Question

我的代码片段：

...
    System.out.println("\t" + "MONTH |" + "\t" + "HIGH | " + "\t" + "LOW |" + "\t" + "AVERAGE |" + "\t" + "RANGE");
    System.out.println("\t" + "______________________________________________");

    main.averageMonthOne(hightemp, lowtemp);

    in1.close();
    out.close();                
}//end of main 


private static double averageMonthOne (int hightemp, int lowtemp)
{
    double avgM = (hightemp + lowtemp)/2;
    System.out.println(avgM);
    return avgM;
}

我希望能够使用我从averageMonthOne收到的平均值，并将其分别放在println中的“AVERAGE”字样下面。这可能吗？

预期产出：

MONTH | HIGH | LOW | AVERAGE | RANGE
_____________________________________
                      30.0

Answer 1

使用System.out.printf()并相应地格式化！

Answer 2

非常可能只需将您的代码更改为以下内容：

...
System.out.println("\t" + "MONTH |" + "\t" + "HIGH | " + "\t" + "LOW |" + "\t" + "AVERAGE |" + "\t" + "RANGE");
System.out.println("\t" + "______________________________________________");

double myresult = main.averageMonthOne(hightemp, lowtemp);
System.out.println("\t\t\t\t" + myresult);

in1.close();
out.close();

} //主要结束

private static double averageMonthOne（int hightemp，int lowtemp） { double avgM =（hightemp + lowtemp）/ 2; 的System.out.println（avgM）; 返回avgM; }

Answer 3

如果我在哪里，我会创建一个字符串数组，您可以在其中输入数字。例如：

try{
    BufferedReader bufferedReader = new BufferedReader(new FileReader("fileName.txt"));
    String[] numbers = new String[5];

    for(int i=0; i<5; i++){     // here you only read 5 values from a file, line by line. If the file is formatted differently you have to read them differently.
       numbers[i] = bufferedReader.readLine();
    }
}catch(IOException io){ ... }

然后将字符串数组格式化为一个单独的String行，如下所示：

String printedNumbers = "";
for(int i=0; i<numbers; i++){
    printNumbers+="\t";            // every table cell is seperated by a TAB
    if(numbers[i] == null){        // if the cell is empty
        printNumbers +=\t;         //    fill it with a TAB
    }else{ 
        printNumbers +=numbers[i]; // otherwise put the number in
    }
}

这可能只有5个值，但你不应该用whitspace填补你的“表格单元格”之间的空白。最后要打印你的表格：

System.out.println("\t" + "MONTH |" + "\t" + "HIGH | " + "\t" + "LOW |" + "\t" + "AVERAGE |" + "\t" + "RANGE");
System.out.println("\t" + "______________________________________________");
System.out.println(printNumbers);

Answer 4

如果您有固定数量的字符串，则可以填充或清空。准备好一堆变量：

String avg = "", high = "", low = "", ...;

接下来，使用值填写您需要的内容：

avg = averageMonthOne(hightemp, lowtemp);
high = ...;
low = ...;

最后，调用String.format方法将其全部收集起来：

String s = String.format("%s %s %s", avg, high, low);
System.out.println(s);

您可以将上述内容缩短为

System.out.format("%s %s %s", avg, high, low);

根据http://docs.oracle.com/javase/6/docs/api/java/util/Formatter.html，有很多格式化和间隔输出的选项，只需相应地更改格式方法的第一个参数。

如何在println中的方法中使用返回给我的内容？

4 个答案: