Miscellany

public class ForTest
{

    enum Letter { A, B, C, D };


    public static void main ( String[] args )
    {
        // Part 1.
        //
        for ( int a=0, b=10 ; a<b ; a++,b--) System.out.println("a="+a+", b="+b);

        // Part 2.
        //
        int x;
        Integer y;
        for ( x=0, y=10; x<y ; x++,y--) System.out.println("x="+x+", y="+y);
//      for ( x=0, y=10; x<y ; x++,y--) System.out.println("x="+x+", y="+y);

        // Part 3.
        //
        for ( Letter l : Letter.values() ) System.out.println("l="+l);

    }

}