Java数组被覆盖

Question

嗨，我是一个新手，如果我的帖子中有什么问题，请多包涵。无论如何，我遇到的问题与数组有关，基本上我想做的是使用String[]数组填充表格并在屏幕上显示它，然后使 getForm()函数返回一个 String[] ，其中包括表单标题和 text [i] 中的信息。所有这些都很好地运行，直到我使用添加到调用 getForm()函数的按钮并更改为不同的表单（附加到ListListener的 createForm() ）时，所有标签都显示为以前在 getForm()函数中返回的内容。我相当确定它与我使用数组的方式有关，但我认为选择另一个列表项后，它们将重新设置为正常状态，这将再次通过 createForm()函数重置数组，所以我不确定出了什么问题。

谢谢

我还附上了下面的截图。

http://www.majhost.com/gallery/adc90/afsd/error.png

class Form extends JPanel
{
    //Arrays for the forms
    private String[] com = {"Communication","ICAO","Type","Frequency"};
    private String[] fuel = {"Fuel","ICAO","Type"};
    private String[] runway = {"Runway","ICAO","Number","Type","Length"};
    private String[] airplane = {"Airplane","Make","Model","Type","Fuel Capacity", "Fuel Burn Rate", "Air Speed"};
    private String[] airport = {"Airplane","ICAO","Name","Longitude","Latitude","crFreq","crType", "Fuel Type"};

    //Declare variables
    private JTextField[] text;
    private String[] formReturn;
    private String[] formArray;
    private JButton submit,clear;

    public Form()
    {
        createForm("Airplane");
    }

    public void createForm(String choice)
    {
        removeAll();
        if(choice.equals("Communication"))
        {
            formArray = com;
        }
        else if(choice.equals("Fuel"))
        {
            formArray = fuel;
        }
        else if(choice.equals("Airplane"))
        {
            formArray = airplane;
        }
        else if(choice.equals("Airport"))
        {
            formArray = airport;
        }
        else if(choice.equals("Runway"))
        {
            formArray = runway;
        }


        int l = formArray.length + 1;
        text = new JTextField[l];

        //Layout info
        GridLayout grid = new GridLayout(l,2);
        grid.setHgap(0);
        setLayout(grid);
        //Set label
        add(new JLabel(formArray[0]));
        add(new JLabel(""));
        for(int i = 1; i < formArray.length; ++i)
        {
            add(new JLabel(formArray[i]));
            add(text[i] = new JTextField(20));
        }

        //Add in the buttons and the actionlisteners
        submit = new JButton("Create");
        clear = new JButton("Delete");
        add(clear);
            clear.addActionListener(new Button());
        add(submit);
            submit.addActionListener(new Button());
        updateUI();
    }
    //Get form info
    //This works so far
    public String[] getForm()
    {
        formReturn = formArray;
        formReturn[0] = formArray[0];
        for(int i = 1; i < formReturn.length; i++)
            formReturn[i] = text[i].getText();
        return formReturn;
    }
    //Clear form
    public void clearForm()
    {
        for(int i = 1; i < formArray.length; i++)
            text[i].setText("");
    }
}

- adc90

Answer 1

public String[] getForm()
{
    formReturn = formArray; /* (0) */
    formReturn[0] = formArray[0];
    for(int i = 1; i < formReturn.length; i++)
        formReturn[i] = text[i].getText(); /* (1) */
    return formReturn;
}

请看第一行：您修改了指向标签文本的formReturn数组。formReturn -> formArray -> com。

要修复它，只需在（0）处创建新的字符串数组：

formReturn = new String[formArray.length];

- KrHubert

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现在它运行得非常好，我不知道以前为什么没发现。非常感谢！ - adc90