Get type of a generic parameter in Java with reflection

Question

Is it possible to get the type of a generic parameter?

An example:

public final class Voodoo {
    public static void chill(List aListWithTy         


        

Answer 1

You can get the type of a generic parameter with reflection like in this example that I found here:

import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;

public class Home {
    @SuppressWarnings ("unchecked")
    public Class getTypeParameterClass(){
        Type type = getClass().getGenericSuperclass();
        ParameterizedType paramType = (ParameterizedType) type;
        return (Class) paramType.getActualTypeArguments()[0];
    }

    private static class StringHome extends Home{}
    private static class StringBuilderHome extends Home{}
    private static class StringBufferHome extends Home{}   

    /**
     * This prints "String", "StringBuilder" and "StringBuffer"
     */
    public static void main(String[] args) throws InstantiationException, IllegalAccessException {
        Object object0 = new StringHome().getTypeParameterClass().newInstance();
        Object object1 = new StringBuilderHome().getTypeParameterClass().newInstance();
        Object object2 = new StringBufferHome().getTypeParameterClass().newInstance();
        System.out.println(object0.getClass().getSimpleName());
        System.out.println(object1.getClass().getSimpleName());
        System.out.println(object2.getClass().getSimpleName());
    }
}