java - Is there a performance issue using a temporary variable? -

i have question creating new object in java.

lets have methos called: foo(string[] a)

i want pass foo new string[] thats 1 use better

performance 1 or 2

1.

string[] = new string[]{"a"};  foo(a); 

2.

foo(new string[]{"a"}); 

thanks helping

you can check bytecode:

1.

  public static void main(java.lang.string[]);     code:        0: iconst_0              1: anewarray     #2                  // class java/lang/string        4: astore_1              5: aload_1               6: invokestatic  #3                  // method foo:([ljava/lang/string;)v        9: return  

2.

  public static void main(java.lang.string[]);     code:        0: iconst_0              1: anewarray     #2                  // class java/lang/string        4: invokestatic  #3                  // method foo:([ljava/lang/string;)v        7: return   

the difference in (2), no references stored (astore_1) , none need loaded (aload_1). not cause performance difference (and shouldn't worry such minuscule optimizations anyway), might use option (2) if you're not going reference a again in program (as mentioned in your comment) and there no readability infringement.

i think readability component quite important: rather create variable store array (even if i'll never reference variable more once) have 1 super-long, unreadable line. of course, in example, there no issue readability, it's consider when more complicated situations arise.