我在文本框中输入"0.4,0.18,0.1,0.1,0.07,0.06,0.05,0.04",想让 double weight[]={0.4,0.18,0.1,0.1,0.07,0.06,0.05,0.04};

Question

 double weight[]={0.4,0.18,0.1,0.1,0.07,0.06,0.05,0.04};这里有8个数,还想让n=8;

Answer 1

String[] arr = String.split(",");
double[]  width = new double[arr.length]；
for(){
  width[i] = Double.parseDouble(arr[i]);
}

Answer 2

1.下载MVEL.它就像javascript中的Eval2.类似这样.代码不一定对,需要测试.
double weight[]= null;
MVEL.eval("weight={"+你的文本框中填写的东东+"};"); 

Answer 3

利用split(",")分割文本框中的字符串为字符数组
在逐个将字符串转成double型

Answer 4

double[]  width= new double[arr.length]； //编译错误，width不是我要变量weight吧？
for()for中可以不要参数吗

Answer 5

double weight[]={0.4,0.18,0.1,0.1,0.07,0.06,0.05,0.04};
int n = weight.length;

Answer 6

String s = "0.4,0.18,0.1,0.1,0.07,0.06,0.05,0.04";  //s = JTextField.getText();
String[] ss = s.split("\\s\\,\\s");
double[] weight = new double[ss.length];
for (int i = 0; i < ss.length; i++) {
weight[i] = Double.parseDouble(ss[i]);
}