Java Generics with Lists

Class1.java

import java.util.*;
import java.lang.reflect.*;

public class Class1 {
    public int x;
    
    public Class1() {
        // Default Constructor
    }
    
    public Class1(int x) {
       this. x = x;
    }
    
    public static void main(String args[]) {
        check1();
        check2();
    }
    
    public static void check1() {
        try {
            List<Class1Extension> c1l = getList(Class1Extension.class);
            System.out.println(c1l.get(0).getClass());
            System.out.println(c1l.get(0).x);
        } catch (Exception e) {
            
        }
    }
    
    public static void check2() {
        List<Class2Extension> c2elist = new ArrayList<>();
        c2elist.add(new Class2Extension());
        List<Class1Extension> c1elist = convertList(c2elist, Class1Extension.class);
        System.out.println(c1elist.get(0).getClass());
        
        List<Class2> c2list = new ArrayList<>();
        c2list.add(new Class2());
        List<Class1> c1list = convertList(c2list, Class1.class);
        System.out.println(c1list.get(0).getClass());
    }
    
    public static <T extends Class1, E extends Class2> List<T> convertList(List<E> class2List, Class<T> clazz) {
    	List<T> class1List = new ArrayList<>();
    
    	for (E class2 : class2List) {
    		class1List.add((T) class2.getClass1());
    	}
    
    	return class1List;
    }
    
    public static <T extends Class1> List<T> getList(Class<T> clazz) throws InvocationTargetException, NoSuchMethodException, InstantiationException, IllegalAccessException {
    	List<T> class1List = new ArrayList<>();
    
    	for (int i = 0; i < 100; i += 1) {
    		class1List.add(clazz.getConstructor(int.class).newInstance(i));
    	}
    
    	return class1List;
    }
}

class Class1Extension extends Class1 {
    public Class1Extension() {
        
    }
    
    public Class1Extension(int x) {
        this.x = x + 1;
    }
}

class Class2 {
    public int y;
    
    public Class1 getClass1() {
        return new Class1();
    }
}

class Class2Extension extends Class2 {
    public Class1Extension getClass1() {
        return new Class1Extension();
    }
}