Syntax aside, is there any difference between the following two statements?
String[] str = { "test" };
and
String[] str = new String[] {"test"};
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You can't break the first into multiple statements. That's all.Bhesh Gurung– Bhesh Gurung2014-01-16 19:38:12 +00:00Commented Jan 16, 2014 at 19:38
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No, this is just a shortcut syntax. And you can check by seeing the bytecode produced by this two snippet of code.Alexis C.– Alexis C.2014-01-16 19:41:16 +00:00Commented Jan 16, 2014 at 19:41
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3 Answers
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
Comments
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.
Comments
No, there isn't.
String[] str = { "test" };
Will be interperated by the JVM as
String[] str = new String[] {"test"};
