Java control structures - Objects First with Java: A Practical Introduction Using BlueJ - page 512

of the first values will execute the first statements section, whereas values four and five will
execute the second statements section.
■ The default case is optional. If no default is given, it may happen that no case is
executed.
■ The break statement after the default (or the last case, if there is no default) is not needed
but is considered good style.
■ From Java 7, the expression used to switch on and the case labels may be strings.

Examples:

switch (day) {
case 1: dayString = "Monday" ;
break ;
case 2: dayString = "Tuesday" ;
break ;
case 3: dayString = "Wednesday" ;
break ;
case 4: dayString = "Thursday" ;
break ;
case 5: dayString = "Friday" ;
break ;
case 6: dayString = "Saturday" ;
break ;
case 7: dayString = "Sunday" ;
break ;
default : dayString = "invalid day" ;
break ;

}

switch (dow.toLowerCase()) {
case "mon":
case "tue":
case "wed":
case "thu":
case "fri":
goToWork();
break ;
case "sat":
case "sun":
stayInBed();
break ;

}

D.3 Loops

Java has three loops: while , do-while , and for . The for loop has two forms. Both while and do-
while are well suited for indefinite iteration. The for-each loop is intended for definite iteration
over a collection, and the for loop falls somewhere between the two. Except for the for-each
loop, repetition is controlled in each with a boolean expression.