java打印菱形代码_java打印菱形代码

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1.任意菱形

//菱形
        Scanner myscanner = new Scanner(System.in);
        int n = myscanner.nextInt();
        for (int i = 0; i < n / 2 + 1; i++) {//控制行数
            for (int j = 0; j < n / 2 - i; j++) {//打印空格
                System.out.print(" ");
            }
            for (int k = 0; k < 2 * i +1; k++) {//打印*
                System.out.print("*");
            }
            System.out.println("\n");
        }
        for (int i = 1; i < n / 2 + 1; i++) {
            for (int j = 0; j < i; j++) {
                System.out.print(" ");
            }
            for (int k = 2 * (n / 2 - i) + 1; k > 0; k--) {
                System.out.print("*");
            }
            System.out.println("\n");
        }

 2.空心菱形

方法1

int n;
        Scanner myscanner = new Scanner(System.in);
        n = myscanner.nextInt();
        for (int i = 0; i < n / 2 + 1; i++) {//控制行数
            for (int j = 0; j < n / 2 + 1 - i; j++) {
                System.out.printf(" ");
            }
            for (int k = 0; k < 2 * i + 1; k++) {
                if (k == 0 || k == 2 * i){//输出第一颗和最后一颗*
                    System.out.printf("*");
                }else System.out.printf(" ");
            }
            System.out.printf("\n");//控制换行
        }

        for (int i = n / 2; i >= 0 ; i--) {
            for (int j = n / 2 - i + 1; j > 0 ; j--) {
                System.out.printf(" ");
            }
            for (int k = 0; k < 2 * i + 1; k++) {
                if (k == 0 || k == 2 * i){//输出第一颗和最后一颗*
                    System.out.printf("*");
                }else System.out.printf(" ");
            }
            System.out.printf("\n");
        }

方法2

Scanner myscanner = new Scanner(System.in);
int n = myscanner.nextInt();
for (int i = -n; i <= n; i++) {
    for (int j = -n; j <= n; j++) {
        int k = Math.abs(i) + Math.abs(j);
        if (k == n){
            System.out.printf("*");
        }else {
            System.out.printf(" ");
        }
    }
    System.out.println("\n");
}

 3.边框菱形

        Scanner myscanner = new Scanner(System.in);
        int n = myscanner.nextInt();
        for (int i = -n; i <= n; i++) {
            for (int j = -n; j <= n; j++) {
                int k = Math.abs(i) + Math.abs(j);
                if (k >= n){
                    System.out.printf("*");
                }else {
                    System.out.printf(" ");
                }
            }
            System.out.println("\n");
        }

4.数字菱形

Scanner myscanner = new Scanner(System.in);
        int n = myscanner.nextInt();
        for (int i = 0; i < n; i++) {
            int k = 1;
            int j;
            for (j = 0; j < Math.abs(n / 2 -i); j++) {
                System.out.printf(" ");
            }
            for ( j = 0; j < n - 2 * Math.abs(n / 2 - i); j++) {
                System.out.print(k);
                if (j < n / 2 - Math.abs(n / 2 -i)){
                    k++;
                }else {
                    k--;
                }
            }
            System.out.println("\t");

        }