new string creates how many objects?

Question

if I write a below code

Scenario-1 [Initially no value in string constant pool]

String s1 = new String("test");

then how many object created?

As per my answer : two object created :: one is in string literal pool and other is in heap because of new reference : refer link

why char[] show in refer link

Scenario-2 [Initially no value in string constant pool]

String s1 = "test";
String s2 = new String("test");

then how many object created?

As per my answer : three object created :: one is in string literal pool for s1 and second is in heap because of new for s2 and third is char[] for s2 reference : refer link

my answer is correct?? please give me exact idea for this which one is right??

hope this answers your question. https://stackoverflow.com/questions/3052442/what-is-the-difference-between-text-and-new-stringtext — Nakul Gawande, May 23 '18 at 05:57
You should read [this article](https://www.todaysoftmag.com/article/1706/common-misconception-how-many-objects-does-this-create). — Andy Turner, May 23 '18 at 06:28
"Scenario-1 [Initially no value in string constant pool]" but there *is* a value in the constant pool already - the literal `"test"`. — Andy Turner, May 23 '18 at 06:30
in scenario 2 there are 3 object created as per https://stackoverflow.com/questions/19672427/string-s-new-stringxyz-how-many-objects-has-been-made-after-this-line-of is it right? — vishal patel, May 23 '18 at 06:59
interned object mean which object?? char[] of string class? as per last comment for scenario 1 there created 3 object also? — vishal patel, May 23 '18 at 07:09
It would have been clear by now if you would have looked at the `String.java` class Would prefer you to go through the article as well (one suggested by @AndyTurner ) — Yati Sawhney, May 23 '18 at 07:26

Yati Sawhney · Answer 1 · 2018-05-23T07:30:39.173

0

String s1 = new String("test");

JVM creates two objects one on heap and other in constant pool.

String s1 = "test";  //Line 1
String s2 = new String("test"); //Line 2

Line 1 will create an object in constant pool if not already present. Line 2 will create only on heap because one is already there in the pool

If you look at the String class you will find that it initializes a final char[] to create an immutable object but those are confined to instantiation:

public final class String
    implements java.io.Serializable, Comparable<String>, CharSequence {
    /** The value is used for character storage. */
    private final char value[];

    .
    .
    .

    /**
     * Initializes a newly created {@code String} object so that it represents
     * an empty character sequence.  Note that use of this constructor is
     * unnecessary since Strings are immutable.
     */
    public String() {
        this.value = "".value;
    }

    .
    .
    .
}

edited May 23 '18 at 07:30

answered May 23 '18 at 05:24

Yati Sawhney

1,372
1
12
19

for second scenario :: As per this answer there will be a 3 object created https://stackoverflow.com/questions/19672427/string-s-new-stringxyz-how-many-objects-has-been-made-after-this-line-of – vishal patel May 23 '18 at 05:30
char[] is something that should not matter to you. When you ask how many objects are gettin created? This simply means that how many string object are getting created at the end of execution of this statement – Yati Sawhney May 23 '18 at 05:34
@vishalpatel There are three objects in your example. – utkusonmez May 23 '18 at 05:35
with string total 3 object created ?? – vishal patel May 23 '18 at 05:37
@vishalpatel I have updated my answer – Yati Sawhney May 23 '18 at 05:38
@downvoter reason?? – Yati Sawhney May 23 '18 at 07:00

new string creates how many objects?

1 Answers1