我试着做一个程序,你可以启动一个摆动框架按钮,并从中选择一个按钮做各种事情。其中之一就是显示一个表,其中包含 ArrayList
. 当按下按钮时,表格会打开,但即使我将内容添加到数组列表中,内容也是空的。如果我以switch语句中注解掉的方式调用表,在case“g”下,我从数组列表中得到数据,表就工作了。
我不知道是什么原因导致的问题,我不能得到按钮打开表和显示信息。
public static void main(String[] args) {
/* Display user menu, select from menu */
String menuSelector;
Scanner selectfromMenu = new Scanner(System.in);
PremierLeagueManager PLM = new PremierLeagueManager();
PLM.menu();
/* dowhile to allow multiple functionality through menu */
do {
menuSelector = PLM.userInput.nextLine().toUpperCase();
switch(menuSelector){
case "A":
PLM.addClub();
break;
case "V":
PLM.displayClubs(PLM.clubs);
break;
case "D":
PLM.deleteClub(PLM.clubs);
break;
case "S":
PLM.addMatchStatistic(PLM.clubs);
break;
case "F":
PLM.displayStatistics(PLM.clubs);
break;
case "G":
GUInterface GUI = new GUInterface();
//PLM.displayTable(PLM.clubs);
break;
case "Q":
System.exit(0);
break;
default:
break;
}
} while(menuSelector != "q");
}
public class GUInterface {
JFrame frame;
JPanel jPanel = new JPanel();
Container c;
GUInterface()
{
frame = new JFrame("PremierLeageGUI");
JButton leagueTable = new JButton("Premier League Table");
JButton sortGoals = new JButton("Sort by goals scored, descending order");
JButton sortWins = new JButton("Sort by wins scored, descending order");
c = frame.getContentPane();
frame.setLayout(new FlowLayout());
c.add(leagueTable);
c.add(sortGoals);
c.add(sortWins);
leagueTable.addActionListener(new ActionEvents(frame, leagueTable));
frame.setSize(400,400);
frame.setVisible(true);
frame.getContentPane().setBackground(Color.pink);
frame.addWindowListener(new WindowListener());
}
}
public class ActionEvents implements ActionListener {
JFrame frame;
JButton showtable;
PremierLeagueManager p = new PremierLeagueManager();
ActionEvents(JFrame f, JButton b)
{
frame = f;
showtable = b;
}
@Override
public void actionPerformed(ActionEvent e) {
if(e.getSource() == showtable)
{
p.displayTable(p.clubs);
}
}
}
//displayTable method inside PremierLeagueManager class
protected ArrayList<FootballClub> clubs = new ArrayList<FootballClub>();
public void displayTable(ArrayList<FootballClub> footballClubs)
{
String[] columnNames = {"Club name", "goals", "points", "wins"};
DefaultTableModel model = new DefaultTableModel(columnNames, 0);
for(int i = 0; i < footballClubs.size(); i++)
{
String name = footballClubs.get(i).getClubName();
int goals = footballClubs.get(i).getGoals();
int points = footballClubs.get(i).getPoints();
int wins = footballClubs.get(i).getWins();
Object[] row = {name, goals, points, wins};
model.addRow(row);
System.out.println(name);
}
final JTable teamTable = new JTable(model);
teamTable.setFillsViewportHeight(true);
JPanel panel = new JPanel();
JScrollPane scrollPane = new JScrollPane(teamTable);
panel.add(scrollPane);
JFrame frame = new JFrame("Tableview");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
teamTable.setOpaque(true);
frame.setContentPane(panel);
frame.pack();
frame.setSize(500, 500);
frame.setVisible(true);
}
1条答案
按热度按时间xghobddn1#
你应该通过现有的
PremierLeagueManager
进入GUInterface
建造师。在主要方法中:
这个
GUInterface
构造函数必须接受PremierLeagueManager
作为参数。在guinterface课程中:actionevent类的开始如下所示: