在Java中创建数字模式（续） [英] creating number patterns in java(continued)

问题描述

我需要根据用户输入的行数在Java中创建这些模式：

I need to create these patterns in java according to however many lines the user enters:

1

12

123

1234

12345

1
12
123
1234
12345

54321

4321

321

21

1

54321
4321
321
21
1

12345

1234

123

12

1

12345
1234
123
12
1

我可以做前两个，但不能做第三个。每个数字之间也需要一个空格。

I can do the first two but I cannot do the third. I also need a space between each number. Please help!

这是我第一次使用的代码：

Here is the code I used for the first:

public static void displayPatternI（整数行）{

public static void displayPatternI (int lines) {

    for (int i = 1; i <= lines; i++){
        for (int j = 1; j <= i; j++)
            System.out.print (j + " " );
        System.out.println();
    }
}

编辑：
这是代码第二种模式：

this is the code for the second pattern:

for（int i = 1; i <= lines; i ++）{
for（int j = lines + 1-i; j> 0; j--）
System.out.print（j +）;
System.out.println（）;

for (int i = 1; i <= lines; i++){ for (int j = lines + 1 - i; j > 0; j--) System.out.print (j + " "); System.out.println();

我尝试了广泛修改第一个代码，但是我无法获得第三个模式...

I have tried modifying the first code extensively but I cannot get the third pattern...

推荐答案

只需将您的第一个for循环更改为减量而不是增量

Simply change your first for loop to decrement instead of increment

for (int i = lines; i > 0; i--) {

而不是

for (int i = 1; i <= lines; i++){

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