1 public class Test<T> { 2     private T obj; 3     public Test(T obj){ 4         this.obj = obj; 5     } 6     public T getObj(){ 7         return this.obj; 8     } 9     public void setObj(T obj){10         this.obj = obj;11     }12     public void showType(){13         System.out.println("the type is:" + obj.getClass().getName());14     }15     public static void main(String[] args) {16         Test<String> test1 = new Test<String>("string");17         test1.showType();18         Test<Integer> test2 = new Test<Integer>(24);19         test2.showType();20     }21     22 23 }