将字符串转换为用非数字字符拆分的双精度数组

Question

I know how I can split a string with a special character like space:

String numbers = "22 14 10 8 70";
int [] n1 = new int [numbers.length()];
for(int n = 0; n < numbers.length(); n++) {
    n1[n] = Integer.parseInt(numbers.split(" ")[n]);
}

But I want to split String with any non-number(also negative sign and floating point) type of characters; like this string:

String numbers = "22+14/10*8-70";

Answer 1

Try this algorithm Shunting-yard algorithm .

The shunting-yard algorithm is a method for parsing mathematical expressions specified in infix notation.

Answer 2

You can also transform the available expression first to Postfix expression and then evaluate it. Here is an explanation about it.

Answer 3

String.split() can split over a regex string:

String numbers = "22+14/10*8-70";
String[] elements = numbers.split("[^0-9\\.]");
for(String e : elements)
{
    System.out.println("Element: " + e);
}

Prints:

Element: 22
Element: 14
Element: 10
Element: 8
Element: 70