提问人：isabel8998 提问时间：6/10/2023 最后编辑：Pshemoisabel8998 更新时间：6/11/2023 访问量：52
嵌套 For 循环方块 - Java
Nested For Loop Square- Java
问：
我是 Java 的新手，我正在使用嵌套的 for 循环制作两个三角形的正方形。它应该看起来像这样：
+ + + + +
* + + + +
* * + + +
* * * + +
* * * * +
到目前为止，我的代码如下所示：
for (int i = 0; i < 5; i++) {
for (int j = 0; j < i; j++) {
System.out.print("* ");
}
System.out.println();
但它给我的只是广场的星形部分。我不知道如何从这里开始。谁能帮忙？
答：
1赞
azro
6/10/2023
#1
添加星星后，您可以添加加号i5-i
int lineLength = 5;
for (int i = 0; i < lineLength; i++) {
for (int j = 0; j < i; j++) {
System.out.print("* ");
}
for (int j = 0; j < lineLength - i; j++) {
System.out.print("+ ");
}
System.out.println();
}
可用于简化代码String.repeat
int lineLength = 5;
for (int i = 0; i < lineLength; i++) {
System.out.println("* ".repeat(i) + "+ ".repeat(lineLength - i));
}
0赞
alexwbt
6/10/2023
#2
for (int x = 0; x < 5; x++) {
for (int y = 0; y < 5; y++) {
System.out.print(x > y ? "* " : "+ ");
}
System.out.println();
}
你可能会想要这样的东西吗？
评论
1赞
azro
6/10/2023
请不要给出无解的答案
0赞
azro
6/10/2023
您是如何在 7 年前创建帐户的，现在才使用它？这是非常罕见的
0赞
Reilas
6/11/2023
#3
您可以利用 Arrays#fill 方法预填充 char 的二维数组。
然后，迭代以将相应的索引替换为星号。
char[][] characters = new char[5][5];
for (char[] row : characters) Arrays.fill(row, '+');
int count = 0;
for (char[] row : characters) {
for (int index = 0; index < count; index++)
row[index] = '*';
count++;
}
int index = 0;
for (char[] row : characters) {
for (char character : row) {
if (index++ != 0) System.out.print(" ");
System.out.print(character);
}
index = 0;
System.out.println();
}
输出
+ + + + +
* + + + +
* * + + +
* * * + +
* * * * +
此外，还可以使用允许输入值的方法。
void draw(int size, char charA, char charB) {
char[][] characters = new char[size][size];
for (char[] row : characters) Arrays.fill(row, charB);
int count = 0;
for (char[] row : characters) {
for (int index = 0; index < count; index++)
row[index] = charA;
count++;
}
int index = 0;
for (char[] row : characters) {
for (char character : row) {
if (index++ != 0) System.out.print(" ");
System.out.print(character);
}
index = 0;
System.out.println();
}
}
示例用法和输出。
draw(20, '@', '-');
- - - - - - - - - - - - - - - - - - - -
@ - - - - - - - - - - - - - - - - - - -
@ @ - - - - - - - - - - - - - - - - - -
@ @ @ - - - - - - - - - - - - - - - - -
@ @ @ @ - - - - - - - - - - - - - - - -
@ @ @ @ @ - - - - - - - - - - - - - - -
@ @ @ @ @ @ - - - - - - - - - - - - - -
@ @ @ @ @ @ @ - - - - - - - - - - - - -
@ @ @ @ @ @ @ @ - - - - - - - - - - - -
@ @ @ @ @ @ @ @ @ - - - - - - - - - - -
@ @ @ @ @ @ @ @ @ @ - - - - - - - - - -
@ @ @ @ @ @ @ @ @ @ @ - - - - - - - - -
@ @ @ @ @ @ @ @ @ @ @ @ - - - - - - - -
@ @ @ @ @ @ @ @ @ @ @ @ @ - - - - - - -
@ @ @ @ @ @ @ @ @ @ @ @ @ @ - - - - - -
@ @ @ @ @ @ @ @ @ @ @ @ @ @ @ - - - - -
@ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ - - - -
@ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ - - -
@ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ - -
@ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ -
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