I want to use a global variable.
Attribute can be used like a global variable, but
If it is not saved by the if conditional statement, the attribute is initialized to 0.

////////////////////////////////
if(////...)
{
@ABC = 0;
}
{

}

Attributes on the input item must match. Mis-matched attributes are initialized with 0. You can work around this to some extent by force-initializing a value like -1:


String attributes are initialized with "", empty value.