Question

当我运行我的程序时，我明白了：

run:
                                            Heat Index: Key West, Florida



            Jan  Feb  Mar  Apr  May  Jun  Jul  Aug  Sep  Oct  Nov  Dec
____________________________________________________________________________________________________________________________________

Temperature:      70.3      70.8      73.8      77.0      80.7      83.4      84.5      84.4      83.4      80.2      76.3      72.0
   Humidity:      69.0      67.0      66.0      64.0      66.0      69.0      67.0      67.0      70.0      69.0      69.0      70.0BUILD SUCCESSFUL (total time: 0 seconds)

我想显示这个，以便月份与每列数字对齐，例如Jan与第一列数字对齐，依此类推。我知道如果月份对齐，每列数字之间有7个空格。问题是，我不知道如何创建空格，比如空格，所以这些月份不会出现在温度：标题之上，带有printf。任何帮助将不胜感激。

Answer 1

您需要使用System.out.printf()并为宽度传递适当的标记，有关格式化的语法，请参阅here。

String[] months = 
{"Jan",  "Feb",  "Mar",   "Apr",  "May", "Jun",   "Jul",  "Aug",
 "Sep",  "Oct",  "Nov",  "Dec"};
Double[] temper = 
    {70.3, 70.8, 73.8, 77.0, 80.7, 83.4, 84.5, 84.4, 83.4, 80.2, 76.3, 72.0};
Double[] humid = 
    {69.0, 67.0, 66.0, 64.0, 66.0, 69.0, 67.0, 67.0, 70.0, 69.0, 69.0, 70.0};

System.out.printf("            %7s%7s%7s%7s%7s%7s%7s%7s%7s%7s%7s%7s\n",
    (Object[])months);
System.out.printf("________________________________________"
    + "________________________________________________________\n");
System.out.printf("Temperature:%7.1f%7.1f%7.1f%7.1f%7.1f"
    + "%7.1f%7.1f%7.1f%7.1f%7.1f%7.1f%7.1f\n", 
    (Object[])temper);
System.out.printf("   Humidity:%7.1f%7.1f%7.1f%7.1f%7.1f"
    + "%7.1f%7.1f%7.1f%7.1f%7.1f%7.1f%7.1f\n",
    (Object[])humid);

Answer 2

试试这个..你可以在每个印刷品之间指定空格..

        String[] day = {"Sun", "Mon", "Tues", "Friday","Saturday"};
        for(String s :day){
            System.out.printf("%15s", s);
        }

Answer 3

这将打印四个空格加上本月占用的三个空格。此外，如果你只想打印字符串，你真的不需要printf。以下是两个选项。

System.out.printf("    %s", month);

或

System.out.print("    " + month);

我还建议在不对空间进行硬编码的情况下提出一种方法。也许设置一个循环来打印可以改变宽度的空间。

Answer 4

试试这个的System.out.println（＆＃34; \ n＆＃34）;

java用printf创建空格

4 个答案: