从文件中读取对象并将它们输出到一行中，输出到另一个文件

问：

目前，我有一个对象数组，我将其写入 .ser 文件。现在我想做的是让个人只出现在另一个文件中一次，并将他们的所有数字加起来。到目前为止，我用函数中的更新编号编写了每一行，但不确定如何让它们只出现一次，所有数字加起来。

这是我的代码：

公共类 IOStream {

/**
 * @param args the command line arguments
 */
public static void main(String[] args) throws ClassNotFoundException {

    Person[] people = new Person[14];
    people[0] = new Professor("Professor", "Issac", "Newton", "Physcis", 6);
    people[1] = new TA("TA", "Marie", "Curie", "Physics", 6);
    people[2] = new Professor("Professor", "Issac", "Newton", "Calculus", 4);
    people[3] = new Student("Student", "Amy", "Adams", "Calculus", 4);
    people[4] = new Student("Student", "Will", "Smith", "Calculus", 4);
    people[5] = new Student("Student", "Brad", "Pitt", "Physics", 6);
    people[6] = new Student("Student", "Will", "Smith", "Physics", 6);
    people[7] = new Professor("Professor", "Dimitri", "Mendeleev", "Chemistry", 6);
    people[8] = new TA("TA", "Carl", "Gauss", "Calculus", 4);
    people[9] = new Student("Student", "Amy", "Adams", "Economics", 3);
    people[10] = new Professor("Professor", "Adam", "Smith", "Economics", 3);
    people[11] = new TA("TA", "Marie", "Curie", "Chemistry", 6);
    people[12] = new Student("Student", "Brad", "Pitt", "Chemistry", 6);
    people[13] = new Student("Student", "Will", "Smith", "Chemistry", 6);

    //WRITING
    try ( ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream("object.ser"))) {
        for (int i = 0; i < people.length; i++) {
            out.writeObject(people[i]);
        }
        out.close();
    } catch (IOException e) {
        e.printStackTrace();
    }

    //READING INPUT
    try ( ObjectInputStream in = new ObjectInputStream(new FileInputStream("object.ser"))) {
        ObjectOutputStream writer = new ObjectOutputStream(new FileOutputStream("output.ser"));
        Person lol;
        Person [] list;
        int i;
        while ((lol = (Person) in.readObject()) != null) {
            
           writer.writeObject(lol.title + " " + lol.fName + " " + lol.lName + " " + lol.getParticipatingHours(lol.courseHours));
            
        }
    } catch (EOFException i) {
        //System.out.println("lol");
    } catch (IOException e) {
        e.printStackTrace();
        System.out.println("Error");
    }       
    try {
        ObjectInputStream reader = new ObjectInputStream(new FileInputStream("output.ser"));
        Object line;
        while ((line = reader.readObject()) != null) {
            System.out.println(line);
        }
    } catch (EOFException i) {
        //System.out.println("lol");
    } catch (IOException e) {
        e.printStackTrace();
    }
   

}

}

这是我从输出文件中读取的输出： 跑： 伊萨克·牛顿教授 4 TA 居里夫人 2 伊萨克·牛顿教授 3 学生 艾米·亚当斯 4 学生威尔·史密斯 4 学生布拉德·皮特（Brad Pitt） 6 学生威尔·史密斯 6 迪米特里·门捷列夫教授 4 TA 卡尔·高斯 1 学生艾米·亚当斯（Amy Adams） 3 亚当·斯密教授 2 TA 居里夫人 2 学生布拉德·皮特（Brad Pitt） 6 学生威尔·史密斯 6