如何在java中打印乘法表

Question

我必须创建一个打印时间表的程序 1）有多种方法。 2）读取两个数字，其中一个是上限，第二个是表格的深度（基本上是行和列）。从限制正方形表开始，它只能是例如10x10或12x12。 3）有一个循环，以便用户可以使用不同的输入再次运行它。 4）使用扫描仪读取I / P. 当您为第一个数字输入3并且为第二个数字输入8时，输出应该看起来像这样：

但它是这样的：Output

import java.util.Scanner;
public class TimesTableRewrite
{
    public static void main (String[] args) 
    {   
        Scanner in;
        in = new Scanner (System.in);
        boolean runAgain = false;
        header();
        String response;
        do 
        {   

            printTable();
            System.out.println("\nDo you want to go again? Y or N?");
            response = in.next();
            if ((response.charAt(0)=='Y'||response.charAt(0)=='y'))
                {
               runAgain = true;
                }
            else
                {
               runAgain = false;    
                }
         }
       while (runAgain);
        footer();       
    }

    public static void printTable()
    {
        Scanner in;
        in = new Scanner (System.in);

        int height;
        int length;
        System.out.println("Enter the first number to set up how far down you want the table to go.");
        height= Integer.parseInt(in.next());
        System.out.println("Enter the second number to extend the table horizontally");
        length = Integer.parseInt(in.next());

        for (int i = 1; i <= height; i++ )
        {
            for (int j = 1; j <= length; j++ ) //j is number of columns
            {
                if (i<height)
                    System.out.format("%4d", + i*j);
                else
                    System.out.format("%4d", + i*j);
                if (i==height)
                {
                    System.out.println();
                }
            }   
        }
        for (int i = 1; i <= height; i++ )
        {
            for (int j = 1; j <= length; j++ ) 
            {
                if (j<length)
                    System.out.format("%4d", + i*j);
                else
                    System.out.format("%4d", + i*j);
                if (j==length)
                {
                    System.out.println();
                }   
            } 
        }
    }
    public static void header()
    {
        System.out.println("This program will help you practice your times tables!");
        System.out.print("This newer version will allow you to go beyond the 12 times tables!");
        System.out.println("It will let you choose your upper limit \nand how deep the times table will go.");
        System.out.println("Let's go!");
        System.out.println("\nPlease enter two numbers to generate a multiplication table.");
    }   
    public static void footer ()
    {
        System.out.println("That's all folks! See you next week!");
    }           
}

Answer 1

替换它：

for (int i = 1; i <= height; i++ )
{
    for (int j = 1; j <= length; j++ ) //j is number of columns
    {
        if (i<height)
            System.out.format("%4d", + i*j);
        else
            System.out.format("%4d", + i*j);
        if (i==height)
        {
            System.out.println();
        }
    }   
}
for (int i = 1; i <= height; i++ )
{
    for (int j = 1; j <= length; j++ ) 
    {
        if (j<length)
            System.out.format("%4d", + i*j);
        else
            System.out.format("%4d", + i*j);
        if (j==length)
        {
            System.out.println();
        }   
    } 
}

有了这个：

for (int i = 1; i <= height; i++ )
{
    for (int j = 1; j <= length; j++ ) //j is number of columns
    {
        System.out.print(i * j);
        System.out.print("\t"); //We add a tab after each number to form every column.
    }   

    System.out.println(); //We add a berakline for each row.
}