Java Reference
In-Depth Information
56. Finish every set of statements associated with a
case
label with a
break
statement
A
switch
block comprises several
case
labels and an optional but highly recommended
default
label. Statements that follow each
case
label must end with a
break
statement,
which is responsible for transferring the control to the end of the
switch
block. When
omitted, the statements in the subsequent
case
label are executed. Because the
break
statement is optional, omitting it produces no compiler warnings. When this behavior is
unintentional, it can cause unexpected control flow.
Noncompliant Code Example
Inthisnoncompliantcodeexample,thecasewherethe
card
is11lacksa
break
statement.
As a result, execution continues with the statements for
card = 12
.
int card = 11;
switch (card) {
/* ... */
case 11:
System.out.println("Jack");
case 12:
System.out.println("Queen");
break;
case 13:
System.out.println("King");
break;
default:
System.out.println("Invalid Card");
break;
}
Compliant Solution
This compliant solution terminates each case with a
break
statement.
int card = 11;
switch (card) {
