Question

我有一个员工条目的文本文件，如下所示：

000, first name1, middle name1
001, first name2, middle name2
002, first name3, middle name3
003, first name4, middle name4
004, first name5, middle name5

我有一个班级员工如下：

public class Employee {
    public int id;
    public String fName;
    public String mName;
    public String lName;
}

我已将文件内容读入数组。但我想要的是构造一个Employee类的对象数组，以及用每个条目初始化类的每个属性的方法。像这样：

Employee e[] = new Employee[5];

检查数组中每个对象的详细信息......

e[0].id = 000
e[0].fName = "first name1"
e[0].mName = "middle name1"
e[0].lName = "last name1"

然后，

e[1].id = 001

等等......

我有什么方法可以做到这一点吗？

Answer 1

public class Employee {
    public int id;
    public String fName;
    public String mName;
    public String lName;
    public Employee(String line) {
        String[] split = line.split(",");
        id = Integer.parseInt(split[0]);
        fName = split[1];
        mName = split[2];
        lName = split[3];
    }
}

因为您已经将文件读入数组（我想是字符串）。

String[] lines = ....;
Employee[] employees = new Employee[lines.length];
for(int i = 0; i < lines.length; i++) {
     employees[i] = new Employee(lines[i]);
}

你去......你有一系列的员工。

Answer 2

读取文件并逐行循环遍历其内容。然后解析这些行并在每次迭代中创建一个new Employee()。设置您的值，例如id和name。最后，将新的Employee实例添加到List<Employee>并继续下一个条目。

// Read data from file
try (BufferedReader br = new BufferedReader(new FileReader(file))) {

    // List to collect Employee objects
    List<Employee> employees = new ArrayList<Employee>();

    // Read file line by line
    String line = "";
    while ((line = br.readLine()) != null) {
       // Parse line to extract individual fields
       String[] data = this.parseLine(line);

       // Create new Employee object
       Employee employee = new Employee();
       employee.id = Integer.valueOf(data[0]);
       employee.fName = data[1];
       employee.mName = data[2];

       // Add object to list
       employees.add(employee);
    }

    // Further process your Employee objects...
}

此外，还有一些CSV库可以处理读取具有逗号分隔值的文件的所有令人讨厌的部分。我建议使用OpenCSV，例如。

Answer 3

这里已经发布了答案，但我还是要发帖...

package com.stackoverflow.java.test;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;

public class Employee {
public int id;
public String fName;
public String mName;

public Employee(int id, String fName, String mName) {
    this.id = id;
    this.fName = fName;
    this.mName = mName;
}


public static void main(String[] args) throws IOException {
    Employee[] e = new Employee[5];

    FileReader fr=new FileReader("YourDoc.txt");
    BufferedReader br=new BufferedReader(fr);
    String line="";
    String[] arrs=null;
    int num=0;
    while ((line=br.readLine())!=null) {
        arrs=line.split(",");

        e[num] = new Employee(Integer.valueOf(arrs[0]), arrs[1], arrs[2]);

        num++;
    }
    br.close();
    fr.close();

    for(int i=0 ; i< e.length; i++) {
        System.out.println(e[i].id + " and " + e[i].fName + " and " + e[i].mName);
    }
}

}

Answer 4

尝试：

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

    File f1 = new File("d:\\data.txt");
    Scanner scanner = new Scanner(f1);
    List<Employee1> empList=new ArrayList<>();
    while(scanner.hasNextLine()){
        String data[]=scanner.nextLine().split(",");
        empList.add(new Employee(Integer.parseInt(data[0]),data[1],data[2],data[3]));
    }
    scanner.close();
    System.out.println(empList);
}

Employee.java

 class Employee{
        public int id;
        public String fName;
        public String mName;
        public String lName;
        public int getId() {
            return id;
        }
        public void setId(int id) {
            this.id = id;
        }
        public String getfName() {
            return fName;
        }
        public void setfName(String fName) {
            this.fName = fName;
        }
        public String getmName() {
            return mName;
        }
        public void setmName(String mName) {
            this.mName = mName;
        }
        public String getlName() {
            return lName;
        }
        public void setlName(String lName) {
            this.lName = lName;
        }
        public Employee(int id, String fName, String mName, String lName) {
            super();
            this.id = id;
            this.fName = fName;
            this.mName = mName;
            this.lName = lName;
        }
        @Override
        public String toString() {
            return "Employee [id=" + id + ", fName=" + fName + ", mName="
                    + mName + ", lName=" + lName + "]";
        }

}

将文件内容读入类对象

4 个答案: