Java代碼輸出菱形的方法和思路有很多，在此分享一個稍帶模塊化拆分思想的解決方案，將需要輸出的菱形拆分成8個模塊（如下圖），每個模塊獨立實現輸出。

優點：8個模塊之間耦合性降低，靈活性增強。也就是說我們可以獨立的控制這8個模塊中任意一個模塊的輸出內容來靈活應對業務邏輯的變更。

按照上圖標好的順序依次實現這8個模塊的代碼，當1458模塊輸出為空格時，其中2367模塊的組合，就是一個菱形。

思路分析：

1 ######*###### 第一排 模塊1[6個'#']+模塊2[1個'*']+模塊3[0個'*']+模塊4[6個'#']2 #####***#####3 ####*****####4 ###*******###5 ##*********##6 #***********# --------------------------------------------------------7 ##*********## 第七排 模塊5[2個'#']+模塊6[5個'*']+模塊7[4個'*']+模塊8[2個'#']8 ###*******###9 ####*****#### 10 #####***##### 11 ######*######

代碼示例：

public class Demo { public static void main(String[] args) { //為了輸出效果在輸出時將思路分析中的'#'替換為' '空格輸出 for (int i = 1; i <= 11; i++) { if (i <= 6) { //當i <=6時打印上三角形 //模塊 1 for (int j = 6; j >= i; j--) { System.out.print(' '); } //模塊 2 for (int j = 0; j < i; j++) { System.out.print('*'); } //模塊 3[同一排中模塊3的'*'個數總比模塊2少1個，所以這里j <i-1作為循環條件即可] for (int j = 0; j < i - 1; j++) { System.out.print('*'); } //模塊 4 for (int j = 6; j >= i; j--) { System.out.print(' '); } //換行 System.out.println(); } else { //當i >6時打印下三角形 //模塊 5 for (int j = 7; j <= i + 1; j++) { System.out.print(' '); } //模塊 6 for (int j = 11; j >= i; j--) { System.out.print('*'); } //模塊 7 for (int j = 11; j >= i + 1; j--) { System.out.print('*'); } //模塊 8 for (int j = 7; j <= i + 1; j++) { System.out.print(' '); } //換行 System.out.println(); } } }}

運行結果：

F:softwareJavajdk1.8.0_121binjava.exe '-javaagent:D:IntelliJ IDEA 2019.1.4libidea_rt.jar=50753:D:IntelliJ IDEA 2019.1.4bin' -Dfile.encoding=UTF-8 -classpath F:softwareJavajdk1.8.0_121jrelibcharsets.jar;F:softwareJavajdk1.8.0_121jrelibdeploy.jar;F:softwareJavajdk1.8.0_121jrelibextaccess-bridge-64.jar;F:softwareJavajdk1.8.0_121jrelibextcldrdata.jar;F:softwareJavajdk1.8.0_121jrelibextdnsns.jar;F:softwareJavajdk1.8.0_121jrelibextjaccess.jar;F:softwareJavajdk1.8.0_121jrelibextjfxrt.jar;F:softwareJavajdk1.8.0_121jrelibextlocaledata.jar;F:softwareJavajdk1.8.0_121jrelibextnashorn.jar;F:softwareJavajdk1.8.0_121jrelibextsunec.jar;F:softwareJavajdk1.8.0_121jrelibextsunjce_provider.jar;F:softwareJavajdk1.8.0_121jrelibextsunmscapi.jar;F:softwareJavajdk1.8.0_121jrelibextsunpkcs11.jar;F:softwareJavajdk1.8.0_121jrelibextzipfs.jar;F:softwareJavajdk1.8.0_121jrelibjavaws.jar;F:softwareJavajdk1.8.0_121jrelibjce.jar;F:softwareJavajdk1.8.0_121jrelibjfr.jar;F:softwareJavajdk1.8.0_121jrelibjfxswt.jar;F:softwareJavajdk1.8.0_121jrelibjsse.jar;F:softwareJavajdk1.8.0_121jrelibmanagement-agent.jar;F:softwareJavajdk1.8.0_121jrelibplugin.jar;F:softwareJavajdk1.8.0_121jrelibresources.jar;F:softwareJavajdk1.8.0_121jrelibrt.jar;D:ideastudyspacespring_studyspring-studyspring-study-aoptargetclasses;E:softwareMavenRepositoryorgaspectjaspectjweaver1.9.4aspectjweaver-1.9.4.jar;E:softwareMavenRepositoryorgspringframeworkspring-webmvc5.2.0.RELEASEspring-webmvc-5.2.0.RELEASE.jar;E:softwareMavenRepositoryorgspringframeworkspring-aop5.2.0.RELEASEspring-aop-5.2.0.RELEASE.jar;E:softwareMavenRepositoryorgspringframeworkspring-beans5.2.0.RELEASEspring-beans-5.2.0.RELEASE.jar;E:softwareMavenRepositoryorgspringframeworkspring-context5.2.0.RELEASEspring-context-5.2.0.RELEASE.jar;E:softwareMavenRepositoryorgspringframeworkspring-core5.2.0.RELEASEspring-core-5.2.0.RELEASE.jar;E:softwareMavenRepositoryorgspringframeworkspring-jcl5.2.0.RELEASEspring-jcl-5.2.0.RELEASE.jar;E:softwareMavenRepositoryorgspringframeworkspring-expression5.2.0.RELEASEspring-expression-5.2.0.RELEASE.jar;E:softwareMavenRepositoryorgspringframeworkspring-web5.2.0.RELEASEspring-web-5.2.0.RELEASE.jar;E:softwareMavenRepositorycomalibabafastjson1.2.47fastjson-1.2.47.jar com.shiguang.test.Demo * *** ***** ******* ********* *********** ********* ******* ***** *** *

