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|Java - Interview Questions and Answers|
|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.
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|Like Discuss Correct / Improve Security String pool string immutable immutability expert   rare|
|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 ?|