Question

I am casting my String variables to integer and double. I want to check whether the String variable contains valid Integer or Double value at runtime.

I us following code but it not works for me.

String var1="5.5";
String var2="6";
Object o1=var1;
Object o2=var2;
if (o1 instanceof Integer)
{
    qt += Integer.parseInt( var1);// Qty
}
if (o2 instanceof Double)
{
    wt += Double.parseDouble(var2);// Wt
}

Answer 1

Try to parse the int and catch the exception if it fails:

String var1="5.5";

try {
 qt += Integer.parseInt( var1);
}    
catch (NumberFormatException nfe) {
// wasn't an int
}