字符计数在Java中不累加

Question

I am writing a Java program that goes through a file and provides counts of characters. The problem I'm having is that my counts aren't adding up. When I add the isAlphabetic(char c) and isDigit(char c) , they do not equal the isLetterOrDigit(char c) method (please forgive me if I'm using the wrong terminology).

What am I missing? Here is a copy of my code so far.

for (String word : words) {
                char[] ch = word.toCharArray();
                for (int i = 0; i < word.length(); i++) {
                    if (Character.isBmpCodePoint(ch[i])) {
                        charCount++;
                        if (Character.isLetterOrDigit(ch[i])) {
                            alphnumCount++;
                        }
                        if (Character.isAlphabetic(ch[i])) {
                            alphabetCount++;
                        }
                        if (Character.isDigit(ch[i])) {
                            numericCount++;
                        }
                    }
                }
            }
            // Reading next line into currentLine
            currentLine = reader.readLine();
        }
        // Printing charCount, wordCount and lineCount
        System.out.println("Number Of Chars In..Lab.docx File : " + charCount);
        System.out.println("Number Of Alph+Numeric Chars In..Lab.docx File : " + alphnumCount);
        System.out.println("Number Of Alphabet Chars In..Lab.docx File : " + alphabetCount);
        System.out.println("Number Of Numeric Chars In..Lab.docx File : " + numericCount);
        System.out.println("Number Of Words In..Lab.docx File : " + wordCount);
        System.out.println("Number Of Lines In..Lab.docx File : " + lineCount);
        System.out.println(alphabetCount + numericCount - alphnumCount);

        reader.close(); // Closing the reader
    }
}

Answer 1

I think the Problem here is that you are reading an *.docx file.

If I use a simple text file with the following content your script works.

Test123
7asdf

The output is:

Number Of Chars In..CSCI_1136_Lab6.docx File : 12
Number Of Alph+Numeric Chars In..CSCI_1136_Lab6.docx File : 12
Number Of Alphabet Chars In..CSCI_1136_Lab6.docx File : 8
Number Of Numeric Chars In..CSCI_1136_Lab6.docx File : 4
Number Of Words In..CSCI_1136_Lab6.docx File : 2
Number Of Lines In..CSCI_1136_Lab6.docx File : 2
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If you want to count the characters in a *.docx file that is not possible in this way, because you are interpreting the bytes of that file as String, which they don't are.

DOCX is written in an XML format, which consists of a ZIP archive file containing XML and binaries.

From forensicswiki .

So *.docx files are not stored in plain text, which you are expecting in your code.

Another point is that you are using Character.isAlphabetic() instead of Character.isLetter() :

Form the docs for Character.isAlphabetic() :

Determines if the specified character (Unicode code point) is an alphabet.

A character is considered to be alphabetic if its general category type, provided by getType(codePoint), is any of the following:

• UPPERCASE_LETTER
• LOWERCASE_LETTER
• TITLECASE_LETTER
• MODIFIER_LETTER
• OTHER_LETTER
• LETTER_NUMBER

or it has contributory property Other_Alphabetic as defined by the Unicode Standard.

Form the docs for Character.isLetter() :

Determines if the specified character (Unicode code point) is a letter.

A character is considered to be a letter if its general category type, provided by Character.getType(ch), is any of the following:

• UPPERCASE_LETTER
• LOWERCASE_LETTER
• TITLECASE_LETTER
• MODIFIER_LETTER
• OTHER_LETTER

Not all letters have case. Many characters are letters but are neither uppercase nor lowercase nor titlecase.

So there is a difference between both methods. The method Character.isLetterOrDigit() is using isLetter() and isDigit() ;

Determines if the specified character (Unicode code point) is a letter or digit.

A character is considered to be a letter or digit if either isLetter(codePoint) or isDigit(codePoint) returns true for the character.

From the docs for Character.isLetterOrDigit() .

So if you use Character.isLetter() instead of Character.isAlphabetic() your result should be correct.

This is my result for a *.docx file using Character.isLetter() :

Number Of Chars In..CSCI_1136_Lab6.docx File : 5923
Number Of Alph+Numeric Chars In..CSCI_1136_Lab6.docx File : 1758
Number Of Alphabet Chars In..CSCI_1136_Lab6.docx File : 1550
Number Of Numeric Chars In..CSCI_1136_Lab6.docx File : 208
Number Of Words In..CSCI_1136_Lab6.docx File : 66
Number Of Lines In..CSCI_1136_Lab6.docx File : 48
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