Question

大家好，我现在有一个程序应该只计算白色空间，但我的程序似乎在计算所有可以有人识别丢失或错误的位置？

public class SpaceCounter {
    public static void main(String[] args) {
        Scanner scan = new Scanner(SpaceCounter.class.getResourceAsStream("Test")) .useDelimiter("\\s"); // imports the text file and uses delimiter to count the spaces
        int counter1 = 0; //sets 1st counter 1

        while (scan.hasNextLine()) { // while loop
            scan.next(); // scanner goes onto next line
            counter1++; 
        }
        System.out.println("this file contains this amount of spaces: " + counter1);
   }
}

Answer 1

  int spaceCount = 0;
    for (char c : str.toCharArray()) {
         if (c == ' ') {
         spaceCount++;
    }
  }

你可以像这样实现它

Answer 2

更改你的while循环和代码，如下所示：

while (scan.hasNextLine()){ // while loop
     String s= scan.next(); // scanner goes onto next line
     counter1 += s.length() - s.replaceAll(" ", "").length();

    }

Answer 3

如果你想计算文本中的空格数量，并且真的想要使用Scanner，你可以使用这样的东西：

public class SpaceCounter {
    public static void main(String[] args) {
        Scanner scan = new Scanner(SpaceCounter.class.getResourceAsStream("Test")).useDelimiter("\\S*");
        int counter1 = 0;
        while (scan.hasNext()) {
            scan.next();
            counter1++; 
        }

        System.out.println("this file contains this amount of spaces: " +  counter1);
    }
}

Answer 4

我宁愿使用类似的东西：

// FIRST OF ALL: Delete the .useDelimiter("\\s") from your Scanner
while (scan.hasNextLine()) {
  String line = scan.nextLine();

  if (line.isEmpty()) {
    counter1++;
  } else {
    for (int i = 0; i < line.length(); i++) {
      if (Character.isWhitespace(line.charAt(i))) {
        counter1++;
      }
    }
  }
}

在Java中计算空白字符

4 个答案: