Question

在将元素插入二维数组时获取ArrayIndexOutOfBoundException ..我不知道问题出在哪里.. 我尝试了很多，但无法理解为什么这会给出异常。这是我的代码..提前谢谢..

public class TruthTableAutoMateClass extends JPanel implements ActionListener
{

static int size;

private int i = 0;

static JButton btnOk = new JButton();

String[][] array= new String[size][];

private double[][] dim = { {0.50, 0.50}, {0.25, 0.20, 0.20, 0.20, TableLayout.FILL}};


public static void main(String args[])
{
    TruthTableAutoMateClass auto = new TruthTableAutoMateClass();
    checkAdding(auto);
    btnOk.addActionListener(auto);
}

private static String[] prepareArray()
{
    String[] arr = new String[2];

    if (size == 16)
    {

        String text1 = field1.getText();
        String text2 = field2.getText();
        String text3 = field3.getText();
        String text4 = field4.getText();

        String firstArray = new StringBuilder().append(text1).append("|").append(text3).append("|").append(text3).append("|").append(text4).toString();

        arr[0] = firstArray;
        arr[1] = ledValue1.getText();

    }
    else if (size == 9)
    {

    }
    else if (size == 4)
    {

    }

    return arr;
}

private static void checkAdding(TruthTableAutoMateClass auto1)
{
    TruthTableAutoMateClass auto = auto1;
    String answer = JOptionPane.showInputDialog("How many values are there 4 or 3 " + "if 4 yes else press no");

    if (answer.equalsIgnoreCase("yes"))
    {

        size = 4 * 4;
        auto.add(lbl1, "0,0");
        auto.add(lbl2, "0,1");
        auto.add(lbl3, "0,2");
        auto.add(lbl4, "0,3");

        auto.add(field1, "1,0");
        auto.add(field2, "1,1");
        auto.add(field3, "1,2");
        auto.add(field4, "1,3");

        auto.add(ledValue1, "1,4");
        /*auto.add(ledValue2);
        auto.add(ledValue3);
        auto.add(ledValue4);*/

        auto.add(btnOk, "0,4");

    }
    else
    {
        size = 3 * 3;
        String answer2 = JOptionPane.showInputDialog("Again enter yes or no" + "3 for yes , 2 for no");
        if (answer2.equalsIgnoreCase("yes"))
        {
            auto.add(lbl1, "0,0");
            auto.add(lbl2, "0,1");
            auto.add(lbl3, "0,2");
            auto.add(field1, "1,0");
            auto.add(field2, "1,1");
            auto.add(field3, "1,2");

            auto.add(ledValue1, "1,4");
            /* auto.add(ledValue2);
             auto.add(ledValue3);*/

            auto.add(btnOk, "0,4");
        }
        else
        {
            size = 2 * 2;
            auto.add(lbl1, "0,0");
            auto.add(lbl2, "0,1");

            auto.add(field1, "1,0");
            auto.add(field2, "1,1");

            auto.add(ledValue1, "1,4");
            /* auto.add(ledValue2);*/
            auto.add(btnOk, "0,4");
        }
    }
}

@Override
public void actionPerformed(ActionEvent e)
{

    array[i] = prepareArray();

    i++;

    System.out.println(Arrays.toString(array));
}}

Answer 1

在main()方法中，您正在创建TruthTableAutoMateClass的实例。当这个创建时，size = 0（默认情况下）和String[][] array= new String[size][];创建一个大小为0的数组。

因此，您的数组的大小为0，当您尝试分配像array[i] = prepareArray();这样的值时，您会遇到异常。

插入元素时出现ArrayOutOfBoundException

1 个答案: