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?
Asked
Active
Viewed 99 times
1
Maroun
- 94,125
- 30
- 188
- 241
yogesh2510
- 81
- 1
- 1
- 3
-
No way to know. Maybe 0 or 1 – Ingo Dec 01 '13 at 14:13
-
possible duplicate of http://stackoverflow.com/questions/7370593/how-many-string-objects-will-be-created – Dec 01 '13 at 14:15
-
Two, unless you count the internal objects in the StringBuilder instance. – Hot Licks Dec 01 '13 at 15:24
1 Answers
1
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.
Maroun
- 94,125
- 30
- 188
- 241
-
-
So the objects would be `a`, `b`, `c`, an anonymous `StringBuilder`, and `d`? – joshreesjones Dec 01 '13 at 14:29
-
1@mathguy54 - You're not paying attention. a, b, and c are literals. They were created when the class was loaded. – Hot Licks Dec 01 '13 at 15:25
-
1LOL! StackOverflow, or how to get my degree without ever turning on my brain! – Samuel Dec 01 '13 at 15:34
-
So there is only one object created - `StringBuilder`? Sorry for being ignorant... – joshreesjones Dec 01 '13 at 16:10
-
1@mathguy54 -- Two, the StringBuilder and the String value assigned to d. – Hot Licks Dec 01 '13 at 18:59
-
dear i know after execution of complete programme their will be only on object create, but i want ot know, how many object will created in the heap memory with reference or without reference. – yogesh2510 Dec 04 '13 at 10:34