CODEWITHSUNDEEP
javaarrays
abc32112
abc32112

Reputation: 2527

Array initialization and the "new" keyword

Syntax aside, is there any difference between the following two statements?

String[] str = { "test" };

and

String[] str = new String[] {"test"};

Upvotes: 1

Views: 92

Answers (3)

NPE
NPE

Reputation: 500475

Let's see:

// String[] str1 = { "test" };
   0: iconst_1      
   1: anewarray     #16                 // class java/lang/String
   4: dup           
   5: iconst_0      
   6: ldc           #18                 // String test
   8: aastore       
   9: astore_1      

// String[] str2 = new String[] {"test"};
  10: iconst_1      
  11: anewarray     #16                 // class java/lang/String
  14: dup           
  15: iconst_0      
  16: ldc           #18                 // String test
  18: aastore       
  19: astore_2

As you can see, they compile to identical bytecodes.

Note that outside intiailizations you generally have to use the second form.

Upvotes: 4

Petr Mensik
Petr Mensik

Reputation: 27516

No, there is no difference. Except if you want to pass it to the method 

methodWhichAcceptsArray({"a", "b"}); //won't compile
methodWhichAcceptsArray(new String[] {"a", "b"}); //ok

Upvotes: 4

Orel Eraki
Orel Eraki

Reputation: 12196

No, there isn't.

String[] str = { "test" };

Will be interperated by the JVM as

String[] str = new String[] {"test"};

Upvotes: 2

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