[英]Java search a text file
I have made a phone bill system takes input of phone number called, date of the call and call length. 我已经制作了一个电话账单系统,输入了所谓的电话号码,通话日期和通话时长。 it the saves it in to a text file. 它将它保存到文本文件中。 what i have not been able to do is search the text file for the phone number. 我无法做的是在文本文件中搜索电话号码。
just do linear search (iterating over your phone list) : 只做线性搜索(迭代你的手机列表):
public static List<Phone> searchPhone(final String phoneNumber, final List<Phone> phoneList) {
List<Phone> matchedPhone = new ArrayList<Phone>();
for(Phone phone: phoneList) {
if ( phone.getphoneNumber().equals(phoneNumber) ) {
matchedPhone.add(phone);
}
}
return matchedPhone;
}
also for readability, don't make your method parameter as output. 同样为了便于阅读,请不要将您的方法参数作为输出。 its not good practice, so you should change your method from: 这不是一个好习惯,所以你应该改变你的方法:
static void readList(List<Phone> phoneListIn) {
}
to: 至:
static List<Phone> readList(final String fileName) {
}
output arguments should be avoided as possible as you can 尽可能避免输出参数
Here is a link to some code that I found using Google. 这是我使用Google找到的一些代码的链接。
http://www.dreamincode.net/forums/topic/48905-search-inside-a-text-file/ http://www.dreamincode.net/forums/topic/48905-search-inside-a-text-file/
Perform Collections.sort(List list);
执行Collections.sort(List list);
Then perform Collections.binarySearch(List list, Object key).
然后执行Collections.binarySearch(List list, Object key).
This should achieve the searching efficiently. 这应该有效地实现搜索。
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