Question

基本上我需要做的是将名称（第1行）的间距与价格（第2行）相匹配，但它没有按计划进行，我不确定原因。无论出于何种原因，我从来没有使用一组测试代替价格的问题，但现在我已将它切换为双倍，间距非常小。

输出：

Chips               Cookies             Applesauce          Cracker-n-Cheese    
0.75             1.0              0.5                 1.0                       

Apple               Snickers            BabyRuth            MilkyWay            
0.5                    1.0                       1.0                       1.0                       

M&M's               Kit-Kat             TrailMix            CrunchyCheetos      
1.0              1.0                1.5                 0.75                        
What would you like to buy?

代码：

    for (int i = 1; i <= 3; i++)
    {
        for (int j = 1; j <= 4; j++)
        {
            /*System.out.println("What is the name of the snack item you'd like to add to row " + i +", column " + j + "?");
            name = in.next();
            System.out.println("What is the price of  " + name +"?");
            price = in.nextDouble();
            product = new Product(name, price);
            products[i-1][j-1] = product;*/ 

            //Change back to what's above when done testing
            name = fin.next();
            price =fin.nextDouble();
            product = new Product(name, price);
            products[i-1][j-1] = product;


            if(i == 1 && j == 1)
                max = name.length();
            else if(name.length() > max)
                max = name.length();
        }
    }

    System.out.println("\n\n ");
    while (!in.equals("-999"))
    {
        for (int i = 0; i < 3; i++)
        {
            System.out.println();
            for (int j = 0; j < 4; j++)
            {
                numSpaces = max + 4 - products[i][j].getName().length();
                System.out.print(products[i][j].getName());
                for (int k = 0; k < numSpaces; k++)
                    System.out.print(" ");
            }
            System.out.println();
            for (int j = 0; j < 4; j++)
            {
                len = "" + products[i][j].getPrice(); //Can't cast from double to string :(
                numSpaces2 = numSpaces + products[i][j].getName().length() - len.length();//Doesnt work
                System.out.print(products[i][j].getPrice());
                for (int k = 0; k < numSpaces2; k++)
                    System.out.print(" ");
            }
            System.out.println();
        }


        System.out.println("What would you like to buy?");
        itemRequested = in.next();

        for (int i = 0; i < 3; i++)
        {
            for (int j = 0; j < 4; j++)
            {
                if (itemRequested.equalsIgnoreCase(products[i][j].getName()))
                    boughtItem = products[i][j];
            }
        }

        if(boughtItem != null)
        {
            System.out.println("Thank you for selecting " + boughtItem.getName() + "!\nThat will cost $" + boughtItem.getPrice());
            System.out.println();
            //Add delay for 7 seconds later
        }
        else
        {
            System.out.println("We dont carry that!\n");
            //Add delay for 7 seconds later
        }

    }

    in.close();

}

Answer 1

如果您打印制表符（\t），则会将其后的输出与下一个制表符对齐。那你就不用数字了。

Answer 2

那里有两个问题

您不知道将双精度转换为字符串 - Converting double to string
当您按照＆＃34; max＆＃34;

输出间隔逻辑错误

2 个答案: