Hi How can I change an array list to integer or double? this is my code and i want show answer like a number and i use it not just print it ...

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To format a Java float or double with printf, follow the same steps to format an integer with the following two addendums: The conversion specifier for a floating point number is %f, not %d.

The Java Shell assumes that age is a variable, but it doesn’t know its type. You would have to include a type; for example, see what happens if you enter int age. How to write compound expressions ...