Java 从文件插入数组

这是我的密码：

while (scan.hasNext()) 
    {
        if(scan.next().toLowerCase().equals("car") )
        {
            carsdata[count++] = new Car(scan.next(), scan.nextInt(), scan.nextInt(), scan.next(), scan.next() ,scan.nextInt(), scan.nextDouble(), scan.next(), scan.next(), scan.next(), scan.next());
        }
    }

    while (scan2.hasNext()) 
    {
        if(scan2.next().toLowerCase().equals("motorcycle"))
        {
            motorcyclesdata[count++] = new Motorcycle(scan.next(), scan.nextInt(), scan.nextInt(), scan.next(), scan.next() ,scan.nextInt(), scan.nextDouble(), scan.next(), scan.next(), scan.next(), scan.next());
        }
    }
    while (scan3.hasNext()) 
    {
        if(scan3.next().toLowerCase().equals("van"))
        {
            vansdata[count++] = new Van(scan.next(), scan.nextInt(), scan.nextInt(), scan.next(), scan.next() ,scan.nextInt(), scan.nextDouble(), scan.next(), scan.nextInt(), scan.next());
        }
    }
    while (scan4.hasNext()) 
    {
        if(scan4.next().toLowerCase().equals("pickup"))
        {
            pickupsdata[count++] = new Pickup(scan.next(), scan.nextInt(), scan.nextInt(), scan.next(), scan.next() ,scan.nextInt(), scan.nextDouble(), scan.next(), scan.nextInt(), scan.nextInt(), scan.next());
        }
    }

由于某种原因，我失去了摩托车的部分，没有执行。我通过将消息框放入该循环进行检查。不起作用。不过，这辆车的工作原理很好

以下是im用于输出到文本区域的代码：

if (e.getSource() == btnMotorcycles)
        {
            vehicleTextArea.setText("");
            int i =0;

            while (motorcyclesdata[i] != null)
            {

                vehicleTextArea.insert("\t" + motorcyclesdata[i].seatMaterial, 1);
                vehicleTextArea.insert("\t" + motorcyclesdata[i].seatColor, 1);
                vehicleTextArea.insert("\t" + motorcyclesdata[i].mainColor, 1);
                vehicleTextArea.insert("\t" + motorcyclesdata[i].price, 1);
                vehicleTextArea.insert("\t" + motorcyclesdata[i].passengers, 1);
                vehicleTextArea.insert("\t" + motorcyclesdata[i].model, 1);
                vehicleTextArea.insert("\t" + motorcyclesdata[i].brand, 1);
                vehicleTextArea.insert("\t" + motorcyclesdata[i].cc, 1);
                vehicleTextArea.insert("\t" + motorcyclesdata[i].engineCap, 1);
                vehicleTextArea.insert("" + motorcyclesdata[i].licenseNo, 1);
                vehicleTextArea.insert("\n", 1);
                i++;
            }
            vehicleTextArea.insert("Licence No \t Engine\t CC \t Brand \t Model \t Passengers \t Price \t Material \t Paint \t Main Color \t Seat Color \t Seat Material", 0);
        }//end if

---

除了代码的有效性之外，我还忽略了什么

您应该尝试以下方法

while (scan.hasNext()) 
    {
     String scanStr = scan.next();
        if(scanStr.toLowerCase().equals("car") )
        {
            carsdata[count++] = new Car(scan.next(), scan.nextInt(), scan.nextInt(), scan.next(), scan.next() ,scan.nextInt(), scan.nextDouble(), scan.next(), scan.next(), scan.next(), scan.next());
        }

        if(scanStr.toLowerCase().equals("motorcycle"))
        {
            motorcyclesdata[count++] = new Motorcycle(scan.next(), scan.nextInt(), scan.nextInt(), scan.next(), scan.next() ,scan.nextInt(), scan.nextDouble(), scan.next(), scan.next(), scan.next(), scan.next());
        }

        if(scanStr.toLowerCase().equals("van"))
        {
            vansdata[count++] = new Van(scan.next(), scan.nextInt(), scan.nextInt(), scan.next(), scan.next() ,scan.nextInt(), scan.nextDouble(), scan.next(), scan.nextInt(), scan.next());
        }

        if(scanStr.toLowerCase().equals("pickup"))
        {
            pickupsdata[count++] = new Pickup(scan.next(), scan.nextInt(), scan.nextInt(), scan.next(), scan.next() ,scan.nextInt(), scan.nextDouble(), scan.next(), scan.nextInt(), scan.nextInt(), scan.next());
        }
    }

下面还有一个观察：只需检查您是否希望以与实现相同的方式实现它

    while (scan2.hasNext()) //here you are checking for Sacnner Object 2
        {
            if(scan2.next().toLowerCase().equals("motorcycle"))
            {
//here you are using Scanner Object 1 only make sure you intended to implement it to read it from scanner Object 1 only
                motorcyclesdata[count++] = new Motorcycle(scan.next(), scan.nextInt(), scan.nextInt(), scan.next(), scan.next() ,scan.nextInt(), scan.nextDouble(), scan.next(), scan.next(), scan.next(), scan.next()); 
            }
        }

---

汽车和摩托车的代码基本相同（尽管在创建摩托车时可能应该使用

scan2

而不是

scan

）。请阅读：……您是否有4个扫描程序对象读取同一个源，或者甚至有4个单独的源读取属于同一个源的信息？您的while循环没有检查您试图在构造函数中读取的相同扫描程序。@assylias感谢您指出这一点。这仍然没有解决最初的循环没有被进入的问题。@rogue我制作了四个扫描仪，希望下一个可以读入摩托车循环。它不起作用。。有什么想法吗？谢谢你的帮助。：）我现在似乎在摩托车零件上得到了一些输出。但汽车部分也有问题。至少有一些变化。。这是我希望的改进。如果有人感兴趣：为每个子类创建不同的方法解决了问题：）