String objects

[pradeepta chopra]

it is said that if we declare a atring object like
String ab="abc";
then the jvm will first check the String constant pool for the existence of some object with value "abc",if it exists it will assign it to ab else a new object is created.
but when we use new keyword to make a new object like
String ab=new String("abc");
then memory from non-String pool is assigned to the object and a new object is created.
QUESTION:
what if we use the new keyword but the constant pool already contains a literal entry of "abc".
then will the jvm create a new object without checking the pool or not.
and to which object will the ref variable ab refer to??

[Gamini Sirisena]

As far as I know if you use the new keyword a new object will be created outside of the string pool and no checking of the string pool is peformed.

It's better if you can a write small program to verify this anyway.

[pradeepta chopra]

how do i verify that to which object is it refering to??
and is it from the string pool or not

[Vijitha Kumara]

Use "==" to check whether two String objects refer to the same memory location or not. That's the best way you can check this according to my knowledge.

String s1 = "abc";
String s2 = new String("abc");
String s3 = s1;
 
System.out.println(s1==s2);
System.out.println(s2==s3);
System.out.println(s1==s3);
    

will result

 
false
false
true   

Try it with different ways you want.

[pradeepta chopra]

ohk, thanks Vijitha Kumara

[Jesper de Jong]

When you create a String object with the "new" keyword, you will always get a new String object that is not in the pool, no matter if there's already a string in the pool with the same contents or not.

You can call intern() on a String object. That method returns a reference to a String object in the following way: If there's a string in the pool with the same content, then it returns the existing string in the pool; if it's not in the pool, then a new string is created in the pool and a reference to that new pooled string is returned. See the API documentation for more information.