fork download
copy 
  1. import java.lang.reflect.Array;
  2. import java.lang.*;
  3.  
  4. class Ideone {
  5.     static <T> T[] getGenericArray(T... a) {
  6.         return a;
  7.     }
  8.  
  9.     static <T> void genericArrayFailure(T... a) {
  10.         Object[] objectArray = a;
  11.         objectArray[0] = 1;
  12.         T t = a[0];
  13.     }
  14.  
  15.     static <T> T[] getGenericArrayReflexionAPI(T a, T b, T c) {
  16.         T[] array = (T[]) Array.newInstance(a.getClass(), 3);
  17.         array[0] = a;
  18.         array[1] = b;
  19.         array[2] = c;
  20.         return array;
  21.     }
  22.  
  23.     public static void main (String[] args) throws java.lang.Exception
  24.     {
  25.         String[] stringArray = getGenericArray("1", "2", "3");
  26.         // class [Ljava.lang.String;
  27.         System.out.println(stringArray.getClass());
  28.  
  29.         stringArray = getGenericArrayReflexionAPI("1", "2", "3");
  30.         // class [Ljava.lang.String;
  31.         System.out.println(stringArray.getClass());
  32.  
  33. 		// Exception in thread "main" java.lang.ArrayStoreException: java.lang.Integer
  34.         genericArrayFailure("1", "2", "3");
  35.     }
  36. }
Runtime error #stdin #stdout #stderr 0.09s 32792KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
class [Ljava.lang.String;
class [Ljava.lang.String;
stderr
copy 
Exception in thread "main" java.lang.ArrayStoreException: java.lang.Integer
	at Ideone.genericArrayFailure(Main.java:11)
	at Ideone.main(Main.java:34)
https://ideone.com/3lYbKB
language:
Java (HotSpot 12)
created:
4 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!