Question

我需要编写一个程序来计算字符串中的某些标点符号。我有这个代码我认为可以工作，但在每个charAt，我有一个错误，说分配的左手必须是一个变量。需要帮助解决这个问题

public static void main(String[] args)
{
    Scanner kbd = new Scanner (System.in);

    System.out.println("Enter a string: ");
    String s = kbd.next();

    countPunctuation(s);
}
public static int countPunctuation(String s)
{
    int periodCount = 0;
    int commaCount = 0;
    int semicolonCount = 0;
    int colonCount = 0;
    int exclamationCount = 0;
    int questionCount = 0;
    int total = 0;


    for(int i = 0; i < s.length(); i++)
    {
        if(s.charAt(i) = ".")
        {
            periodCount++;
            total++;
        }
        if(s.charAt(i) = ",")
        {
            commaCount++;
            total++;
        }
        if(s.charAt(i) = ";")
        {
            semicolonCount++;
            total++;
        }
        if(s.charAt(i) = ":")
        {
            colonCount++;
            total++;
        }
        if(s.charAt(i) = "!")
        {
            exclamationCount++;
            total++;
        }
        if(s.charAt(i) = "?")
        {
            questionCount++;
            total++;
        }

    }

    System.out.println("There are " + periodCount + " periods in this String.");
    System.out.println("There are " + commaCount + " commas in this String.");
    System.out.println("There are " + semicolonCount + " semicolons in this String.");
    System.out.println("There are " + colonCount + " colons in this String.");
    System.out.println("There are " + exclamationCount + " exclamation marks in this String.");
    System.out.println("There are " + questionCount + " quesiton marks in this String.");


    return total;
}

Answer 1

平等检查是==而不是=。您需要具有if(s.charAt(i) == '.')之类的内容，或者您可以在这种情况下使用switch：

for(int i = 0; i < s.length(); i++) {
    switch(s.charAt(i)) { 
     case '.':
        periodCount++;
        break;
     case ',':
        commaCount++;
        break;
     ... // similar conditions for others
    }
    total += 1;
}

Answer 2

如果这会有帮助，请点击，但我发现了一个小错误

更改：

String s = kbd.next();

要：

String s = kbd.nextLine();

我认为这绝对应该解决它。

为什么：

next();        -is mostly used for characters, as it doesn't get the whole line.
nextLine();    -gets the entire line, which for your code, you'd want.

就像那个人说的那样，你的使用

=   -instead of-   ==

＆＃34; =＆＃34;用于指定的变量和东西＆＃34; ==＆＃34;是检查，如if（String s ==＆＃34;;＆＃34;）

如何计算java中String中的标点符号？

2 个答案: