Java打印圣诞树

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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-m2.13.0//星号1.1   2*m-12.33.5        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
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