Question

所以我创建了两个相同的方法，并返回主席ID和预订日期：

public ArrayList<String> GetChair(String Class) throws SQLException{
      ArrayList<String> arr = new ArrayList<String>(20);
      openconnection();
      String querychair = "SELECT * FROM hema.flight_usa WHERE free = 1 and class='"+Class+"'";
      Statement stm=(Statement) con.createStatement();

    ResultSet rs;
   rs = stm.executeQuery(querychair);

   while(rs.next())
   {
      arr.add(rs.getString("chair_id"));



   }
   return arr;
  }

  //---------------- The Second One ----------------------------------------

  public ArrayList<String> GetDate(String Class) throws SQLException{

     ArrayList<String> arr2 = new ArrayList<String>(20);

      openconnection();
      String querydate = "SELECT * FROM hema.flight_usa WHERE free = 1 and class='"+Class+"'";
      Statement stm=(Statement) con.createStatement();

    ResultSet rst;
   rst = stm.executeQuery(querydate); 

      while(rst.next())
   {
      arr2.add(rst.getString("res_date"));



   }
   return arr2;

  }

然后我调用这两个方法从表中获取数据问题是我只得到第一个被调用的方法：

 private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         

    try {
        String Class=Class1Text.getText();
        Model model =new Model();


        ArrayList<String> arr1=new ArrayList<String>(20);

        arr1=model.GetDate(Class);


        jTextField12.setText(arr1.get(0));
        jTextField13.setText(arr1.get(1));
        jTextField14.setText(arr1.get(2));
        jTextField15.setText(arr1.get(3));
        jTextField16.setText(arr1.get(4));
        jTextField17.setText(arr1.get(5));
        jTextField18.setText(arr1.get(6));
        jTextField19.setText(arr1.get(7));
        jTextField20.setText(arr1.get(8));
        jTextField21.setText(arr1.get(9));


        ArrayList<String> arr=new ArrayList<String>(20);
           arr =     model.GetChair(Class);

        jTextField2.setText(arr.get(0));
        jTextField3.setText(arr.get(1));
        jTextField4.setText(arr.get(2));
        jTextField5.setText(arr.get(3));
        jTextField6.setText(arr.get(4));
        jTextField7.setText(arr.get(5));
        jTextField8.setText(arr.get(6));
        jTextField9.setText(arr.get(7));
        jTextField10.setText(arr.get(8));
        jTextField11.setText(arr.get(9));



    } catch (SQLException ex) {
        Logger.getLogger(Reservation.class.getName()).log(Level.SEVERE, null, ex);
    }



}

这样就可以完成GetDate方法了

和他一起给我这个错误：

Exception in thread "AWT-EventQueue-0" java.lang.IndexOutOfBoundsException: Index: 3, Size: 3 at java.util.ArrayList.rangeCheck(ArrayList.java:638) at java.util.ArrayList.get(ArrayList.java:414) at View.Reservation.jButton1ActionPerformed(Reservation.java:293) at View.Reservation.access$000(Reservation.java:16) at View.Reservation$1.actionPerformed(Reservation.java:84) at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022) at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2346) at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402) at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259) at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252) at java.awt.Component.processMouseEvent(Component.java:6527) at javax.swing.JComponent.processMouseEvent(JComponent.java:3321) at java.awt.Component.processEvent(Component.java:6292) at java.awt.Container.processEvent(Container.java:2234) at java.awt.Component.dispatchEventImpl(Component.java:4883) at java.awt.Container.dispatchEventImpl(Container.java:2292) at java.awt.Component.dispatchEvent(Component.java:4705) at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4898) at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4533) at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4462) at java.awt.Container.dispatchEventImpl(Container.java:2278) at java.awt.Window.dispatchEventImpl(Window.java:2739) at java.awt.Component.dispatchEvent(Component.java:4705) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:746) at java.awt.EventQueue.access$400(EventQueue.java:97) at java.awt.EventQueue$3.run(EventQueue.java:697) at java.awt.EventQueue$3.run(EventQueue.java:691) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75) at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:86) at java.awt.EventQueue$4.run(EventQueue.java:719) at java.awt.EventQueue$4.run(EventQueue.java:717) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75) at java.awt.EventQueue.dispatchEvent(EventQueue.java:716) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93) at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

Answer 1

抛出IndexOutOfBoundsException以指示索引超出范围。在第二个结果集中，您调用了10个结果，结果可能只有3行。

Answer 2

在获取详细信息之前检查列表的大小，

if(arr1.size()>9){
        jTextField12.setText(arr1.get(0));
        jTextField13.setText(arr1.get(1));
        jTextField14.setText(arr1.get(2));
        jTextField15.setText(arr1.get(3));
        jTextField16.setText(arr1.get(4));
        jTextField17.setText(arr1.get(5));
        jTextField18.setText(arr1.get(6));
        jTextField19.setText(arr1.get(7));
        jTextField20.setText(arr1.get(8));
        jTextField21.setText(arr1.get(9));
}

只是第一个ArrayList <string>工作</string>

2 个答案: