Re: what do you mean I can't (someObj instanceof MyGenericType) ?

From:

Danno <dh.evolutionnext@gmail.com>

Newsgroups:

comp.lang.java.programmer

Date:

Fri, 10 Aug 2007 22:22:17 -0000

Message-ID:

<1186784537.292378.52380@q4g2000prc.googlegroups.com>

On Aug 10, 2:43 pm, Sideswipe <christian.bongio...@gmail.com> wrote:

if(T instanceof arg) ... // compile error

public static <T> void testElement(T t) {
        if (t instanceof String) {
            System.out.println("t is a String");
        }
    }

Yeah that works

if(T.class.isAssignableFrom(arg.getClass())) // compile error

Looks like that works too.
if(t.getClass().isAssignableFrom(String.class))
System.out.println("Weee");

public interface I {
  public void method1(Object arg);

}

public class C<T> implements I {
  public void method1(Object arg);
    // If arg is of type T, use it, otherwise ignore it
    // Note: I can't use T.class to compare because T doesn't exist at
runtime
    T var = null;
    try {
      var = (T)arg;
    }
    catch (ClassCastException e) {
        return;
    }

    ... some more code here
  }

}

public class C<T> {
    public void method1(T arg) { //arg is of type T
        //There is no need to test. T
        // is going be what you declare for in the first place.
    }
}