1 package com.xt.thinks15_7;
 2 
 3 import java.util.Arrays;
 4 
 5 class EraseObject1<A> {
 6 
 7 }
 8 
 9 class EraseObject2<A, B> {
10 
11 }
12 
13 class EraseObject3<K, V> {
14 
15 }
16 
17 /**
18  * 擦除测试
19  * 
20  * @author Administrator
21  *
22  */
23 public class ErasedTest {
24     public static void main(String[] args) {
25         EraseObject1<Integer> eo1 = new EraseObject1<Integer>();
26         EraseObject2<Object, String> eo2 = new EraseObject2<Object, String>();
27         EraseObject3<String, Integer> eo3 = new EraseObject3<String, Integer>();
28         System.out.println(Arrays.toString(eo1.getClass().getTypeParameters()));
29         System.out.println(Arrays.toString(eo2.getClass().getTypeParameters()));
30         System.out.println(Arrays.toString(eo3.getClass().getTypeParameters()));
31     }
32 }

运行结果：

[A]
[A, B]
[K, V]

从运行结果可以看出这里new的新对象中的泛型类型在打印的时候是无法知晓被擦除了的