java打印菱形方法：
package?circulationDemo;?
import?java.util.Scanner;?
public?class?Test?{?
public?static?void?main(String[]?args)?{?
Scanner?input?=?new?Scanner(System.in);?
System.out.println("請輸入要打印的行數：");?
int?num?=?input.nextInt();?
t1(num);//?正直角?
split();?
t2(num);//?倒直角?
split();?
t3(num);//?等腰三角?
split();?
t4(num);//?等腰倒三角++?
split();?
t5(num);//?等腰倒三角--?
split();?
t6(num);//?實心菱形?
split();?
t7(num);//?空心菱形(1)?
split();?
t8(num);//?空心菱形(2)?
split();?
t9(num);//?空心菱形(3)?
}?
private?static?void?t9(int?num)?{?
for?(int?k?=?1;?k?<=?num;?k++)?{?
for?(int?i?=?1;?i?<=?(num?-?k);?i++)?{?
System.out.print("?");?
}?
System.out.print("*");?
for?(int?i?=?1;?i?<=?((k?-?2)?*?2?+?1);?i++)?{?
System.out.print("?");?
}?
if?(k?!=?1)?{?
System.out.print("*");?
}?
System.out.println();?
}?
for?(int?k?=?num-1;?k?>=?1;?k--)?{?
for?(int?i?=?1;?i?<=?(num?-?k);?i++)?{?
System.out.print("?");?
}?
System.out.print("*");?
for?(int?i?=?1;?i?<=?((k?-?2)?*?2?+?1);?i++)?{?
System.out.print("?");?
}?
if?(k?!=?1)?{?
System.out.print("*");?
}?
System.out.println();?
}?
}?
private?static?void?t8(int?num)?{?
//?上半部分?
for?(int?i?=?1;?i?<=?num;?i++)?{?
//?打印上半部分空格?
for?(int?j?=?1;?j?<=?num?-?i;?j++)?{?
System.out.print("?");?
}?
//?打印原本實心的*部分?
for?(int?j?=?1;?j?<=?2?*?i?-?1;?j++)?{?
//?僅在壹行的開頭和末尾打印*?
if?(j?==?1?||?j?==?2?*?i?-?1)?{?
System.out.print("*");?
}?else?{?
System.out.print("?");?
}?
}?
System.out.println();?
}?
//?下半部分?
for?(int?i?=?1;?i?<=?num?-?1;?i++)?{?
for?(int?j?=?1;?j?<=?i;?j++)?{?
System.out.print("?");?
}?
for?(int?j?=?1;?j?<=?2?*?(num?-?i?-?1)?+?1;?j++)?{?
if?(j?==?1?||?j?==?2?*?(num?-?i?-?1)?+?1)?{?
System.out.print("*");?
}?else?{?
System.out.print("?");?
}?
}?
System.out.println();?
}?
}?
private?static?void?t7(int?num)?{?
//?打印上半部分?
for?(int?i?=?1;?i?<=?num;?i++)?{?
//?打印空格?
for?(int?j?=?1;?j?<=?(num?-?i);?j++)?{?
System.out.print("?");?
}?
//?打印*的個數?
if?(i?==?1)?{?
System.out.print("*");?
}?else?{?
System.out.print("*");?
//?打印菱形裏的空格?
for?(int?j?=?1;?j?<=?(2?*?i?-?3);?j++)?{?
System.out.print("?");?
}?
System.out.print("*");?
}?
System.out.println();?
}?
//?打印下半部分?
for?(int?i?=?num?-?1;?i?>?0;?i--)?{?
//?打印空格?
for?(int?j?=?1;?j?<=?(num?-?i);?j++)?{?
System.out.print("?");?
}?
//?打印*的個數?
if?(i?==?1)?{?
System.out.print("*");?
}?else?{?
System.out.print("*");?
//?打印菱形裏的空格?
for?(int?j?=?1;?j?<=?(2?*?i?-?3);?j++)?{?
System.out.print("?");?
}?
System.out.print("*");?
}?
System.out.println();?
}?
}?
private?static?void?t6(int?num)?{?
//?上半部分?
for?(int?i?=?1;?i?<=?num;?i++)?{?
for?(int?j?=?1;?j?<=?num?-?i;?j++)?{?
System.out.print("?");?
}?
for?(int?j?=?1;?j?<=?2?*?i?-?1;?j++)?{?
System.out.print("*");?
}?
System.out.println();?
}?
//?下半部分?
for?(int?i?=?1;?i?<=?num?-?1;?i++)?{?
for?(int?j?=?1;?j?<=?i;?j++)?{?
System.out.print("?");?
}?
for?(int?j?=?1;?j?<=?2?*?(num?-?1?-?i)?+?1;?j++)?{?
System.out.print("*");?
}?
System.out.println();?
}?
}?
private?static?void?t5(int?num)?{?
for?(int?i?=?num;?i?>?0;?i--)?{?
for?(int?j?=?1;?j?<=?num?-?i;?j++)?{?
System.out.print("?");?
}?
for?(int?j?=?1;?j?<=?2?*?i?-?1;?j++)?{?
System.out.print("*");?
}?
System.out.println();?
}?