Use 'equals' Instead of '==' (UE)

Description:

UE detects if string operands are compared by == or != operator. As far as == returns true only if operands point to the same object, so it can return false for two strings with same contents.

Example:

The following function will always return false in JDK1.1.5:

   public boolean cmp(int i, int j) {
       // warning message will be produced
       return Integer.toString(i) == Integer.toString(j);
   }