Question

帮助即时卡住..我们要制作两个程序，我们要求用户输入多少名员工，名字，姓氏，名称，然后将其存储到名为names.db的文件中。 ...我能够完成这个...我坚持第二个程序......假设这样做....通过要求用户输入员工名字来检索员工数据库，如果员工是发现然后打印该信息...如果没有，则打印未找到。

import java.util.Scanner;
import java.io.*;

public class RetrieveInfo
{
    public static void main(String[] args) throws IOException
    {

    //create scanner object for keyboard input
    Scanner keyboard = new Scanner(System.in);

    //open file
    File file = new File("Employee.db");
    Scanner inputFile = new Scanner(file);

    //ask for employee name
    System.out.print("enter the name of the employee. ");
    String firstName =keyboard.nextLine();

    //here is where im stuck...read the file and check of the empoyee is     
    here. We are learning about loops some im pretty sure its going to be a loop


    }

}

Answer 1

你应该通过你的线，如果数据在当前行，然后打印它。阅读完文件后：

String expectedemployee = null
for(String line : Files.readAllLines(Paths.get("/path/to/file.txt")) {

    if(line.contains(firstName) {
         expectedemployee = line;
         break;
    }
}
if(expectedemployee != null) {
    // print
} else {
    // you don't have any employee corresponding
}

或者您可以使用BufferedReader。

try (BufferedReader br = new BufferedReader(new FileReader(file))) {
    String line;
    while ((line = br.readLine()) != null || expectedemployee != null) {
       if(line.contains(firstName) {
          expectedemployee = line;
          break;
       }
    }
}

Answer 2

使用数据库而不是文件对于这种类型会更好。如果你想要文件，那么你应该尝试使用对象输入/输出流。

坚持如何阅读文件

2 个答案: