Nested for loop exercise

/**
 * @author 苗晓强
 * @date 2023/7/25 17:04
 * 嵌套循环
 * 实际开发中，应当将嵌套循环控制在3层以内，再多，应当重新考虑业务需求
 * 以两层循环为例，外层循环控制行，内层循环控制列
 */
public class ForForTest {
    public static void main(String[] args) {

        System.out.println("=============正三角形=========================");
        for (int i = 1; i <= 9; i++){
            for (int j = 1; j <= i; j++){
                System.out.print("*");
            }
            System.out.println();
        }
        System.out.println("=============倒三角形============================");
        for (int i = 1; i <= 9; i++){
            for (int j = 9; j >= i; j--){
                System.out.print("*");
            }
            System.out.println();
        }
        System.out.println("=============菱形============================");
        //菱形上半部分
        for (int i = 1; i <=5; i++){
            for (int j = 1;j <= 10-2*i;j++){
                System.out.print(" ");
            }
            for (int j = 1;j <= 2*i - 1;j++){
                System.out.print("* ");
            }
            System.out.println();
        }
        //菱形下半部分
        for (int i = 1; i <=4; i++){
            for (int j = 1;j <= 2*i;j++){
                System.out.print(" ");
            }
            for (int j = 1;j <= 9 - 2*i;j++){
                System.out.print("* ");
            }
            System.out.println();
        }


        System.out.println("==================九九乘法表================");
        for (int i = 1; i <= 9; i++){
            for (int j = 1; j <= i; j++){
                System.out.print(j + "*" + i + "="  + j*i + "\t");
            }
            System.out.println();
        }
    }
}