Rule Definition
String concatenation resolved at runtime is much slower than using StringBuffer.
Remediation
Use StringBuffer and StringBuffer.append() method instead
Violation Code Sample
String result = "hello";
result += " John";
result += " Smith"; // VIOLATION if the threshold is 3
Fixed Code Sample
StringBuffer result = new StringBuffer("hello");
result.append(" John");
result.append(" Smith");
Reference
http://www.precisejava.com/javaperf/j2se/StringAndStringBuffer.htm#Strings104
Related Technologies
JEE
Technical Criterion
CWE-1046 - Creation of Immutable Text Using String Concatenation
About CAST Appmarq
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