String is Immutable in Java

#java #string

[medoncho]

You can separate two identical strings by creating them via constructor:
String s1 = "bob";
String s2 = "bob";
String s3 = new String("bob");
s3 would exist in a different pool, no matter if it has the same value. In this case, the == operator would return false for s1 and s3, but true for s1 and s2 because they are compared by address. The .equals() method is used for situations where you need to pass the value.
StringBuilder is good for manipulations, but it's not thread safe as StringBuffer. If you're using a newer version of java, a string treated as StringBuilder will compile as a StringBuilder.

[Sharukkhan-kxrw]

My journey starts with this guy, thanks man

[DiamondSaberYT]

Pretty sure stringbuffer is old and now we use StringBuilder :D

[mohammedraza]

I think you can explain this concept better than what you have explained in this video.
This is way simpler than what you have explained.

[Bestfriend-qs]

If you need to modify your string in runtime, use stringbuffer or stringbuilder. Stringbuffer is more adapted in multi-threading context because it is thread-safe.

[abhishekkute]

Actually when we concatenate one string reference with another it creates new string object in the heap and not stores it in the string pool so if next time if you created new string s2="Navin Reddy" it will create a string in the string pool and if you matched by s1== s2 it will give false

[BinuJasim]

But if s is changed to "Navin Reddy", how is the variable 's' immutable?

[elw]

I don't know Java but, it looks like the example is reassigning s and not actually mutating it. But, I would imagine doing something like s[0] = 'x' would throw an error?

[peachezprogramming]

I'm a Java Developer with 1 year experience. Never have I needed to know this in my daily job. When does this information become necessary?

[complexity]

One more reason java disobeys the memory limit when I tell it not to use 10GB of RAM.

[RK_]

How do we see that it is not changed?
If printing 's' returns full name, what do we print to see the original string?

Didn't fit the right meaning for Immutable concept of strings.

Here is my take,
s[n] where n= 1, 2, 3, 4, 5 etc trying to assign any new value to any position of array doesn't let you change the value.

[adnanhussain]

String buffer is faster than the normal string.

[ItCoursesForAll]

In first u said it will not change but it changed 😅 how

[TuLe-nftq]

What if that heap memory ran out of slot? Can s variable store more value?

[damagee]

If two strings that are the same connect to the same pool, why do we have to use .equals() even though == seems to work just fine?

[undergraduate]

Remember, string is a character array internally in most programming languages.

[shankar]

Coming from javascript I am confused, seems he reassigning s, instead of actually mutating. Ideally we supposed to initalize another variable whose value as s and try to change that variable and make sures s not changing.
Any one explain what he means immutability by that example??

[gordonfreimann]

in which language exactly strings are mutable?

[deivasigamanimurugan]

Navin, i have a doubt, if the String s = "Navin"; s= s+"Reddy"; which creates Navin Reddy, so What will happen for String s= "Navin"; can you explain please