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.
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*MSC09-EX0*: The {{break}} statement at the end of the final case in a {{switch}} statement may be omitted. By convention, this is the {{default}} label. The {{break}} statement serves to transfer control to the end of the {{switch}} block. Fall-through behavior also causes control to arrive at the end of the {{switch}} block. Consequently, control transfers to the statements following the {{switch}} block without regard to the presence or absence of the {{break}} statement. Nevertheless, the final case in a {{switch}} statement should end with a {{break}} statement, in accordance with good programming style (see \[java:[Rogue 2000|AA. References#Rogue 00]\]). |
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MSC17-C. Finish every set of statements associated with a case label with a break statement | ||||
MSC18-CPP. Finish every set of statements associated with a case label with a break statement | ||||
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="1e2d75f82c877a65-c8ae0f09-42fa477e-976bab1e-d4f47a4ae5809646135cc03a"><ac:plain-text-body><![CDATA[ | [ISO/IEC TR 24772:2010 | http://www.aitcnet.org/isai/] | "Switch Statements and Static Analysis [java:CLL]" | ]]></ac:plain-text-body></ac:structured-macro> |
CWE-484, "Omitted Break Statement in Switch" |
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<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="f967263d4f750759-b0b313e4-4b6c42e5-86b2822c-9869821b3d4e1bfe7dda364b"><ac:plain-text-body><![CDATA[ | [java:[JLS 2005 | AA. References#JLS 05]] | [Section 14.11 The switch Statement | http://java.sun.com/docs/books/jls/third_edition/html/statements.html#14.11] | ]]></ac:plain-text-body></ac:structured-macro> |
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="2838e086a6cb10fa-b1cd2f0b-4ecf4abb-b0f087f0-1111cb1c785f0aab006386bd"><ac:plain-text-body><![CDATA[ | [java:[Rogue 2000 | AA. References#Rogue 00]] | [The Elements of Java Style | http://www.ambysoft.com/books/elementsJavaStyle.html], Rule 78. | ]]></ac:plain-text-body></ac:structured-macro> |
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49. Miscellaneous (MSC) MSC57-J. Use inequality operators to terminate loops whose counter changes by more than one