提示数组越界，根本不知道哪错了

Question

问题遇到的现象和发生背景

问题相关代码，请勿粘贴截图

        try{  
            String url,userName,userPwd;  
            url="jdbc:sqlserver://localhost:1433;DatabaseName=Student";  
            userName="sa";  
            userPwd="123456";  
            con=DriverManager.getConnection(url,userName,userPwd);  
            int 字段个数=getZiDuan();  
            int n=getAmount();  
            a=new Object[n][字段个数];  
            sql=con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_READ_ONLY);  
            rs=sql.executeQuery("select * from "+tableName);  
            int m=0;  
            while(rs.next()){  
                for(int k=1;k<=字段个数;k++){  
                    a[m][k-1]=rs.getString(k-1);  
                }  
                System.out.println();  
                m++;  
            }  
            con.close();  
        }  
        catch(SQLException e){  
            System.out.println("请输入正确的表名"+e);  
        }  
        return a;  
    } 

运行结果及报错内容

Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: 0
at StudentManagementSystem.Query.getRecord(Query.java:38)
at StudentManagementSystem.Scan_stu.(Scan_stu.java:24)
at StudentManagementSystem.CommFrame.(CommFrame.java:74)
at StudentManagementSystem.loginFrame.actionPerformed(LLogin.java:85)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348)
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:6533)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)
at java.awt.Component.processEvent(Component.java:6298)
at java.awt.Container.processEvent(Container.java:2236)
at java.awt.Component.dispatchEventImpl(Component.java:4889)
at java.awt.Container.dispatchEventImpl(Container.java:2294)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4888)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4525)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4466)
at java.awt.Container.dispatchEventImpl(Container.java:2280)
at java.awt.Window.dispatchEventImpl(Window.java:2746)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
at java.awt.EventQueue$4.run(EventQueue.java:731)
at java.awt.EventQueue$4.run(EventQueue.java:729)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
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)

我的解答思路和尝试过的方法

我想要达到的结果

Answer 1

rs.getString(n)用法说明：
rs：为结果集；
rs.getString(n) ：为获取结果集当前行的第n列数据。

        try{  
            String url,userName,userPwd;  
            url="jdbc:sqlserver://localhost:1433;DatabaseName=Student";  
            userName="sa";  
            userPwd="123456";  
            con=DriverManager.getConnection(url,userName,userPwd);  
            int 字段个数=getZiDuan();  
            int n=getAmount();  
            a=new Object[n][字段个数];  
            sql=con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_READ_ONLY);  
            rs=sql.executeQuery("select * from "+tableName);  
            int m=0;  
            while(rs.next()){  
                for(int k=1;k<=字段个数;k++){  
                    a[m][k-1]=rs.getString(k);  
                }  
                System.out.println();  
                m++;  
            }  
            con.close();  
        }  
        catch(SQLException e){  
            System.out.println("请输入正确的表名"+e);  
        }  
        return a;  
    }