Question

嘿，我在这里有点新意，所以如果我在帖子中搞砸了什么，我很抱歉。无论如何我必须处理数组的问题，我正在尝试做的基本上是使用 String [] 数组来填充我的表单并将其显示在屏幕上然后拥有 getForm（）函数返回 String [] ，其中包含表单标题和 text [i] 中的信息。这一切都正常，直到我使用我添加的按钮来调用 getForm（）函数，我更改为另一种形式（ createForm（）附加到ListListener）和所有标签显示为 getForm（）函数中返回的内容。我很确定它与我使用我的阵列的方式有关但我认为在我选择了另一个列表项目之后它会恢复正常，这些列表项目通过 createForm（）函数再次重置阵列，所以我不知道发生了什么。

由于

我已经包含了我所指的内容的截图。

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("");
    }
}

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;
}

查看第（1）行：修改指向标签文本的formReturn数组。 formReturn - ＆gt; formArray - ＆gt; COM。

要修复它，只需在（0）处创建新的String数组：

formReturn = new String[formArray.length];

Java数组被覆盖

1 个答案: