Java.lang.Integer cannot is cast to java.lang.String Java Int,double conversion to string and string to int,double conversions __string

Count=integer.parseint ((String) all.get (0));

Implementation times error: Java.lang.ClassCastException:java.lang.Integer cannot be cast to java.lang.String

Workaround: Change the red-flagged statement to Count=integer.parseint (all.get (0). toString ());

The operational problems of this type of cast often appear in the database query with count (), sum () and other data results, pay attention to the conversion method, to prevent the error.

The conversion of Java int,double to string and the conversion of string to Int,double

Double a=double.valueof (m_textstring). Doublevalue ();//string convert to Double

Str=string.valueof (c);//double,int converted to String

int int=integer.valueof (str);//string converted to int