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PMD is a tool that looks for potential problems like possible bugs, dead code, suboptimal code, overcomplicated expressions or duplicate code.

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Avoid jumbled loop incrementers - it's usually a mistake, and it's confusing even if it's what's intended.
    
Example :
    public class JumbledIncrementerRule1 {
  public void foo() {
   for (int i = 0; i < 10; i++) {
    for (int k = 0; k < 20; i++) {
     System.out.println("Hello");
    }
   }
  }
}


This rule is deprecated, use {rule:squid:ForLoopCounterChangedCheck} instead.