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java将学生添加到数组中

我已经想出了如何从用户那里收集数据,以便在我的数组中创建一个新的学生,但我在将这些信息添加到数组中时遇到了困难。请告诉我如何在给定代码中添加此数据作为新的学生对象。请参考AddStudent方法

import java.util.Scanner;

public class ArrayDemo {

    static Student[] students;

    private static void ViewStudents() {

        for (int i = 0; i < students.length; i++) {
            System.out.println(i + ") " + students[i].getLName() + ", " + students[i].getFName());
        }
    }

    private static void ViewDetails() {
        Scanner kb = new Scanner(System.in);

        int i;
        System.out.println("Who would you like to view?");
        ViewStudents();
        i = Integer.parseInt(kb.nextLine());
        System.out.println("ANum:\t\t" + students[i].getANum());
        System.out.println("\nAddress:\t" + students[i].address.getHouseNum() + " " + students[i].address.getStreet());
        System.out.println("\t\t" + students[i].address.getCity() + ", " + students[i].address.getState() + " " + students[i].address.getZip());
        System.out.println("\t\t" + students[i].address.getLine2());
    }

    private static void AddStudent() {
        Scanner kb = new Scanner(System.in);

        Student student = new Student();

        String FirstName;
        String LastName;
        int HouseNum;
        String Street;
        String City;
        String State;
        int Zip;
        String Line2;

        System.out.println("\tInput Information");
        System.out.println("\tFirst Name:");
        FirstName = kb.nextLine();
        System.out.println("\tLast Name:");
        LastName = kb.nextLine();
        System.out.println("\tHouse Number:");
        HouseNum = Integer.parseInt(kb.nextLine());
        System.out.println("\tStreet:");
        Street = kb.nextLine();
        System.out.println("\tCity:");
        City = kb.nextLine();
        System.out.println("\tState:");
        State = kb.nextLine();
        System.out.println("\tZip Code:");
        Zip = Integer.parseInt(kb.nextLine());
        System.out.println("\tExtra Information:");
        Line2 = kb.nextLine();

        System.out.println("\nStudent:\t" + LastName + ", " + FirstName);
        System.out.println("ANum:\t\t" + student.getANum());
        System.out.println("Address:\t" + HouseNum + " " + Street);
        System.out.println("\t\t" + City + ", " + State + " " + Zip);
        System.out.println("\t\t" + Line2);

        //students.setAddress( HouseNum, Street, City, State, Zip, Line2 );
        System.out.println("\tYour Student was Successfully Added");
    }

    private static void RemoveStudent() {
        Scanner kb = new Scanner(System.in);
        System.out.println("Who would you like to remove?");
        ViewStudents();

        for (int j = Integer.parseInt(kb.nextLine()); j < students.length - 1; j++) {
            students[j] = students[j + 1];
        }

        students[students.length - 1] = null;
    }

    public static void main(String[] args) {
        Scanner kb = new Scanner(System.in);

        int x = 40;
        //students = new Student[0];
        students = new Student[2];

        students[0] = new Student("Thomas", "Emily");
        students[1] = new Student("Bob", "Joe");
        students[0].address = new Address(6614, "White Sands ln", "Hixson", "Tennessee", 37343, "");
        students[1].address = new Address(66, "White  ln", "Hson", "Tealamabaee", 373873, "");

        do {
            System.out.println();
            System.out.println("Do you want to:");
            System.out.println("\t0) View Students");
            System.out.println("\t1) View Students' Details");
            System.out.println("\t2) Add a Student");
            System.out.println("\t3) Remove a Student");
            System.out.println("\t4) Exit");
            x = Integer.parseInt(kb.nextLine());

            switch (x) {

                case 0:
                    ViewStudents();
                    break;
                case 1:
                    ViewDetails();
                    break;
                case 2:
                    AddStudent();
                    break;
                case 3:
                    RemoveStudent();
                    break;
                case 4:

                    break;
                default:
            }
        } while (x != 4);
    }
}

共 (1) 个答案

  1. # 1 楼答案

    从我看来,你使用了错误的数据结构。你似乎知道,添加动态数量的StudentArrayListArray好得多,也更合适。然后你可以简单地使用add方法

    记住,一个Array的大小是不变的(它不能改变),所以在这种情况下,你想要的肯定是某种List,可能是ArrayList

    如果坚持使用数组,则需要跟踪学生已经添加的数量,并将其用作索引(作为全局变量或作为参数传递)。但是要记住Array的性质意味着你会很快达到上限,除非你设置了非常高的容量