The length method:
You can invoke a length method on a String object in order to find out its length. For example, the expression:
name.length()
evaluates to the number of characters in the string referenced by name. If this string were "Roderick", the length method would return the value 8. The empty string has length zero.
String concatenation
Because we often want to print strings on our computer screens, the operator that joins (concatenates) strings is frequently used. This is the concatenation operator, written +.
If either of its arguments is a String, the + operator will automatically turn any arguments into strings before carrying out a concatenation operation.
For example, we can write the following:
int occupants = 2;
String address = "Filby Lane";
String printout;
printout = address + " has " + occupants + " occupants";
The right-hand side of the assignment would convert occupants to a string and then concatenate all the strings to create the single string "Filby Lane has 2 occupants". By assignment, the printout variable would then be made to reference that string object.
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