java - 如何使用格式化程序格式化二维数组之和？

Question

我必须将 2008 年选举中每个州的选票添加到二维数组中，但是当我运行代码时，它只对第一行求和，然后不断将自己添加到前面的总和中，像这样在右侧 51 次:

• 各州 奥巴马 麦凯恩 其他总计(按州)
• 阿拉巴马州 813479 1266546 19794 2099819 2426016 72985 等...
• 阿拉斯加 123594 193841 8762 2099819 2426016 72985 等...

但我只需每行添加一次每个州的总票数。

public static void main(String[] args) throws IOException  
{  
  // TODO code application logic here
  File election = new File("voting_2008.txt");  
  Scanner sc = new Scanner(election);  

  String[] states = new String[51];  
  int[][]votes = new int[51][4];  
  int[] Totalbystate = new int[votes.length];  

  for (int s=0; s < 51; s++)  
  {  
    states[s] = sc.nextLine();  
  }  

  for(int c=0; c < 3; c++)  
  {  
    for(int s=0; s < 51; s++)  
    {  
      votes[s][c] = sc.nextInt();  
    }  
  }  

  Formatter fmt = new Formatter();  
  fmt.format("%20s%12s%12s%12s%21s", "State", "Obama", "McCain", "Other", "Total by state");  
  System.out.println(fmt);  
  for (int s=0; s < 51; s++)  
  {  
    fmt = new Formatter();  
    fmt.format("%20s", states[s]);  
    System.out.print(fmt);  
    for(int c=0; c < 3; c++)  
    {  
      fmt = new Formatter();  
      fmt.format("%12d", votes[s][c]);  
      System.out.print(fmt);  
    }  
    int sum =0;  
    for(int row=0; row < votes.length; row++)  
    {  
      for (int col=0; col < votes[row].length; col++)  
      {  
        sum = sum + votes[row][col];  
      }  
      fmt = new Formatter();  
      fmt.format("%21d", sum);  
      System.out.print(fmt);  
    }  

    System.out.println();  
  }  
}  

Answer 1

but when I run the code it sums only the first row and then keeps adding itself to the previous sum 51 times to the right side like this:

看看你的代码:

int sum =0;
for(int row=0; row < votes.length; row++)
{   
    for (int col=0; col < votes[row].length; col++)
    {
        sum = sum + votes[row][col];
    }
    fmt = new Formatter();
    fmt.format("%21d", sum);
    System.out.print(fmt);  
}

看看您将 sum 设置为 0 的位置。现在考虑一下您应该将其设置为 0 的位置...