有没有一种方法可以为ComboBoxes数组编写一个动态actionlistener

Question

我正在开发一个数据库管理系统GUI，它根据直接竞争的团队数量动态创建组合框；如果有两个团队，它会创建两个组合框，三个团队会创建三个框，依此类推。在初始化和放置组合框的forloop内部，我为每个组合框添加了一个ActionListener。在实现ActionListener的嵌套类中，我有一系列if，else-if语句，用于检查Action的源。我是否需要为每个可能的实例创建一个单独的检查，或者有没有一种方法可以使其更动态？基本上，我想用选项列表填充第一个组合框，一旦选择了一个选项，我希望它从后续组合框的选项列表中删除。

else if(e.getSource()==TournamentMatchupCreatebtn)
{
String[] MatchCreationOptions = {"Create Match","Cancel"};
JPanel MatchCreationpnl = new JPanel();
MatchCreationpnl.setLayout(null);
Object[] NumofTeamsARGS = {TournamentRestbl.getValueAt(TournamentRestbl.getSelectedRow(), 0).toString()};
int NumofTeams = Integer.parseInt(dbUpdater.getData(TournamentMatchupHDR,TeamCountqry, NumofTeamsARGS).getValueAt(0, 0).toString());
System.out.println(NumofTeams);
String LabelFlag = dbUpdater.getData(MatchTypeHDR,MatchTypeqry,NumofTeamsARGS).getValueAt(0, 0).toString();
System.out.println(LabelFlag);
String LabelText;
if(LabelFlag.equals("Teams"))
{
LabelText = "Team:";
}
else
{
LabelText = "Player:";
}
ArrayList<String> PlayersList = new ArrayList<String>();
DefaultComboBoxModel dcmb = new DefaultComboBoxModel();
dcmb = dbUpdater.getSpecificValues(MatchTypeqry, NumofTeamsARGS);
for(int i = 0; i<dcmb.getSize();i++)
{
PlayersList.add(dcmb.getElementAt(i).toString());
}
JLabel[] TeamPlayerlbl = new JLabel[NumofTeams];
TeamPlayercmbx = new JComboBox[NumofTeams];
JLabel[] VSlbl = new JLabel[NumofTeams];
for(int i = 0;i<NumofTeams;i++)
{
TeamPlayerlbl[i] = new JLabel(LabelText);
if(i==0)
{
TeamPlayercmbx[i] = new JComboBox(PlayersList.toArray());
}
else
{
TeamPlayercmbx[i]= new JComboBox();
}
VSlbl[i] = new JLabel("VS");
TeamPlayerlbl[i].setSize(TeamPlayerlbl[i].getPreferredSize());
addComponent(MatchCreationpnl,TeamPlayerlbl[i], 5,i*50+5);
addComponent(MatchCreationpnl,TeamPlayercmbx[i],TeamPlayerlbl[i],i*50+5,150,20,5);
VSlbl[i].setSize(VSlbl[i].getPreferredSize());
if(i<NumofTeams-1)
{
addComponent(MatchCreationpnl,VSlbl[i],100,i*50+30);
}
TeamPlayercmbx[i].setEditable(false);
TeamPlayercmbx[i].addActionListener(action);
}
TeamPlayercmbx[0].setEditable(true);
TeamPlayercmbx[0].setModel(MatchTypes);
MatchCreationpnl.setPreferredSize(new Dimension(200,NumofTeams*50+5));
int x = JOptionPane.showOptionDialog(null,MatchCreationpnl,"Create Tournament Match", JOptionPane.OK_CANCEL_OPTION, JOptionPane.PLAIN_MESSAGE,null,MatchCreationOptions,null);
}

这段代码创建了创建匹配的界面，我知道我不应该为这些东西设置像素特定的位置，在我制作的下一个版本中，我将努力使界面更灵活，以适应它显示的屏幕。

else if(e.getSource()==TeamPlayercmbx[0])
{
ArrayList <String> Competitors = new ArrayList();
for(int i=0;i<TeamPlayercmbx[0].getItemCount();i++)
{
Competitors.add(TeamPlayercmbx[0].getItemAt(i).toString());
}
DefaultComboBoxModel DCMB = new DefaultComboBoxModel(Competitors.toArray());
TeamPlayercmbx[1].setEditable(true);
TeamPlayercmbx[1].setModel(DCMB);
TeamPlayercmbx[1].removeItem(TeamPlayercmbx[0].getSelectedItem());
}

该代码从模型中删除所选项目，并允许您为第二个组合框选择一个值。我需要知道的是，是否有办法取代

else if(e.getSource()==TeamPlayercmbx[0]

类似的东西

else if(e.getSource()==TeamPlayercmbx[some variable]

或者如果我需要硬编码出

Answer 1

所以我自己使用一个简单的for循环解决了这个问题：

for(int x =0;x<TeamPlayercmbx.length;x++)
{
if(e.getSource()==TeamPlayercmbx[x])
{
try
{
ArrayList <String> Competitors = new ArrayList();
for(int i=0;i<TeamPlayercmbx[x].getItemCount();i++)
{               
Competitors.add(TeamPlayercmbx[x].getItemAt(i).toString());
}
DefaultComboBoxModel DCMB = new 
DefaultComboBoxModel(Competitors.toArray());
TeamPlayercmbx[x+1].setEditable(true);
TeamPlayercmbx[x+1].setModel(DCMB);
TeamPlayercmbx[x+1].removeItem(TeamPlayercmbx[x].getSelectedItem());
}
catch(Exception ex)
{
}
}
}

事后看来这很明显。希望这个答案能帮助其他人。