如何在println的方法中使用返回给我的东西？

Question

Snippet of my code:

...
    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;
} 

I want to be able to use the average I received from averageMonthOne and place it respectively under a the word "AVERAGE" in the println. Is that possible?

Expected Output:

MONTH | HIGH | LOW | AVERAGE | RANGE
_____________________________________
                      30.0

Answer 1

使用System.out.printf()并相应地格式化！

Answer 2

Very possible Just change your code to be like the following:

...
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();                

}//end of main

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

Answer 3

If I where you I would create an Array of Strings where you put the numbers you get. For example:

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){ ... }

Then you format the array of strings into one single String line like this:

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
    }
}

This may be a little much for only 5 values, but you shouldn't have to fill the gaps between your "table cells" with whitspaces. In the end to print your table do:

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

Answer 4

This works, if you have a fixed number of Strings, that can be filled or empty. Have a bunch of variables ready like this:

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

Next, fill those you need with values:

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

Lastly, call the String.format method to gather it all up:

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

You could shorten the above to

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

According to http://docs.oracle.com/javase/6/docs/api/java/util/Formatter.html , there are lots of options for formatting and spacing the output, just change the first argument of the format method accordingly.