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

I would explain it with simple example

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consider any character array : e.g. char a[]={'h','e','l','l','o'}; and a string : String s="hello";

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on character array we can perform operations like printing only last three letters using iterating the array; but in string we have to make new String object and copy required substring and its address will be in new string object.

e.g.

***String s="hello";
String s2=s.substrig(0,3);***

so s2 will have "hel";