Variables

Question

how to get the variable that is both String and Double.

Answer 1

A variable cannot have two different data types. It can be a string or a double. But you can do this.
String str = "12.5";
double num = Double.parseDouble(str);

First you can create string with double type value but it will be string only and then you can convert it to double.

Answer 2

and then it can calculate as double ,right?

Answer 3

Yes after converting it to double you can perform any arithmetic operations on it.

Answer 4

if I want to check a=me and run like this

String a="me";
if a="me" {
System.out.print("ok");
}

it cant run if because a is string. so how can i do like this? thanks for helping :)