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package class07;
public class Code08_PaperFolding {
public static void printAllFolds(int N) {
printProcess(1, N, true);
}
// 递归过程，来到了某一个节点，
// i是节点的层数，N一共的层数，down == true 凹 down == false 凸
public static void printProcess(int i, int N, boolean down) {
if (i > N) {
return;
printProcess(i + 1, N, true);
System.out.println(down ? "凹 " : "凸 ");
printProcess(i + 1, N, false);
public static void main(String[] args) {
int N = 3;
printAllFolds(N);
