如何使按钮按升序排序我的列表(Java swing)？
如何使按钮按升序排序我的列表(Java swing)？
提问于 2020-12-01 14:12:02
我在java swing中创建了一个jtable，如下所示
我增加了6个按钮，其中3个可以正常工作(添加、更新、删除)。我不担心随机匹配按钮，但我希望“按目标排序”按钮，以整理所有记录输入的最高数目的目标。积分也是如此。我试过很多次了，但我似乎找不出答案。
下面是我的表数组的代码；
// create JFrame and JTable
JFrame frame = new JFrame();
JTable table = new JTable();
Container c = frame.getContentPane();
c.setLayout(new BoxLayout(c, BoxLayout.Y_AXIS));
c.add(table);
// create a table model and set a Column Identifiers to this model
Object[] columns = {"Team name", "Wins", "Losses", "Goals Difference","Points","Matches played"};
DefaultTableModel model = new DefaultTableModel();
model.setColumnIdentifiers(columns);
// set the model to the table
table.setModel(model);
// Change A JTable Background Color, Font Size, Font Color, Row Height
table.setBackground(Color.LIGHT_GRAY);
table.setForeground(Color.black);
Font font = new Font("", 1, 22);
table.setFont(font);
table.setRowHeight(30);
// table.setVisible(true);这是我的按钮草稿；
btnSortPoints.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
}
});这是我的删除按钮；
btnDelete.addActionListener(new ActionListener(){
@Override
public void actionPerformed(ActionEvent e) {
// i = the index of the selected row
int i = table.getSelectedRow();
if(i >= 0){
// remove a row from jtable
model.removeRow(i);
}
else{
System.out.println("Delete Error");
}
}
});这是我的全部代码；
public class table{
public static void main(String[] args) {
// create JFrame and JTable
JFrame frame = new JFrame();
JTable table = new JTable();
Container c = frame.getContentPane();
c.setLayout(new BoxLayout(c, BoxLayout.Y_AXIS));
c.add(table);
// create a table model and set a Column Identifiers to this model
Object[] columns = {"Team name", "Wins", "Losses", "Goals Difference","Points","Matches played"};
DefaultTableModel model = new DefaultTableModel();
model.setColumnIdentifiers(columns);
// set the model to the table
table.setModel(model);
// Change A JTable Background Color, Font Size, Font Color, Row Height
table.setBackground(Color.LIGHT_GRAY);
table.setForeground(Color.black);
Font font = new Font("", 1, 22);
table.setFont(font);
table.setRowHeight(30);
// table.setVisible(true);
// create JTextFields
JTextField txtTeamName = new JTextField();
JTextField txtWins = new JTextField();
JTextField txtLosses = new JTextField();
JTextField txtGD = new JTextField();
JTextField txtPoints = new JTextField();
JTextField txtMatches = new JTextField();
JLabel lblTeamName = new JLabel("Team name");
JLabel lblWins = new JLabel("Wins");
JLabel lblLosses = new JLabel("Losses");
JLabel lblGD = new JLabel("Goal difference");
JLabel lblPoints = new JLabel("Points");
JLabel lblMatches = new JLabel("Matches");
// create JButtons
JButton btnAdd = new JButton("Add");
JButton btnDelete = new JButton("Delete");
JButton btnUpdate = new JButton("Update");
JButton btnSortPoints = new JButton("Sort by points");
JButton btnSortGoals = new JButton("Sort by goals");
JButton btnRandomMatch = new JButton("Add a random data");
txtTeamName.setBounds(1200, 230, 100, 25);
txtWins.setBounds(1200, 260, 100, 25);
txtLosses.setBounds(1200, 290, 100, 25);
txtGD.setBounds(1200, 320, 100, 25);
txtMatches.setBounds(1200,350,100,25);
txtPoints.setBounds(1200,380,100,25);
lblTeamName.setBounds(1100,230,100,25);
lblWins.setBounds(1100,260,100,25);
lblLosses.setBounds(1100,290,100,25);
lblGD.setBounds(1100,320,100,25);
lblMatches.setBounds(1100,350,100,25);
lblPoints.setBounds(1100,380,100,25);
btnAdd.setBounds(1150, 20, 200, 50);
btnUpdate.setBounds(1150, 80, 200, 50);
btnDelete.setBounds(1150, 140, 200, 50);
btnSortGoals.setBounds(920,20,200,50);
btnSortPoints.setBounds(920,80,200,50);
btnRandomMatch.setBounds(920,140,200,50);
// create JScrollPane
JScrollPane pane = new JScrollPane(table);
pane.setBounds(0, 0, 880, 400);
frame.setLayout(null);
frame.add(pane);
// add JTextFields to the jframe
frame.add(txtTeamName);
frame.add(txtWins);
frame.add(txtLosses);
frame.add(txtGD);
frame.add(txtMatches);
frame.add(txtPoints);
//Adding the labels to the frame
frame.add(lblTeamName);
frame.add(lblWins);
frame.add(lblLosses);
frame.add(lblGD);
frame.add(lblMatches);
frame.add(lblPoints);
// add JButtons to the jframe
frame.add(btnAdd);
frame.add(btnDelete);
frame.add(btnUpdate);
frame.add(btnSortGoals);
frame.add(btnSortPoints);
frame.add(btnRandomMatch);
// create an array of objects to set the row data
Object[] row = new Object[6];
// button add row
btnAdd.addActionListener(new ActionListener(){
@Override
public void actionPerformed(ActionEvent e) {
row[0] = txtTeamName.getText();
row[1] = txtWins.getText();
row[2] = txtLosses.getText();
row[3] = txtGD.getText();
row[4] = txtMatches.getText();
row[5] = txtPoints.getText();
// add row to the model
model.addRow(row);
}
});
// Event listener for button remove row
btnDelete.addActionListener(new ActionListener(){
@Override
public void actionPerformed(ActionEvent e) {
// i = the index of the selected row
int i = table.getSelectedRow();
if(i >= 0){
// remove a row from jtable
model.removeRow(i);
}
else{
System.out.println("Delete Error");
}
}
});
// get selected row data From table to textfields
table.addMouseListener(new MouseAdapter(){
@Override
public void mouseClicked(MouseEvent e){
// i = the index of the selected row
int i = table.getSelectedRow();
txtTeamName.setText(model.getValueAt(i, 0).toString());
txtWins.setText(model.getValueAt(i, 1).toString());
txtLosses.setText(model.getValueAt(i, 2).toString());
txtGD.setText(model.getValueAt(i, 3).toString());
txtMatches.setText(model.getValueAt(i,4).toString());
txtPoints.setText(model.getValueAt(i,5).toString());
}
});
// button update row
btnUpdate.addActionListener(new ActionListener(){
@Override
public void actionPerformed (ActionEvent e) {
// i = the index of the selected row
int i = table.getSelectedRow();
if(i >= 0)
{
model.setValueAt(txtTeamName.getText(), i, 0);
model.setValueAt(txtWins.getText(), i, 1);
model.setValueAt(txtLosses.getText(), i, 2);
model.setValueAt(txtGD.getText(), i, 3);
model.setValueAt(txtMatches.getText(),i,4);
model.setValueAt(txtPoints.getText(),i,5);
}
else{
System.out.println("Update Error");
}
}
});
btnSortPoints.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
}
});
frame.setSize(1400, 500);
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}回答 1
Stack Overflow用户
回答已采纳
发布于 2020-12-01 15:38:59
- 您首先需要向JTable添加排序支持。阅读教程中的
Sorting and Filtering链接，了解如何做到这一点。
- 完成后，用户将能够通过单击列的列标题对任何列进行排序。
通过手动单击列标题来验证排序是否有效。
我想要“按目标排序”按钮来整理按最高目标和点数输入的所有记录
既然您的JTable支持排序，就可以向按钮中添加一个ActionListener以执行特定的排序：
btnSortPoints.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// Points column in the model is converted to the view column
int viewColumn = table.convertColumnIndexToView(4);
// Set up the columns you want to sort on
List<RowSorter.SortKey> sortKeys = new ArrayList<>();
sortKeys.add(new RowSorter.SortKey(viewColumn, SortOrder.ASCENDING));
// Do the sorting
TableRowSorter sorter = (TableRowSorter)table.getRowSorter();
sorter.setSortKeys(sortKeys);
}
});`
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/65092141
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