从文件输入中查找java中的最大值 [英] Find max value in java from file input

问题描述

我是Java的新手，我正在尝试编写一个程序，要求用户输入仅包含数字的txt文件的名称，程序将输出数字的总和，平均值，最大值和最小值在文件中。我已经编写了大部分程序，但是我很难找到值的最大值和最小值。您可以提供的任何信息都会有所帮助，如果我不够清楚，我可以尝试详细说明。到目前为止我的代码是：

I'm new to Java and I am trying to write a program that asks the user to input the name of a txt file containing only numbers, and the program will output the sum, average, max, and min of the numbers in the file. I have written most of the program, however I am stuck trying to find the max and min of the values. Any information you can give would be helpful, and if I was not clear enough I can try to elaborate. My code so far is:

public class NumberFile{
    public static void main(String[] args){

      boolean goodName = false;
      int currentNumber, sum = 0, numberCount=0;
      Scanner numberFile = null;
      FileReader infile; 

      Scanner input = new Scanner(System.in);
      System.out.println("Please enter the name of the file you wish to import: ");
      String fileName = input.nextLine();



      while (!goodName){
        try{
          infile = new FileReader(fileName);
          numberFile = new Scanner(infile);
          goodName = true;
        }
        catch (IOException e){
          System.out.println("invalid file name, please enter another name");
          fileName = input.nextLine();
        }
      }
      while (numberFile.hasNextInt()){
        currentNumber = numberFile.nextInt();
        sum+=currentNumber;
        numberCount++;
      }
      System.out.println("The sum of the numbers is " +sum);

      System.out.println("The average of the numbers is " + ((double) sum)/numberCount);



    } // end main
} // end class

推荐答案

声明两个int变量 - 一个min和一个max。
用Integer.MAX_VALUE初始化min，用Integer.MIN_VALUE初始化最小值。

Declare two int variables - one "min" and one "max". Initialize min with Integer.MAX_VALUE and max with Integer.MIN_VALUE.

然后在你的while循环中检查每个数字对这些变量 - 即。如果number小于min，则将其指定为新的min值。
如果它大于max，则将其指定为新的max值。

Then within your while loop check every number against those variables - ie. if number is smaller than "min" then assign it as a new "min" value. If its larger than "max" then assign it as new "max" value.

希望这澄清，它非常简单所以我没有放任何代码所以你可以自己实现它。

Hope this clarifies, its very simple so I didnt put any code so you can implement it yourself.

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