INTERVIEW QUESTIONS J2EE JAVA DETAILS

Question: Why Strings in Java are called as Immutable?

Answer: string objects are called immutable as once value has been assigned to a string, it can’t be changed and if changed, a new object is created.

In below example, reference str refers to a string object having value “Value one”.


String str="Value One";
1
String str="Value One";


When a new value is assigned to it, a new String object gets created and the reference is moved to the new object.


str="New Value";
1
str="New Value";

string objects are called immutable as once value has been assigned to a string, it can’t be changed and if changed, a new object is created.

In below example, reference str refers to a string object having value “Value one”.


String str="Value One";
1
String str="Value One";


When a new value is assigned to it, a new String object gets created and the reference is moved to the new object.


str="New Value";
1
str="New Value";
Source: CoolInterview.com

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