Java打印圣诞树

「爱情、让人受尽委屈。」 2022-06-08 00:23 326阅读 0赞

经典java基础循环操作题，圣诞树的打印。先展示下效果吧！

*  
           *** 
          *****
         *     *   
        ***   ***  
       ***** ***** 
      *     *     *  
     ***   ***   *** 
    ***** ***** *****
    //第一步、先循环打印出的格式 
    *
    * * 
    * * *
            for (int i = 1; i <= 3; i++) {
                for (int j = 1; j <= i; j++) {
                    System.out.print("*");
                    System.out.print(" ");
                }
                System.out.println();
            }
    // 第二步、然后循环打印五遍'*'符号
    *****
    ***** ***** 
    ***** ***** *****
            for (int i = 1; i <= 3; i++) {
                for (int j = 1; j <= i; j++) {
                    for(int k=1;k<=5;k++){
                        System.out.print("*");
                    }
                        System.out.print(" ");
                }
                System.out.println();
            }
    //第三步、使用空格布局
          *****
       ***** ***** 
    ***** ***** *****
    
    //1.6 3*2=>3*(3-1) 3*(3-i)
    //2.3 3*1=>3*(3-2)
    //3.0 3*0=>3*(3-3)
            for (int i = 1; i <= 3; i++) {
                for(int j=1;j<=3*(3-i);j++){
                    System.out.print(" ");
                }
                for (int j = 1; j <= i; j++) {
                    for(int k=1;k<=5;k++){
                        System.out.print("*");
                    }
                    System.out.print(" ");
                }
                System.out.println();
            }
    //第四步、循环次数
          *****
          *****
          *****
       ***** ***** 
       ***** ***** 
       ***** ***** 
    ***** ***** *****
    ***** ***** *****
    ***** ***** *****
            for (int i = 1; i <= 3; i++) {
                for (int m = 1; m <= 3; m++) {
                    for (int j = 1; j <= 3 * (3 - i); j++){
                        System.out.print(" ");
                    }
                    for (int j = 1; j <= i; j++) {
                        for (int k = 1; k <= 5; k++){
                            System.out.print("*");
                        }
                        System.out.print(" ");
                    }
                    System.out.println();
                }
            }
    //第五步(最后)、设置星号和空格
    //空格
    1.2  3-m
    2.1
    3.0
    
    //星号
    1.1   2*m-1
    2.3
    3.5
    
    
            for (int i = 1; i <= 3; i++) {
                for (int m = 1; m <= 3; m++) {
                    for (int j = 1; j <= 3 * (3 - i); j++){
                        System.out.print(" ");
                    }
                    for (int j = 1; j <= i; j++) {
                        for (int k = 1; k <= 3-m; k++){
                            System.out.print(" ");
                        }
                        for (int k = 1; k <= 2*m-1; k++){
                            System.out.print("*");
                        }
                        for (int k = 1; k <= 3-m; k++){
                            System.out.print(" ");
                        }
                        System.out.print(" ");
                    }
                    System.out.println();
                }
            }

总结：for循环的嵌套使用