用java打印正三角形和倒三角形

源代码：

//打印正三角形
public class RegularTriangle {
    public static void main(String[] args) {
        System.out.println("打印正三角形和倒三角形");
        for (int i = 0; i <=5; i++) {
            for (int j = 5; j >=i ; j--) {
                System.out.print(" ");
            }
            for (int j = 1; j <=i; j++) {
                System.out.print("*");
            }
            for (int j = 1; j <i; j++) {
                System.out.print("*");
            }
            System.out.println();//输出一个换行
        }
        System.out.println("===========");
        for (int i = 1; i <=5; i++) {
            for (int j = 1; j <=i ; j++) {
                System.out.print(" ");
            }
            for (int j = 5; j>=i; j--) {
                System.out.print("*");
            }
            for (int j = 5; j>i ; j--) {
                System.out.print("*");
            }
            System.out.println();//输出一个换行
        }
    }
}

运行结果：

打印正三角形和倒三角形
      
     *
    ***
   *****
  *******
 *********
===========
 *********
  *******
   *****
    ***
     *

Process finished with exit code 0