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UseStringBufferForStringAppends

UseStringBufferForStringAppends

The use of the ‘+=’ operator for appending strings causes the JVM to create and use an internal StringBuffer. If a non-trivial number of these concatenations are being used then the explicit use of a StringBuilder or threadsafe StringBuffer is recommended to avoid this.
This rule is defined by the following Java class: net.sourceforge.pmd.lang.java.rule.optimizations.UseStringBufferForStringAppendsRule
Example(s):


      
public class Foo {
  void bar() {
    String a;
    a = "foo";
    a += " bar";
   // better would be:
   // StringBuilder a = new StringBuilder("foo");
   // a.append(" bar);
  }
}