泛型

  /**
  测试泛型
  */
  public class TestGeneric {
  public static void main(String[] args) {
      
      MyCollection<String> mc = new MyCollection<String>();
      
      mc.set("老王", 0);
      
      String b = mc.get(0);
      
      System.out.println(b);
        }
}

class MyCollection<E> {    //容器
    Object[] objs = new Object[5];
  
  public void set(E e, int index) {
      objs[index] = e;
  }
  
  public E get(int index) {
      return (E)objs[index];
  }
}