Get “real” class of generic type

Question

How can I get the \"real\" class of a generic type?

For Example:

public class MyClass {
    public void method(){
        //something

        S         


        

Answer 1

If you have a instance variable of type T in your class, and it happens to be set, then you could print the class of that variable.

public class Test {

    T var;

    public static void main(String[] args) {
        Test a = new Test();
        System.out.println(a.boo());
        a.setVar(new Integer(10));
        System.out.println(a.boo());
    }

    public String boo() {
        if (var == null) {
            return "Don't know yet";
        }
        return var.getClass().getSimpleName();
    }

    public void setVar(T var) {
        this.var = var;
    }

    public T getVar() {
        return var;
    }
}