How many objects will be create for the following string on the heap:
String a = "abc"; String b = "def"; String c = "ghi"; String d = a+b+c How many objects are created on the heap?
- No way to know. Maybe 0 or 1Ingo– Ingo2013-12-01 14:13:11 +00:00Commented Dec 1, 2013 at 14:13
- possible duplicate of stackoverflow.com/questions/7370593/…user2056437– user20564372013-12-01 14:15:43 +00:00Commented Dec 1, 2013 at 14:15
- Two, unless you count the internal objects in the StringBuilder instance.Hot Licks– Hot Licks2013-12-01 15:24:04 +00:00Commented Dec 1, 2013 at 15:24
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1 Answer
String a = "abc"; //String literal String b = "def"; //String literal String c = "ghi"; //String literal String d = a+b+c //String d = new StringBuilder(d).append(b).append(c).toString(); Note that StringBuilder#append returns an object. Now it's easy for you to determine how many objects were created..
Also note that toString doesn't create a new String, it returns an already created one.
7 Comments
joshreesjones
Does
new StringBuilder() count as object?joshreesjones
So the objects would be
a, b, c, an anonymous StringBuilder, and d?
Hot Licks
@mathguy54 - You're not paying attention. a, b, and c are literals. They were created when the class was loaded.
Samuel
LOL! StackOverflow, or how to get my degree without ever turning on my brain!
Hot Licks
@mathguy54 -- Two, the StringBuilder and the String value assigned to d.
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