Local.java

// Local.java:  common programming mistakes

/*
   Localize scope of variables; use declarations in for loops.
   Declare and initialize variables at the same time.
   Use "final" for single-assigment variables.
   Don't test, return, set, etc boolean constants.
   Use horizontal and vertical space wisely.
*/

class Local  {

   public static void main (String args[])  {

      /*** The long way to do it.  ***/
      boolean b1;
      int temp1;     // a temporary variable
      int i1;        // a for-loop index
      int j1, k1;
      j1=5;
      k1=6;
      if (j1==k1) {
	 b1 = true;
      } else {
	 b1 = false;
      }
      for (i1=0; i1<78; i1++) {
	 if (b1==true) {
	    temp1 = j1;
	    j1 = k1;
	    k1 = temp1;
	 }
      }

      /*** A better way to do it.  ***/
      int j2=5, k2=6;
      final boolean b2 = (j2==k2);
      for (int i2=0; i2<78; i2++) {
	 if (b2) {
	    final int temp2=j2; j2=k2; k2=temp2;
	 }
      }

   }
}