我已经将Java连接到已经工作的数据库，现在我尝试从数据库中获取数据，将其保存在arrayliste中并在Jlist中可视化。 通过尝试这样做我得到和outofBoundsexception。 我是这个领域的初学者，所以如果你有问题，请问。
我的代码在这里
public ArrayList<Data> getAllSports() throws SQLException {
ArrayList<Data> result = new ArrayList<Data>();
String query = "select * from public.sport_type";
Connection connection = connect();
Statement stmt = null;
stmt = connection.createStatement();
ResultSet rs = stmt.executeQuery(query);
while (rs.next()) {
Data sports = new Data(0, query, 0, 0, query, 0, query, query, 0,
0, 0);
sports.setSportID(rs.getInt("sport_type_id"));
model.add(rs.getInt("sport_type_id"), sports);
query = "select * from public.match";
stmt = connection.createStatement();
rs = stmt.executeQuery(query);
while (rs.next()) {
sports.setMatchid(rs.getInt("match_id"));
sports.setMatchn(rs.getString("match_description"));
model.add(rs.getInt("match_id"), rs.getString("match_description"));
query = "select * from public.player";
stmt = connection.createStatement();
rs = stmt.executeQuery(query);
while (rs.next()) {
sports.setPlayerID(rs.getInt("player_id"));
sports.setName(rs.getString("player_name"));
sports.setSpeed(rs.getDouble("sprint_speed"));
query = "select * from public.measurement";
stmt = connection.createStatement();
rs = stmt.executeQuery(query);
while (rs.next()) {
sports.setX(rs.getInt("new_x"));
sports.setY(rs.getInt("y_zero_up"));
sports.setTime(rs.getString("measurement_time"));
result.add(sports);
System.out.println("run");
}
}
}
}
Layout.jList1.setModel(model);
connection.close();
return result;
}
}
这是我的错误信息：
Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: 6 > 0
at java.util.Vector.insertElementAt(Unknown Source)
at javax.swing.DefaultListModel.add(Unknown Source)
at Database.Database_Connection.getAllSports(Database_Connection.java:85)
at visual.Layout.ProcessButton1ActionPerformed(Layout.java:910)
at visual.Layout.access$15(Layout.java:905)
at visual.Layout$16.actionPerformed(Layout.java:284)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$500(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
答案 0 :(得分：0)
所以有两件事关系到我......
ResultSet的新实例，但是将其分配给同一个变量，然后尝试继续使用它，就好像它没有改变一样。每个子查询必须拥有它自己的ResultSet。model.add(rs.getInt("sport_type_id"), sports);可能正在尝试将Object添加到DefaultListModel中不存在的位置。您无法向Vector或ArrayList添加值（通常会将DefaultListModel按顺序支持，这不是这些数据结构的工作方式。您还应该尽一切努力关闭您创建的所有资源，例如......
public ArrayList<Data> getAllSports() throws SQLException {
ArrayList<Data> result = new ArrayList<Data>();
String query = "select * from public.sport_type";
try (Connection connection = connect()) {
Statement stmt = connection.createStatement();
try (ResultSet rs = stmt.executeQuery(query)) {
while (rs.next()) {
Data sports = new Data(0, query, 0, 0, query, 0, query, query, 0,
0, 0);
sports.setSportID(rs.getInt("sport_type_id"));
model.add(rs.getInt("sport_type_id"), sports);
query = "select * from public.match";
stmt = connection.createStatement();
try (ResultSet rs1 = stmt.executeQuery(query)) {
while (rs1.next()) {
sports.setMatchid(rs1.getInt("match_id"));
sports.setMatchn(rs1.getString("match_description"));
model.add(rs1.getInt("match_id"), rs1.getString("match_description"));
query = "select * from public.player";
stmt = connection.createStatement();
try (ResultSet rs2 = stmt.executeQuery(query)) {
while (rs2.next()) {
sports.setPlayerID(rs2.getInt("player_id"));
sports.setName(rs2.getString("player_name"));
sports.setSpeed(rs2.getDouble("sprint_speed"));
query = "select * from public.measurement";
stmt = connection.createStatement();
try (ResultSet rs3 = stmt.executeQuery(query)) {
while (rs3.next()) {
sports.setX(rs3.getInt("new_x"));
sports.setY(rs3.getInt("y_zero_up"));
sports.setTime(rs3.getString("measurement_time"));
result.add(sports);
System.out.println("run");
}
}
}
}
}
}
}
}
}
Layout.jList1.setModel(model);
return result;
}