how come generis type information at runtime/reflection ?

[Seetharaman Venkatasamy]

Hi Folks,

Compiler erase/remove all generic information at compiletime i.e, compiler do not put generic type information into the compiled code is called Type erasure right?. In contrast to this, look at this discussion
https://coderanch.com/t/383648/java/java/java-reflection-element-type-List

As, Jim stated[it is working, agreed] how the generic information stored in class file?

[David O'Meara]

See this too
https://coderanch.com/t/518731/java/java/Generics-collections-reflection

[Seetharaman Venkatasamy]

Sorry David! not getting you clearly!

[David O'Meara]

I think it is best to trust in Jim.

public class TestRun
{
    private Set<Integer> set;
    private String string;
    public List<String> collection;
    private Set<Boolean> hs;
    private Map<Boolean, String> hm;

    public static void main(final String[] args)
    {
        final Class<TestRun> klass = TestRun.class;
        for (final Field field : klass.getDeclaredFields())
        {
            System.out.println(field.getName() + " " + field.getType());
            final Type t = field.getGenericType();
            if (t instanceof ParameterizedType)
            {
                for (final Type inner : ((ParameterizedType) field.getGenericType()).getActualTypeArguments())
                {
                    System.out.println("   " + inner);
                }
            }
        }
    }
}