Draw some pattern for fun

pattern1.java

public class pattern1 {
    public static void main(String[] args) {
        int n = Integer.parseInt(args[0]);
        if(n == 1) System.out.println("x "); else
        printPattern(n);
    }
    private static void printPattern(int n) {
        boolean genap = (n%2 == 0) ? true : false;
        String basePattern = "";
        for (int i=0; i<(genap ? (n/2) : (n/2+1)); i++) {
            basePattern += (i%2 == 0) ? "x " : "o ";
        }
        int length = basePattern.length();
        /* Pattern Top */
        for (int i=0; i<n-1; i++) {
            for (int j=0; j<n-1; j++) {
                System.out.print(" ");
            }
            for (int j=0+length-i-1; j<length; j++) {
                System.out.print(basePattern.charAt(length-j-1));
            }
            System.out.println("");
        }
        /* Pattern Mid */
        System.out.print(basePattern.trim());
        for (int i=(genap ? 0 : 2); i<length; i++) {
            System.out.print(basePattern.charAt(length-i-1));
        }
        System.out.println();
        /* Pattern Bot */
        for (int i=0; i<n-1; i++) {
            for (int j=0; j<i+1; j++) {
                System.out.print(" ");
            }
            System.out.println(basePattern.substring(0,length-1-i-(n%2)));
        }
    }
}