resources.report.rules.pmd.AvoidArrayLoops.html Maven / Gradle / Ivy

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AvoidArrayLoops


AvoidArrayLoops
Instead of copying data between two arrays, use
    System.arraycopy method
      
		
		
		    
    			This rule is defined by the following XPath expression:
    			
    			
        
//Statement[(ForStatement or WhileStatement) and
count(*//AssignmentOperator[@Image = '='])=1
and
*/Statement
[
./Block/BlockStatement/Statement/StatementExpression/PrimaryExpression
/PrimaryPrefix/Name/../../PrimarySuffix/Expression
[(PrimaryExpression or AdditiveExpression) and count
(.//PrimaryPrefix/Name)=1]//PrimaryPrefix/Name/@Image
and
./Block/BlockStatement/Statement/StatementExpression/Expression/PrimaryExpression
/PrimaryPrefix/Name/../../PrimarySuffix[count
(..//PrimarySuffix)=1]/Expression[(PrimaryExpression
or AdditiveExpression) and count(.//PrimaryPrefix/Name)=1]
//PrimaryPrefix/Name/@Image
]]
    
        
  
		    
		    
	    
	    
        
        
        Example:
            
                    
    
public class Test {
 public void bar() {
  int[] a = new int[10];
  int[] b = new int[10];
  for (int i=0;i<10;i++) {
   b[i]=a[i];
  }
 }
}
            // this will trigger the rule
            for (int i=0;i<10;i++) {
             b[i]=a[c[i]];
            }

        }
    }