JeffGriggOneLoop

public class JeffGriggOneLoop {
    public static void main(final String[] args) {
        printLinesWithValuesUpTo(7);
    }

    public static void printLinesWithValuesUpTo(final int largestValue) {
        int largestInThisLine = 1;
        int printValue = 1;
        int increment = 1;
        while (largestInThisLine <= largestValue) {
            System.out.print(printValue + " ");
            if (printValue == largestInThisLine) {  // When you hit the top value, ...
                increment = -1;                     //  count down (to the end of the line).
            }
            printValue += increment;
            if (printValue == 0) {      // At the end of each line...
                System.out.println();   //  Go to the next line.
                printValue = 1;         //  Start again at one.
                increment = 1;          //  Count up from there.
                ++largestInThisLine;    //  The next line goes up to a value that's one larger.
            }
        }
    }
}