class A {
    int id;
    public A(int id) {
        this.id = id;
    }
}

public class Test0 {
  public static void main(String[] args) {
    A a1 = new A(20);
    int i = a1.id;
    System.out.println(i);
  }
} 

class A {
    Object id;
    public A(Object id) {
        this.id = id;
    }
}

public class Test1 {
  public static void main(String[] args) {
    A a1 = new A(20);
    int i = (Integer)a1.id;
    System.out.println(i);
    A a2 = new A("hello");
    String s = (String)a2.id;
    System.out.println(s);
  }
} 

class A<T> {
    T id;
    public A(T id) {
        this.id = id;
    }
}

public class Test2 {
  public static void main(String[] args) {
    A<Integer> a1 = new A<Integer>(20);
    int i = a1.id;
    System.out.println(i);
    A<String> a2 = new A<Integer>("hello");
    String s = a2.id;
    System.out.println(s);
  }
} 

class A<T> {
    T id;
    public A(T id) {
        this.id = id;
    }
}

public class Test2 {
  public static void main(String[] args) {
    A<Integer> a1 = new A<>(20);
    int i = a1.id;
    System.out.println(i);
    A<String> a2 = new A<>("hello");
    String s = a2.id;
    System.out.println(s);
  }
} 

class Parent {}
class Child extends Parent {}
class Grandson extends Child {}

class A<T extends Parent> {
  T item;
  public A(T item) {
    this.item = item;
  }

  public T getItem() {
    return item;
  }
}

public class Test3 {
  public static void main(String[] args) {
    A<Parent> a1 = new A<>(new Parent());
    A<Child> a2 = new A<>(new Child());
    A<Grandson> a3 = new A<>(new Grandson());

    Parent p = a1.getItem();
    Child c = a2.getItem();
    Grandson g = a3.getItem();
  }
}

class A {
   Parent item;

   public A(Parent var1) {
      this.item = var1;
   }

   public Parent getItem() {
      return this.item;
   }
}

public class Test3 {
   public static void main(String[] var0) {
      A var1 = new A(new Parent());
      A var2 = new A(new Child());
      A var3 = new A(new Grandson());
      Parent var4 = var1.getItem();
      Child var5 = (Child)var2.getItem();
      Grandson var6 = (Grandson)var3.getItem();
   }
}

class Parent {}
class RunnableChild extends Parent implements Runnable, Cloneable{
  public void run() {}
  public int compareTo() {return 1;}
}

class A<T extends Parent & Runnable & Cloneable> {
  T item;
  public A(T item) {
    this.item = item;
  }

  public T getItem() {
    return item;
  }
}

public class Test4 {
  public static void main(String[] args) {
    A<RunnableChild> a2 = new A<>(new RunnableChild());

    RunnableChild r1 = a2.getItem();
    Runnable r2 = a2.getItem();
    Cloneable c = a2.getItem();
  }
}