import java.util.*;
import java.lang.reflect.*;
 
class Example {
    public static void main(String[] args) {
        {
            ArrayList<Long> al = new ArrayList<Long>();
            printTypeInfo("ArrayList<Long> al = new ArrayList<Long>();", al);
        }
        {
            ArrayList<Long> al = new ArrayList<Long>() {};
            printTypeInfo("ArrayList<Long> al = new ArrayList<Long>() {};", al);
        }
    }
 
    private static void printTypeInfo(String declaration, ArrayList<Long> al) {
        System.out.println(declaration);
 
        printTypeInfo("al.getClass()",
                       al.getClass());
        printTypeInfo("al.getClass().getGenericSuperclass()",
                       al.getClass().getGenericSuperclass());
 
        Type actualTypeArgument =
            ((ParameterizedType)
                al.getClass()
                  .getGenericSuperclass())
                  .getActualTypeArguments() [0];
        printTypeInfo("al.getClass().getGenericSuperclass().getActualTypeArguments()[0]",
                       actualTypeArgument);
    }
 
    private static void printTypeInfo(String expr, Type t) {
        System.out.printf("  %s%n", expr);
        System.out.printf("    is an instance of '%s'%n", t.getClass().getSimpleName());
        System.out.printf("    representing the type '%s'", t.getTypeName());
 
        if (t instanceof Class<?> && ((Class<?>) t).isAnonymousClass()) {
            System.out.printf(" (anonymous subclass of %s)%n", ((Class<?>) t).getSuperclass().getName());
        } else {
            System.out.println();
        }
    }
}

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