public class Pratice{
    public static void main(String[] args){
        double [][]dTS1;
        String firstS = "1,2;3,4,5,;6,7,8";
        String []tS1 = firstS.split(";");
        
        dTS1 = new double [tS1.length];//这里为什么会出错？？？？？
        for(int i = 0; i < tS1.length; i++){
            String []tS2 = tS1[i].split(",");
            dTS1 [i] = new double [tS2.length];
            for(int j = 0; j < tS2.length; j++){
                dTS1[i][j]= Double.parseDouble(tS2[j]);
            }
        }
    }
        
}

new double [tS1.length][];