Strings and Object References in Java

The String class is used for text manipulation. As you read, you will learn different ways to create Strings, methods to manipulate Strings, the String concatenation operator '+', and about how Strings are immutable.

11. + Operator



Answer:
Yes: in output statements like this:
System.out.println( "Result is:" + result );
The + operator is a short way of asking for concatenation. (If result is a number, 
 it is first converted into characters before the concatenation is done.)


+ Operator


stringConcat








Here the + operator is used instead of using the concat() method:



    
String first = "Red " ;
String last  = "Rose" ;
String name  = first + last ;




String concatenation, done by concat() or by +, always constructs a new object based on data in other objects. Those objects are not altered at all.


When the operands on either side of + are numbers, then + means "addition". If one or both of the operands is a String reference, then String concatenation is
    performed. When an operator such as + changes meaning depending on its arguments, it is said to be overloaded.








Question 11:
Say that the following statement is added after the others:
    String reversed = last + first;
Does it change first, last, or name?