将零添加到单个数字,是否可能？

Question

public class MultiplicationTable {
public static void main (String[]a){

    int[] x;
    x = new int[10];
    int i;
    int n=0;

    for (i=0;i<x.length;i++){
        n++;
        x[i]=n;
        System.out.print(x[i] + " ");
    }

    System.out.println();
    for (i=0;i<x.length;i++)            
        System.out.print(x[0] * x[i] + " ");

    System.out.println();
    for (i=0;i<x.length;i++)            
        System.out.print(x[1] * x[i] + " ");

    System.out.println();
    for (i=0;i<x.length;i++)            
        System.out.print(x[2] * x[i] + " ");

    System.out.println();
    for (i=0;i<x.length;i++)            
        System.out.print(x[3] * x[i] + " ");

    System.out.println();
    for (i=0;i<x.length;i++)            
        System.out.print(x[4] * x[i] + " ");

    System.out.println();
    for (i=0;i<x.length;i++)            
        System.out.print(x[5] * x[i] + " ");

    System.out.println();
    for (i=0;i<x.length;i++)            
        System.out.print(x[6] * x[i] + " ");

    System.out.println();
    for (i=0;i<x.length;i++)            
        System.out.print(x[7] * x[i] + " ");

    System.out.println();
    for (i=0;i<x.length;i++)            
        System.out.print(x[8] * x[i] + " ");

    System.out.println();
    for (i=0;i<x.length;i++)            
        System.out.print(x[9] * x[i] + " ");


}
}

这是一个显示乘法表的程序,如下所示:

1 2 3 4 5 6 7 8 9 10

1 2 3 4 5 6 7 8 9 10

2 4 6 8 10 12 14 16 18 20

3 6 9 12 15 18 21 24 27 30

4 8 12 16 20 24 28 32 36 40

5 10 15 20 25 30 35 40 45 50

6 12 18 24 30 36 42 48 54 60

7 14 21 28 35 42 49 56 63 70

8 16 24 32 40 48 56 64 72 80

9 18 27 36 45 54 63 72 81 90

10 20 30 40 50 60 70 80 90 100

================================================== =============

它正在运行且正确,但我希望它看起来像这样:

01 02 03 04 05 06 07 08 09 10

01 02 03 04 05 06 07 08 09 10

02 04 06 08 10 12 14 16 18 20

03 06 09 12 15 18 21 24 27 30

04 08 12 16 20 24 28 32 36 40

05 10 15 20 25 30 35 40 45 50

06 12 18 24 30 36 42 48 54 60

07 14 21 28 35 42 49 56 63 70

08 16 24 32 40 48 56 64 72 80

09 18 27 36 45 54 63 72 81 90

10 20 30 40 50 60 70 80 90 100

===============================================

有什么办法吗？

Answer 1

是的你可以!您可以使用String.format向输出添加零填充.

例:

String.format("%05d", 2)会产生00002.

对当前代码的一些改进:

我不确定你为什么打算将数字存储在一个数组中(可能是为了练习目的),但这并不是必要的,因为无论如何它都是从1到10.但如果你想这样做,你不需要两个i和n.

for (i=0; i<x.length; i++){
    x[i] = i+1;
    System.out.print(x[i] + " ");
}

其次,我确信你意识到你有很多重复的代码,并且它是相当顺序的.你可以使用2个嵌套for循环,而不是10个单循环:

for (int row = 1; row <= 10; row++) {
    for (int col = 1; col <= 10; col++)
        System.out.print(String.format("%03d", row * col));
    System.out.println();
}