java打印菱形

菱形分上下两个部分。其中上部分同打印金字塔；下部分循环部分i是递减
（ps:菱形层数只能为奇数）

import java.util.Scanner;public class Lingxing{public static void main(String[] args) {Scanner myScanner = new Scanner(System.in);System.out.print("please input lingxing layers(odd number):");int layers = myScanner.nextInt();int mid = layers / 2 + 1;//层数的一半，向上取整，eg.layers = 5,mid = 3//打印上半部分（即金字塔）for(int i = 1; i <= mid; i ++){//上半部分循环次数for(int j = 1; j <= mid - i; j ++){System.out.print(" ");}for(int k = 1; k <= 2 * i - 1; k ++){System.out.print("*");}System.out.println();}//打印下半部分for(int i = layers; i >= mid; i --){//下半部分循环次数//如果i++的话，星号数和layers和i没有关系for(int j = 1; j <= layers - i + 1; j ++){//打印空格数System.out.print(" ");}for(int k = 1; k <= 2 * (i - mid) - 1; k ++){//打印*数System.out.print("*");}System.out.println();}}
}

打印结果截图如下：

java打印空心菱形

菱形分上下两个部分。其中上部分同打印空心金字塔；
下半部分同打印星号同空心菱形
（ps:菱形层数只能为奇数）

import java.util.Scanner;public class KongxinLingxing{public static void main(String[] args) {Scanner myScanner = new Scanner(System.in);System.out.print("please input KongxinLingxing layers(odd number):");int layers = myScanner.nextInt();int mid = layers / 2 + 1;//层数的一半，向上取整，eg.layers = 5,mid = 3//打印上半部分（即空心金字塔）for(int i = 1; i <= mid; i ++){//first layers-1 rowsfor(int j = 1; j <= mid - i; j ++){//space numberSystem.out.print(" ");}for(int k = 1; k <= 2 * i - 1; k ++){if(k == 1 || k == 2 * i - 1)System.out.print("*");elseSystem.out.print(" ");}System.out.println();}//打印下半部分for(int i = layers; i >= mid; i --){//如果i++的话，星号数和layers和i没有关系for(int j = 1; j <= layers - i + 1; j ++){System.out.print(" ");}for(int k = 1; k <= 2 * (i - mid) - 1; k ++){if(k == 1 || k == 2 * (i - mid) - 1)//打印第一个*和最后一个*System.out.print("*");elseSystem.out.print(" ");}System.out.println();}}
}