Java practice ： Print various drawings （ an isosceles triangle , right triangle , Solid diamond , Hollow diamond ）

1. an isosceles triangle

Code ：

Print screenshots ：

2. right triangle

Code ：

Print screenshots ：

3. Solid diamond

analysis ： Here we can see the diamond as two isosceles triangles , It can be disassembled to print an upright triangle , An inverted triangle . Because there can only be one diagonal in the middle , So either the number of rows of upright triangle stars is one row less than the number of rows of inverted triangle stars , Or the number of rows of inverted triangle stars is one row less than that of upright triangle stars .

Code ：

Print screenshots ：

 4. Hollow diamond

analysis ： It's similar to a solid diamond , Let it show only the stars on four sides , The middle part doesn't let him show , You can judge whether it is equal to the initial value or the end value , If equal to these two values , Responsible for its output "*", If not, output spaces .

Code ：

Print screenshots ：