Immutability of Strings in Java

Question

Consider the following example.

String str = new String();

str  = \"Hello\";
System.out.println(str);  //Prints Hello

str = \"Help!\";
System.out.println(s         


        

Answer 1

String is immutable. Which means that we can only change the reference.

---

String a = "a";
System.out.println("String a is referencing to "+a); // Output: a

a.concat("b");
System.out.println("String a is referencing to "+a); // Output: a

a = a.concat("b");
System.out.println("String a has created a new reference and is now referencing to "+a); // Output: ab