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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