用java写出菱形12321

以下是用 Java 写出菱形 12321 的代码：

public class DiamondPattern {
    public static void main(String[] args) {
        int n = 5;
        for (int i = 1; i <= n; i++) {
            for (int j = 1; j <= n - i; j++) {
                System.out.print(" ");
            }
            for (int k = i; k >= 1; k--) {
                System.out.print(k);
            }
            for (int l = 2; l <= i; l++) {
                System.out.print(l);
            }
            System.out.println();
        }
        for (int i = n - 1; i >= 1; i--) {
            for (int j = 1; j <= n - i; j++) {
                System.out.print(" ");
            }
            for (int k = i; k >= 1; k--) {
                System.out.print(k);
            }
            for (int l = 2; l <= i; l++) {
                System.out.print(l);
            }
            System.out.println();
        }
    }
}

输出结果为：

    1
   212
  32123
 4321234
543212345
 4321234
  32123
   212
    1