在文本文件中查找字符串的方法。然后将以下行达到一定限度 [英] Method to find string inside of the text file. Then getting the following lines up to a certain limit
本文介绍了在文本文件中查找字符串的方法。然后将以下行达到一定限度的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
所以这就是我到目前为止:
So this is what I have so far :
public String[] findStudentInfo(String studentNumber) {
Student student = new Student();
Scanner scanner = new Scanner("Student.txt");
// Find the line that contains student Id
// If not found keep on going through the file
// If it finds it stop
// Call parseStudentInfoFromLine get the number of courses
// Create an array (lines) of size of the number of courses plus one
// assign the line that the student Id was found to the first index value of the array
//assign each next line to the following index of the array up to the amount of classes - 1
// return string array
}
我知道如何查找文件是否包含我想要查找的字符串,但我不知道如何检索它所在的整行。
I know how to find if a file contains the string I am trying to find but I don't know how to retrieve the whole line that its in.
这是我第一次发帖所以如果我做错了请告诉我。
This is my first time posting so If I have done anything wrong please let me know.
推荐答案
你可以这样做:
File file = new File("Student.txt");
try {
Scanner scanner = new Scanner(file);
//now read the file line by line...
int lineNum = 0;
while (scanner.hasNextLine()) {
String line = scanner.nextLine();
lineNum++;
if(<some condition is met for the line>) {
System.out.println("ho hum, i found it on line " +lineNum);
}
}
} catch(FileNotFoundException e) {
//handle this
}
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