Method of converting java String to Double two dimensional array

WHY

A friend asks a question in a group. The prototype of the question is as follows:

String str = "{{10.14, 11.24, 44.55, 41.01},{12.10, 14.21, 52.14, 50.44},{14.44, 16.12, 45.42, 47.55}}";
 into double[][]{ 
      {10.14, 11.24, 44.55, 41.01}, 
      {12.10, 14.21, 52.14, 50.44}, 
      {14.44, 16.12, 45.42, 47.55} 
    }

That is, you convert an String to an double 2-dimensional array.

HOW

At first glance, it seems very simple to implement 1, according to the convention to first paste the code:

String str = "{{10.14, 11.24, 44.55, 41.01},{12.10, 14.21, 52.14, 50.44},{14.44, 16.12, 45.42, 47.55}}";
		str = str.replace("{", "[").replace("}", "]");
		String[][] arr = JSON.parseObject(str, String[][].class);
		Double[][] ds = new Double[arr.length][arr[0].length];
		for(int j=0;j<arr.length;j++){
			for(int i=0;i<arr[0].length;i++){
				ds[j][i] = Double.valueOf(arr[j][i]);
			}
		}

There are a couple of things to notice about this

1. Replace the curly braces with the brackets,

2. Using the JSON conversion, first convert to a 2-dimensional array of String

3. Then convert the values in the array to Double

4. The JSON package I use is fastjson

import com.alibaba.fastjson.JSON;