在Java中将String转换为浮点数

Question

I'm trying to convert the string pprice to a floating point number. However, the object's price attribute(floating pt type) is setting as 0.00.. Can someone pls tell me what's wrong?

String pprice="60.0"
String tokens[]=pprice.split(".");
if(tokens.length>=2)
{
    int a=Integer.parseInt(tokens[0]);
    int b=Integer.parseInt(tokens[1]);
    float a1=(float)a;
    float b1=(float)b;
    Float price=a1+(b1/100);
    prod.setProductPrice(price);
}
else if(tokens.length==1)
{
    int a=Integer.parseInt(tokens[0]);
    float a1=(float)a;
    prod.setProductPrice(a1);
}

Answer 1

使用Double.parseDouble（string）或Float.parseFloat（string）;

Answer 2

Your problem is here:

    String tokens[]=pprice.split(".");

The argument to split is a regular expression, and "." is a regular expression that matches any single character . To match only the dot, you need to escape it with a backslash, and since the backslash is also special, you need to double it.

    String tokens[]=pprice.split("\\.");

Change that and your code should work.

You'd probably be better off using one of the parse methods mentioned in the other answers.

Answer 3

Let's try float.parseFloat("60.0"); or Double.parseDouble("60.0");

Answer 4

Why don't you use something like:

float price = Float.valueOf(pprice.trim());

(equivalent to Float.parseFloat(string))

Answer 5

float urfloat=Float.parseFloat(String string)