Process finished with exit code 0

此時只需要將1458模塊輸出為'*'，2367模塊輸出為空格即可得到一個空心菱形。

代碼示例：

public class Demo2 { public static void main(String[] args) { for (int i = 1; i <= 11; i++) { if (i <= 6) { //當i <=6時打印上三角形 //模塊 1 for (int j = 6; j >= i; j--) { System.out.print('*'); } //模塊 2 for (int j = 0; j < i; j++) { System.out.print(' '); } //模塊 3[同一排中模塊3的'*'個數總比模塊2少1個，所以這里j <i-1作為循環條件即可] for (int j = 0; j < i - 1; j++) { System.out.print(' '); } //模塊 4 for (int j = 6; j >= i; j--) { System.out.print('*'); } //換行 System.out.println(); } else { //當i >6時打印下三角形 //模塊 5 for (int j = 7; j <= i + 1; j++) { System.out.print('*'); } //模塊 6 for (int j = 11; j >= i; j--) { System.out.print(' '); } //模塊 7 for (int j = 11; j >= i + 1; j--) { System.out.print(' '); } //模塊 8 for (int j = 7; j <= i + 1; j++) { System.out.print('*'); } //換行 System.out.println(); } } }}

運行結果：

F:softwareJavajdk1.8.0_121binjava.exe '-javaagent:D:IntelliJ IDEA 2019.1.4libidea_rt.jar=50681:D:IntelliJ IDEA 2019.1.4bin' -Dfile.encoding=UTF-8 -classpath F:softwareJavajdk1.8.0_121jrelibcharsets.jar;F:softwareJavajdk1.8.0_121jrelibdeploy.jar;F:softwareJavajdk1.8.0_121jrelibextaccess-bridge-64.jar;F:softwareJavajdk1.8.0_121jrelibextcldrdata.jar;F:softwareJavajdk1.8.0_121jrelibextdnsns.jar;F:softwareJavajdk1.8.0_121jrelibextjaccess.jar;F:softwareJavajdk1.8.0_121jrelibextjfxrt.jar;F:softwareJavajdk1.8.0_121jrelibextlocaledata.jar;F:softwareJavajdk1.8.0_121jrelibextnashorn.jar;F:softwareJavajdk1.8.0_121jrelibextsunec.jar;F:softwareJavajdk1.8.0_121jrelibextsunjce_provider.jar;F:softwareJavajdk1.8.0_121jrelibextsunmscapi.jar;F:softwareJavajdk1.8.0_121jrelibextsunpkcs11.jar;F:softwareJavajdk1.8.0_121jrelibextzipfs.jar;F:softwareJavajdk1.8.0_121jrelibjavaws.jar;F:softwareJavajdk1.8.0_121jrelibjce.jar;F:softwareJavajdk1.8.0_121jrelibjfr.jar;F:softwareJavajdk1.8.0_121jrelibjfxswt.jar;F:softwareJavajdk1.8.0_121jrelibjsse.jar;F:softwareJavajdk1.8.0_121jrelibmanagement-agent.jar;F:softwareJavajdk1.8.0_121jrelibplugin.jar;F:softwareJavajdk1.8.0_121jrelibresources.jar;F:softwareJavajdk1.8.0_121jrelibrt.jar;D:ideastudyspacespring_studyspring-studyspring-study-aoptargetclasses;E:softwareMavenRepositoryorgaspectjaspectjweaver1.9.4aspectjweaver-1.9.4.jar;E:softwareMavenRepositoryorgspringframeworkspring-webmvc5.2.0.RELEASEspring-webmvc-5.2.0.RELEASE.jar;E:softwareMavenRepositoryorgspringframeworkspring-aop5.2.0.RELEASEspring-aop-5.2.0.RELEASE.jar;E:softwareMavenRepositoryorgspringframeworkspring-beans5.2.0.RELEASEspring-beans-5.2.0.RELEASE.jar;E:softwareMavenRepositoryorgspringframeworkspring-context5.2.0.RELEASEspring-context-5.2.0.RELEASE.jar;E:softwareMavenRepositoryorgspringframeworkspring-core5.2.0.RELEASEspring-core-5.2.0.RELEASE.jar;E:softwareMavenRepositoryorgspringframeworkspring-jcl5.2.0.RELEASEspring-jcl-5.2.0.RELEASE.jar;E:softwareMavenRepositoryorgspringframeworkspring-expression5.2.0.RELEASEspring-expression-5.2.0.RELEASE.jar;E:softwareMavenRepositoryorgspringframeworkspring-web5.2.0.RELEASEspring-web-5.2.0.RELEASE.jar;E:softwareMavenRepositorycomalibabafastjson1.2.47fastjson-1.2.47.jar com.shiguang.test.Demo****** *********** ********* ******* ***** *** *** ***** ******* ********* *********** ******

Process finished with exit code 0

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