Search Interview Questions |  More than 3000 questions in repository. There are more than 900 unanswered questions. Click here and help us by providing the answer. Have a video suggestion. Click Correct / Improve and please let us know. |
|
|||
|
| |||||
| Core Java - Interview Questions and Answers for 'String immutable' - 3 question(s) found - Order By Newest | |||||
| |||||
| Ans. String is widely used as parameter for many java classes, e.g. network connection, opening files, etc. Making it mutable might possess threats due to interception by the other code segment or hacker over internet. Once a String constant is created in Java , it stays in string constant pool until garbage collected and hence stays there much longer than what's needed. Any unauthorized access to string Pool pose a threat of exposing these values. | |||||
| Help us improve. Please let us know the company, where you were asked this question : | |||||
 Discuss Correct / Improve  Security String pool string immutable immutability  expert  rare | |||||
 Related Questions | |||||
 What are different ways to create String Object? Explain. | |||||
| Why Char array is preferred over String for storing password? | |||||
| What is a String Pool ? | |||||
| Which memory segment holds String Pool in Java ? | |||||
| How and Why Strings are interned in Java ? | |||||
| What will be the output of following code Integer x = 1; Integer y = 2; System.out.println(x == y); What if you change 1 to "1" and Integer to String? | |||||
| What will be result of following code and why Integer int1 = 1; Integer int2 = 1; String str1 = new String("str"); String str2 = new String("str"); String str3 = "str"; String str4 = "str"; System.out.println(int1 == int2); System.out.println(str1 == str2); System.out.println(str3 == str4); | |||||
| What is the purpose of String Pool ? Don't you think it's a performance overhead to have unnecessary check for string in string pool ? | |||||
| Why string pool concept has been introduced in string ? | |||||
| |||||
| Ans. Because it doesn't make the change in the existing string but would create a new string by concatenating the new string to previous string. So Original string won't get changed but a new string will be created. That is why when we say str1.concat("Hello"); It means nothing because we haven't specified the reference to the new string and we have no way to access the new concatenated string. Accessing str1 with the above code will still give the original string. | |||||
| Help us improve. Please let us know the company, where you were asked this question : | |||||
| Discuss Correct / Improve string string immutable immutability string concat | |||||
| Related Questions | |||||
| Why is String immutable in Java ? | |||||
| How does making string as immutable helps with securing information ? How does String Pool pose a security threat ? | |||||
| Why shouldn't we use string concatenation extensively or in a loop ? | |||||
| |||||
| Ans. Because String being an immutable object creates a new object upon each concatenation cycle. If there is any such need , we should use String Builder whose objects are mutable. | |||||
| Help us improve. Please let us know the company, where you were asked this question : | |||||
Discuss Correct / Improve string string immutable immutability for loop control statements loop statement  Asked in 1 Companies | |||||
| Related Questions | |||||
| Why is String immutable in Java ? | |||||
| How does making string as immutable helps with securing information ? How does String Pool pose a security threat ? | |||||
| How is string object immutable if we can concat a string to it ? | |||||
