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-m
2.1
3.0//星号
1.1   2*m-1
2.3
3.5for (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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