 ;
gbc.gridy=1;
Edit.setPreferredSize(new Dimension(70,23));
p1.add(Edit , gbc);
lblgender= new JLabel("Gender");
gbc.gridx=0;
gbc.gridy=2;
p1.add(lblgender, gbc);
TextGender= new JTextField(11);
gbc.gridx=1;
gbc.gridy=2;
p1.add(TextGender, gbc);
Gender= new JButton("Gender");
gbc.gridx=2;
gbc.gridy=2;
Gender.setPreferredSize(new Dimension(70,23));
p1.add(Gender, gbc);
pre= new JButton("<<");
gbc.gridx=0;
gbc.gridy=3;
p1.add(pre, gbc);
count = new JTextField(5);
gbc.gridx=1;
gbc.gridy=3;
p1.add(count, gbc);
next= new JButton(">>");
gbc.gridx=2;
gbc.gridy=3;
next.setPreferredSize(new Dimension(70,23));
p1.add(next, gbc);
p1.setVisible(true);
frame.add(p1);
frame.setVisible(true);
最佳答案
GridBagLayout会让您发疯，它也是JDK中最灵活的布局管理器之一。
不要害怕使用复合布局。在下面的示例中，我将导航控件移到了自己的面板上，这使定义复杂的布局变得更加容易（您也可以通过这种方式混合使用布局管理器）GridBagConstraints#fill允许您确定如何在该单元格中填充组件。您有GridBagConstraints.HORIZONTAL，GridBagConstraints.VERTICAL和GridBagConstraints.BOTH ...我认为这是自我解释。
在下面的示例中，我使用GridBagConstraints.HORIZONTAL允许按钮填充其单元格/列中的所有可用空间
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
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;
import javax.swing.border.LineBorder;
public class TestLayout20 {
public static void main(String[] args) {
new TestLayout20();
}
public TestLayout20() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException ex) {
} catch (InstantiationException ex) {
} catch (IllegalAccessException ex) {
} catch (UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame("Test");
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() {
setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.anchor = GridBagConstraints.WEST;
JLabel lblname = new JLabel("Name");
gbc.gridx = 0;
gbc.gridy = 0;
add(lblname, gbc);
JTextField textname = new JTextField(11);
gbc.gridx = 1;
gbc.gridy = 0;
add(textname, gbc);
JLabel lblEmail = new JLabel("Email ");
gbc.gridx = 0;
gbc.gridy = 1;
add(lblEmail, gbc);
JTextField TextEmail = new JTextField(11);
gbc.gridx = 1;
gbc.gridy = 1;
add(TextEmail, gbc);
JLabel lblgender = new JLabel("Gender");
gbc.gridx = 0;
gbc.gridy = 2;
add(lblgender, gbc);
JTextField TextGender = new JTextField(11);
gbc.gridx = 1;
gbc.gridy = 2;
add(TextGender, gbc);
JButton New = new JButton("New");
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.insets = new Insets(0, 12, 0, 0);
gbc.gridx = 2;
gbc.gridy = 0;
add(New, gbc);
JButton edit = new JButton("Edit");
gbc.gridx = 2;
gbc.gridy = 1;
add(edit, gbc);
JButton Gender = new JButton("Gender");
gbc.gridx = 2;
gbc.gridy = 2;
add(Gender, gbc);
JPanel pnlNav = new JPanel(new GridBagLayout());
gbc.insets = new Insets(12, 0, 0, 0);
gbc.gridx = 0;
gbc.gridy = 3;
gbc.gridwidth = GridBagConstraints.REMAINDER;
gbc.fill = GridBagConstraints.HORIZONTAL;
add(pnlNav, gbc);
JTextField count = new JTextField(5);
gbc = new GridBagConstraints();
gbc.gridx = 1;
gbc.gridy = 0;
pnlNav.add(count, gbc);
JButton pre = new JButton("<<");
gbc.anchor = GridBagConstraints.WEST;
gbc.weightx = 1;
gbc.gridx = 0;
gbc.gridy = 0;
pnlNav.add(pre, gbc);
JButton next = new JButton(">>");
gbc.anchor = GridBagConstraints.EAST;
gbc.gridx = 2;
gbc.gridy = 0;
pnlNav.add(next, gbc);
}
}
}
我强烈建议您通读How to use GridBagLayout以获取更好的解释：P
关于java - JFrame组件的大小和位置，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/15320180/