FactorySample.java

public class FactorySample {
    static class Hoge{
        public Hoge() {
        System.out.println("Hello wold");
        }
    }
    static <T> T as( Object o ) {
        return (T) o;
    }
    
    static <T> T newInstance(Class<T> klass)throws Exception{
        return klass.newInstance();
    }

    public static void main(String[] args)throws Exception {
        Object x = newInstance(Hoge.class);
        Hoge s = newInstance(Hoge.class);
    }