用Java语言两个for打印出菱形

以下是用Java语言打印菱形的示例代码：

public class PrintDiamond {
    public static void main(String[] args) {
        int n = 5; // 菱形的行数
        for (int i = 1; i <= n; i++) {
            for (int j = 1; j <= n - i; j++) {
                System.out.print(" ");
            }
            for (int k = 1; k <= 2 * i - 1; k++) {
                System.out.print("*");
            }
            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 = 1; k <= 2 * i - 1; k++) {
                System.out.print("*");
            }
            System.out.println();
        }
    }
}

输出：

    *
   ***
  *****
 *******
*********
 *******
  *****
   ***
    *