Question

我有这个多维数组：

String[][] qArray = new String[][] {
  {"question", "answerOption1", "answerOption2", "answerOption3", "answerOption4"}
  {"question", "answerOption1", "answerOption2", "answerOption3", "answerOption4"}
}

我将问题文本分配给TextView，将andswerOptions分配给Buttons上的文本。订单是随机选择的，因为问题不应该被问两次，我需要删除刚问的问题。我读过的我需要删除这个数组并创建一个新数组，但我不太确定这是怎么做的。我不确定for语法是如何在Java中进行的，但这是我的猜测：

假设问题是在TextView tv中进行的

String[][] newArray = new String[qArray.length-1][5] {
For rows in qArray do newArray.addRow
  if (qArray[0..qArray.length][0] != tv.getText());
qArray = newArray

然后再次重做这些方法，直到没有其他问题。

Answer 1

队列就是为了这个目的。

public static void main(String[] args)
    {
        String[][] qArray = new String[][]
        {
            {"question", "answerOption1", "answerOption2", "answerOption3", "answerOption4"},
            {"question5", "answerOption6", "answerOption7", "answerOption8", "answerOption9"}
        };

        Queue<String[]> list = new LinkedList<String[]>(Arrays.asList(qArray));
        for (String[] theArr = list.poll() ; theArr!=null ; theArr = list.poll())
        {
            for (String theStr : theArr)
            {
                System.out.print(theStr + " ");
            }
            System.out.print("\n");
        }
    }

Answer 2

如果您只是在寻找for循环实现。为什么不使用这样的东西

String[][] newArray = new String[qArray.length][5];
for(int i=0; i<=qArray.length-1; i++){
 for(int j=0; j<5; j++){
    newArray[i][j] = qArray[i][j];
 }
}

Answer 3

public static void main(String[] args){
        String[][] qArray = new String[][]{
                {"question", "answerOption1", "answerOption2", "answerOption3", "answerOption4"},
                {"question5", "answerOption6", "answerOption7", "answerOption8", "answerOption9"}
            };

            List<String[]> list = new ArrayList<String[]>(Arrays.asList(qArray));
            list.remove(1);//row that needs to be deteted
            String[][] qArray1 = list.toArray(new String[][]{});
            for (String[] arr : qArray1) {
                System.out.println(Arrays.toString(arr));
            }

    }

从多维数组中删除行

3 个答案: