How to check type of variable in Java?

Question

How can I check to make sure my variable is an int, array, double, etc...?

Edit: For example, how can I check that a variable is an array? Is there some function to

Answer 1

I hit this question as I was trying to get something similar working using Generics. Taking some of the answers and adding getClass().isArray() I get the following that seems to work.

public class TypeTester {

 String tester(T ToTest){

    if (ToTest instanceof Integer) return ("Integer");
    else if(ToTest instanceof Double) return ("Double");
    else if(ToTest instanceof Float) return ("Float");
    else if(ToTest instanceof String) return ("String");
    else if(ToTest.getClass().isArray()) return ("Array");
    else return ("Unsure");
}
}

I call it with this where the myArray part was simply to get an Array into callFunction.tester() to test it.

public class Generics {
public static void main(String[] args) {
    int [] myArray = new int [10];

    TypeTester callFunction = new TypeTester();
    System.out.println(callFunction.tester(myArray));
}
}

You can swap out the myArray in the final line for say 10.2F to test Float etc