Can someone help me pls??

[jow620]

Can someone explane me why you get as result of this process: true, true, false, true?

public class PaliMod {
	private int delta;
	public PaliMod(int mnD) {
		delta = mnD;
	}
	private boolean check(int [] rij,int d) {
		if (d >= rij.length - d - 1) return true;
		if ((rij[d]- rij[rij.length-d-1]) % delta == 0) 
				return check(rij,d+1);
		return false;
	}
	public boolean check(int [] eenRij) {
		return check(eenRij,0);
	}
	public static void main(String[] args) {
		int [] rij1 = {1,67,13,2,14};
		int [] rij2 = {1};
		int [] rij3 = {1,130};
		PaliMod gen = new PaliMod(13);
		System.out.println(gen.check(rij1));
		System.out.println(gen.check(rij2));
		System.out.println(gen.check(rij3));
		System.out.println(new PaliMod(111).
check(new int[]{1,2,3,4,448,336,224,112}));
	}
}

--------------------Configuration: <Default>--------------------
true
true
false
true

Process completed.

[dragonlinux]

just check the flow. starting from main() ..