PMD可扫描Java源代码，查找潜在问题，如空的try/catch/finally/switch块、未使用的局部变量、参数和私有方法、空的if/while语句、过于复杂的表达式、高圈复杂度的类等，并给出了相关参考链接。
http://pmd.sourceforge.net/
PMD scans Java source code and looks for potential problems like:
- Empty try/catch/finally/switch blocks
- Unused local variables, parameters and private methods
- Empty if/while statements
- Overcomplicated expressions - unnecessary if statements, for loops that could be while loops
- Classes with high Cyclomatic Complexity measurements
http://www-900.ibm.com/developerworks/cn/java/j-pmd/index.shtml
http://www.onjava.com/pub/a/onjava/2003/02/12/static_analysis.html
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