我已经编写了一个简单的swing gui。但是，我的问题是我的桌子在页面的底部。我想在按钮下方留出一些空间，并在底部留出更多空间。这是一个简短的程序，我在做什么：
public class minimumExample extends JFrame {
private JTabbedPane tabbedPane;
private FilteredTabPanel filteredTabPanel;
public void createTabBar() {
tabbedPane = new JTabbedPane(JTabbedPane.TOP);
filteredTabPanel = new FilteredTabPanel();
tabbedPane.addTab("Test", filteredTabPanel.createLayout());
add(tabbedPane);
tabbedPane.setTabLayoutPolicy(JTabbedPane.SCROLL_TAB_LAYOUT);
}
private void makeLayout() {
setTitle("Test App");
setLayout(new BorderLayout());
setPreferredSize(new Dimension(1000, 500));
createTabBar();
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
pack();
setVisible(true);
}
public void start() {
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
makeLayout();
}
});
}
public static void main(String[] args) throws IOException {
minimumExample ex = new minimumExample();
ex.start();
}
public class FilteredTabPanel extends JPanel {
private JPanel selectionArea;
private JLabel lCity;
private JComboBox cityBox;
private JTable filterTable;
String[] columnNames = {"Cities"};
String[][] data = {
{"NY"}, {"NY"}, {"NY"}, {"NY"}, {"LA"}, {"LA"},{"Columbia"},{"DC"},{"DC"},{"DC"},{"DC"},{"DC"},{"DC"}
};
private JScrollPane scrollPane;
public JPanel createLayout() {
JPanel panel = new JPanel(new GridLayout(0, 1));
//add panels to the layout
panel.add(addButtons());
panel.add(showTable());
repaint();
revalidate();
return panel;
}
public JPanel addButtons(){
selectionArea = new JPanel(new FlowLayout(FlowLayout.LEFT));
lCity = new JLabel("City");
String[] fillings = {"NY", "LA", "Columbia", "DC"};
cityBox = new JComboBox(fillings);
cityBox.addActionListener(new ActionListener() {
private String cityFilter;
@Override
public void actionPerformed(ActionEvent arg0) {
//2. get data
cityFilter = cityBox.getSelectedItem().toString();
}
});
selectionArea.add(lCity);
selectionArea.add(cityBox);
selectionArea.repaint();
return selectionArea;
}
private JScrollPane showTable() {
filterTable =new JTable(data, columnNames);
filterTable.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
scrollPane = new JScrollPane(filterTable);
scrollPane.repaint();
scrollPane.validate();
return scrollPane;
}
}
}
页面外观如下：
任何建议如何解决？
最佳答案
您想要做的是嵌套简单的布局管理器
创建您的布局。我认为官方的Swing教程
通过引入这些对程序员造成伤害
首先是简单的布局管理器。我建议避免它们，
在更强大的经理身上花一些时间。FlowLayout，BorderLayout和Gridlayout真的非常
简单的经理，但他们做不到。
我建议使用以下两个管理器：MigLayoutGroupLayout
（JGoodies的FormLayout也是一个不错的选择。）
这些经理不仅更强大，而且还可以应付
在其他失败的情况下具有更高级的要求。 （解析度
独立性，遵守OS设计原则等）
在介绍两个代码示例之前，我想说一些
指向您的代码。您不必要呼叫repaint()
和revalidate()方法。
setPreferredSize(new Dimension(1000, 500));
以像素为单位指定大小不可移植。你最好依靠
pack()方法。setLayout(new BorderLayout());
JFrame's默认布局管理器（更确切地说是其内容窗格的）是
BorderLayout。因此，不需要此行。以下两个示例是使用
MigLayout和GroupLayout的解决方案。MigLayout解决方案
MigLayout是第三方布局管理器，因此您需要下载和向您的项目添加其他jar。
package com.zetcode;
import java.awt.EventQueue;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTabbedPane;
import javax.swing.JTable;
import net.miginfocom.swing.MigLayout;
public class MigLayoutEx extends JFrame {
private JComboBox cityBox;
private JTable filterTable;
public MigLayoutEx() {
initUI();
}
private void initUI() {
JTabbedPane tabbedPane = new JTabbedPane(JTabbedPane.TOP);
add(tabbedPane);
filterTable = createTable();
cityBox = createCityBox();
JPanel pnl = new JPanel(new MigLayout(""));
pnl.add(new JLabel("City"), "split 2");
pnl.add(cityBox, "wrap");
pnl.add(new JScrollPane(filterTable));
tabbedPane.addTab("Test", pnl);
pack();
setTitle("MigLayout example");
setLocationRelativeTo(null);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
private JTable createTable() {
String[] columnNames = {"Cities"};
String[][] data = {
{"NY"}, {"NY"}, {"NY"}, {"NY"}, {"LA"}, {"LA"}, {"Columbia"},
{"DC"}, {"DC"}, {"DC"}, {"DC"}, {"DC"}, {"DC"}
};
JTable table = new JTable(data, columnNames);
table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
return table;
}
private JComboBox createCityBox() {
String[] fillings = {"NY", "LA", "Columbia", "DC"};
JComboBox box = new JComboBox(fillings);
return box;
}
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
MigLayoutEx ex = new MigLayoutEx();
ex.setVisible(true);
}
});
}
}
GroupLayout解决方案
GroupLayout是内置的布局管理器，无需添加其他jar。package com.zetcode;
import java.awt.EventQueue;
import javax.swing.GroupLayout;
import static javax.swing.GroupLayout.Alignment.BASELINE;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTabbedPane;
import javax.swing.JTable;
public class GroupLayoutEx extends JFrame {
private JComboBox cityBox;
private JTable filterTable;
public GroupLayoutEx() {
initUI();
}
private void initUI() {
JPanel pnl = new JPanel();
GroupLayout gl = new GroupLayout(pnl);
pnl.setLayout(gl);
JTabbedPane tabbedPane = new JTabbedPane(JTabbedPane.TOP);
add(tabbedPane);
JLabel cityLbl = new JLabel("City");
filterTable = createTable();
JScrollPane spane = new JScrollPane(filterTable);
cityBox = createCityBox();
gl.setAutoCreateGaps(true);
gl.setAutoCreateContainerGaps(true);
gl.setHorizontalGroup(gl.createParallelGroup()
.addGroup(gl.createSequentialGroup()
.addComponent(cityLbl)
.addComponent(cityBox))
.addComponent(spane)
);
gl.setVerticalGroup(gl.createSequentialGroup()
.addGroup(gl.createParallelGroup(BASELINE)
.addComponent(cityLbl)
.addComponent(cityBox))
.addComponent(spane)
);
tabbedPane.addTab("Test", pnl);
pack();
setTitle("GroupLayout example");
setLocationRelativeTo(null);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
private JTable createTable() {
String[] columnNames = {"Cities"};
String[][] data = {
{"NY"}, {"NY"}, {"NY"}, {"NY"}, {"LA"}, {"LA"}, {"Columbia"},
{"DC"}, {"DC"}, {"DC"}, {"DC"}, {"DC"}, {"DC"}
};
JTable table = new JTable(data, columnNames);
table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
return table;
}
private JComboBox createCityBox() {
String[] fillings = {"NY", "LA", "Columbia", "DC"};
JComboBox box = new JComboBox(fillings);
return box;
}
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
GroupLayoutEx ex = new GroupLayoutEx();
ex.setVisible(true);
}
});
}
}
我建议同时研究经理和选择您喜欢的人。