用Java练习打印三角形和菱形 部分

package com.pei;

public class PrintTriangle {

??? private static final int n = 7;????????????????????? //图形总行数
??? private static final int tmpUp = n / 2 + 1;? //打印菱形中的上行的三角形行数
??? private static final int tmpDn = n / 2;??????? //下行倒三角行数

??? public static void main(String[] args) {
??? ??? prin();

??? ??? prinUp();
??? ??? prinDn();

??? }

??? private static void prin() {
??? ??? // TODO print
??? ??? for (int i = 0; i < n; i++) {
??? ??? ??? for (int j = n - i - 1; j > 0; j--) {
??? ??? ??? ??? System.out.print(" ");
??? ??? ??? }
??? ??? ??? for (int k = 0; k < 2 * i + 1; k++) {
??? ??? ??? ??? System.out.print("*");
??? ??? ??? }
??? ??? ??? System.out.println("");
??? ??? }
??? }

??? //打印菱形中的上行的三角形
??? private static void prinUp() {
??? ??? for (int i = 0; i < tmpUp; i++) {
??? ??? ??? for (int j = tmpUp - i - 1; j > 0; j--) {
??? ??? ??? ??? System.out.print(" ");
??? ??? ??? }
??? ??? ??? for (int k = 0; k < 2 * i + 1; k++) {
??? ??? ??? ??? System.out.print("*");
??? ??? ??? }
??? ??? ??? System.out.println("");
??? ??? }
??? }

?

??? //打印菱形中的下行的三角形
??? private static void prinDn() {
??? ??? for (int i = tmpDn; i > 0; i--) {
??? ??? ??? for (int j = 0; j < tmpUp - i; j++) {
??? ??? ??? ??? System.out.print(" ");
??? ??? ??? }
??? ??? ??? for (int k = 2 * i - 1; k > 0; k--) {
??? ??? ??? ??? System.out.print("*");
??? ??? ??? }
??? ??? ??? System.out.println("");
??? ??? }
??? }

}

?

?

效果:

??? ?? ?? *
?? ? ?? ***
? ? ?? *****
? ?? *******
??? *********
? ***********
*************
? ? ? *
? ? ***
? *****
*******
? *****
? ? ***
? ? ? *