How many objects are created?? In java.

Question

String s="hey";
String s1="hey";
String s2=new String("hey");
String s3 =new String("hey");
no. of objects. explain how? 👍

Answer 1

String s="hey";//object 1
String s1="hey";//referring to object 1
String s2=new String("hey");//object 2
String s3 =new String("hey");//object 3

Answer 2

3 Strings were created.
s1 points to s in the SCP.
s2 and s3 used 'new' without interning the String. Thus are created as separate Strings.

Keep in mind this is not the number of Objects created.
Strings use a char[] to keep track of each character (The value of the String).
So, 2 Objects were created when s was.

I think (not 100% sure), the char[]'s from s1, s2 and s3 would all use the same reference from the pooled s. So, 4 objects would be created in total.
If I'm wrong about that happening then 6 objects would be created. 2 for each String, the String itself and the char[] it uses internally.

There is also a possibility of local variables that create objects in the String classes constructor. Which could mean even more objects would be created. Although, those would be temporary.

Answer 3

unfortunately false, but near correct. let me help you, only s and s1 referring to same memory location.
s2 and s3 are referring to be memory location that contains "hey".

Answer 4

No fella, and no 4 no 6 this is wrong answer.

Answer 5

correct answer is 3,
Two with new keyword s2 and s3 and
one which referred by s and s1.

Answer 6

Indeed, as part of making a String a character array is created - the constructor from the source code:

public String() {
         this.offset = 0;
         this.count = 0;
         this.value = new char[0];
 }

http://grepcode.com/file/repository.grepcode.com/java/root/jdk/openjdk/6-b14/java/lang/String.java

Other constructors create non-zero size arrays as required, so Rrestoring Faith is correct to say 3 Strings are created but more than 3 objects are created

Answer 7

this is right answer fella. only 3 object e using new and one when creating variable.

Answer 8

i don't know what backing array you are talking about. String is created in String pool.

Answer 9

I posted a link to the source code, behind the scenes a String has an array of characters, which is itself an object. Therefore any String object implicitly refers to an array object too

Answer 10

Yes 3 String objects are created :)

Answer 11

(am i right?)
number of instances = 6
number of objects = 4
string is immutable

Answer 12

String s="hey";//object 1 and creates a backing array object 2
String s1="hey";//referring to object 1
String s2=new String("hey");//object 3 and creates a backing array object 4
String s3 =new String("hey");//object 5 and creates a backing array object 6

As previous answer said, in some cases the backing arrays might be the same reducing the number slightly