更改多维数组中单个阵列 [英] change multidimensional array to single array

问题描述

我想用我的array.but split（）方法，我不能用单array.this是我的code：

i want to use split() method in my array.but, i cant use single array.this is my code:

output_list = [1 2 3 4,5- 6 7 8,9- 8 7 6]

output_list=[1 2 3 4,5 6 7 8,9 8 7 6]

Arraylist<String> output_list = new ArrayList<String>();
    String[][] test = new String[output_list.size()][];
    for(int i=0; i<output_list.size();i++)
    {
       String temp = output_list.get(i);
       test[i] = temp.split(" ");
    }

我想使用唯一的单阵列测试[]。使用.split（）后，我们分割数据output_list的该项目将被插入到测试[]。但问题是，当我改变字符串测试[] []测试[];
我有不兼容的类型error.anyone能告诉我为什么它的发生？用java IM

i want to use only single array test[].and the the item in output_list will be insert into test[] after we split the data using .split(). but the problem is when i change String test[][] to test[]; i got incompatible type error.anyone can tell me why its happened?im using java

推荐答案

我建议使用的临时列表，并在年底转换为一个数组。

I recommend using a temporary list and converting to an array at the end.

    List<String> output_list = new ArrayList<String>();

    //add test values
    output_list.add("1 2 3 4");
    output_list.add("5 6 7 8");
    output_list.add("9 8 7 6");

    //temporary list used until converted to an array at the end
    List<String> temp = new ArrayList<String>();

    //iterate over each string in the output_list
    for(String group : output_list){

        //1. split each group into individual strings
        //2. Convert the array returned from split into a list
        //3. Add that list to the temp list
        temp.addAll(Arrays.asList(group.split(" ")));
    }

    //convert the temp list into a string array
    String[] test = temp.toArray(new String[temp.size()]);

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