String concatenation is so common that Java provides a specific abbreviation for using the method concat(). Specifically, the expression:
can be rewritten as:"xxx".concat("yyy")
"xxx" + "yyy"
Example:
public class JFK { public static void main(String[] args) { String first = "John"; String middle = "Fitzgerald"; String last = "Kennedy"; String initials; String firstInit, middleInit, lastInit; firstInit = first.substring(0,1); middleInit = middle.substring(0,1); lastInit = last.substring(0,1); initials = firstInit + middleInit + lastInit; System.out.println(initials); } } // or simply public class JFK2 { public static void main(String[] args) { String first = "John"; String middle = "Fitzgerald"; String last = "Kennedy"; System.out.println(first.substring(0,1) + middle.substring(0,1) + last.substring(0,1)); } }