dhanashree mangaonkar

Now String str1="hi"
String str2="hi"
Both str1 and str2 denote same object
If i change str2="hello" then will str1 also point to "hello"?

String str="hi"
str = str + "hello"
or
str=str.concat("hello")
Will result into str="hi hello"
now strings r immutable then why it's content gets changed?