Question

java中，怎么利用循环输出一个等边空心三角形

Answer 1

public class A {
public static void main(String[] args) {
printTriangle(5);// 输出5行5列的等边，可以改变这个数字
}
private static void printTriangle(int n) {
for (int i = 1; i <= n; i++) {
for (int j = 1; j <= n - i; j++) {
System.out.print(" ");
}
if (i != n) {
for (int k = 1; k <= 2 * i - 1; k++) {
if (k == 1 || k == 2 * i - 1) {
System.out.print("*");
} else {
System.out.print(" ");
}
}
} else {
for (int k = 1; k <= 2 * i - 1; k++) {
if (k % 2 != 0) {
System.out.print("*");
} else {
System.out.print(" ");
}
}
}
System.out.println();
}
}
}

希望对你有帮助

Answer 2

使用For循环和二维数组.