用双重for循环打出来的图形

 

import java.util.Scanner;

public class Test02 {

public static void main(String[] args) {

Scanner input=new Scanner(System.in);

System.out.println("请输入要打印的行数");

int rows=input.nextInt();

System.out.println("矩形");

for (int i = 1; i <=rows; i++) {

for (int j = 1; j <= rows; j++) {

System.out.print("*");

}

System.out.println();

}

System.out.println("直角三角型");

for (int i = 1; i <= rows; i++) {

for (int j = 1; j <= i; j++) {

System.out.print("*");

}

System.out.println();

}

System.out.println("等腰三角型");

for (int i = 1; i <= rows; i++) {

for (int j =rows-i-1; j >=0; j--) {

System.out.print(" ");

}

for (int j = 1; j <= 2*i-1; j++) {

System.out.print("*");

}

System.out.println();

}

System.out.println("菱形");

for (int i = 1; i <= rows; i++) {

for (int j =rows-i-1; j >=0; j--) {

System.out.print(" ");

}

for (int j = 1; j <= 2*i-1; j++) {

System.out.print("*");

}

System.out.println();

}

for (int i = 1; i <= rows-1; i++) {

for (int j = 1; j <=i; j++) {

System.out.print(" ");

}

for(int j=1;j<=2*(rows-i)-1;j++){

System.out.print("*");

}

System.out.println();

}

}

}

程序运行图

请输入要打印的行数

5

矩形

*****

*****

*****

*****

*****

直角三角型

*

**

***

****

*****

等腰三角型

      *

    ***

   *****

 *******

*********

菱形

       *

     ***

   *****

 *******

*********

 *******

   *****

    ***

      *