什么是java-（number）d中的类型变量

Question

I can't cast this value as Integer and I can't file what type is (I know is String ) but I need convert as number, Interger.parse() does not work I get Exception .

String str = "-10d";
Interger.parse(str); //I get Exception

Answer 1

String str = "-10b" (mentioned in question) or "-10d" (mentioned in title)?

If what you mean is -(number)d,then it is double.
try

double b = Double.parseDouble("-10d"); 

instead of using Integer.parseInt

Answer 2

You can use this to convert your String to int .

String str = "-10d";
int i = Double.valueOf(str).intValue();

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Hope this helps!

Answer 3

Here you get the double value:

String str = "-10d";
Double d = Double.parseDouble(str);
System.out.println(d);

And to get the integer value:

int intValue = d.intValue();

Other solutions, which change the input string for the parse method are (I don't recommend them):

int x = Integer.valueOf(str.substring(0, str.length() - 1));
int y = Integer.valueOf(str.replace('d', ' ').trim());

Answer 4

You get Exception because it is not correct there are no Interger.parse(str); i think you want to make :

Integer.parseInt(str);

But your string have d and d work with Double not with Integer so instead use this :

String str = "-10d";
Double.parseDouble(str);