测试帐号中是否只有一个连字符的存在。

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英文:

Test for the presence of only one hyphen in the account number

问题

我想使用只有字符串方法而没有for循环来重写以下代码。

private static boolean isAccountFormatCorrect(String name)  {
    int m = name.length() - name.replace("-", "").length();
    
    if (m >= 2) { 
        throw new BadAccountInputException("Only one hyphen allowed in account number");
    }
     
    return true;
}
英文:

I would like to rewrite the following code using only String methods, without for loops.

// Run the QuestionGenerator and test for the error condition 
// indicated. If the account number has a valid format 
// according to the requirement set out in the question generator, return
// true, otherwise false.

private static boolean isAccountFormatCorrect(String name)  {
	int m = 0;
	for(int i = 0; i < name.length(); i++) {
		char a = name.charAt(i); 
		if (a == '-') { 
			m++; 
		}
	} 

	if (m >= 2) { 
		throw new BadAccountInputException("Only one hyphen allowed in account number");
	}
     
	return true;
}

答案1

得分: 1

Compare the first index of a hyphen with the last index where it is found. If they are equal, then there was only one.

private static boolean isAccountFormatCorrect(String name)  {
    if(name.indexOf('-') != name.lastIndexOf('-')){
      throw new BadAccountInputException("Only one hyphen allowed in account number");
    }
    return true;
}

However, it seems you want to return a boolean indicating whether or not the account is valid, in which case there is no need to throw exceptions.

private static boolean isAccountFormatCorrect(String name)  {
    return name.indexOf('-') == name.lastIndexOf('-');
}

If you need to ensure there is exactly one hyphen, you will need to check that the index is not -1.

private static boolean isAccountFormatCorrect(String name)  {
    int idx = name.indexOf('-');
    return idx != -1 && idx == name.lastIndexOf('-');
}
英文:

Compare the first index of a hyphen with the last index where it is found. If they are equal, then there was only one.

private static boolean isAccountFormatCorrect(String name)  {
    if(name.indexOf('-') != name.lastIndexOf('-')){
      throw new BadAccountInputException("Only one hyphen allowed in account number");
    }
    return true;
}

However, it seems you want to return a boolean indicating whether or not the account is valid, in which case there is no need to throw exceptions.

private static boolean isAccountFormatCorrect(String name)  {
    return name.indexOf('-') == name.lastIndexOf('-');
}

If you need to ensure there exactly one hyphen, you will need to check that the index of not -1.

private static boolean isAccountFormatCorrect(String name)  {
    int idx = name.indexOf('-');
    return idx != -1 && idx == name.lastIndexOf('-');
}

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  • 本文由 发表于 2020年7月23日 02:11:17
  • 转载请务必保留本文链接:https://go.coder-hub.com/63040635.html
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