Question

我正在尝试制作一个简单的程序，演示如何使用对象的ArrayLists。我希望能够输入要存储在对象中的细节以及搜索和打印对象。

我正在学习这项课程我已经完成了我的学生课程，并且我已经开始了我的studentTest课程，但我正在寻找输入的帮助。

这是我到目前为止所做的：

package student;

public class Student {

    private String studentName;
    private String studentNo;
    private String email;
    private int year;

    public Student() {
      /**studentName = null;
        *studentNo = null;
        *email = null;
        *year = -1;
        */
    }

    public Student(String nName, String nNum, String nEmail, int nYr) {
        this.studentName = nName;
        this.studentNo = nNum;
        this.email = nEmail;
        this.year = nYr;
    }

    public void setStudentName(String newStudentName) {
        studentName = newStudentName;
    }

    public void setStudentNo(String newStudentNo) {
        studentNo = newStudentNo;
    }

    public void setEmail(String newEmail) {
        email = newEmail;
    }

    public void setYear(int newYear) {
        year = newYear;
    }

    public String getStudentName() {
        return studentName;
    }

    public String getStudentNo() {
        return studentNo;
    }

    public String getEmail() {
        return email;
    }

    public int getYear() {
        return year;
    }


    }
}

package student;
import java.util.ArrayList;
import java.util.Scanner;

public class studentTest {

    public static void main(String[] args) {

        Scanner input = new Scanner(System.in);

        Student student1 = new Student();
        Student student2 = new Student();
        Student student3 = new Student();
        Student student4 = new Student();
        Student student5 = new Student();


    }
}

Answer 1

查看Scanner的文档。

从目前为止在studentTest中完成的代码看来，您正在接受用户的所有输入。

您基本上需要在循环中输入所有数据：

// create ArrayList
for (int i=0; i < 5; i++) {
   String studentName = input.nextLine();
   ....

   Student student = new Student();
   student.setStudentName();
   ...

   // add student to arraylist
}

我认为你将从填补我遗漏的内容中受益。

Answer 2

我认为他只想填写学生班像这样的东西。

 while(true){
    Scanner input = new Scanner(System.in);

    Student student1 = new Student();
    int year= input.nextInt();
    String studentName=input.nextLine();
    studentNo=input.nextLine();
    String email=input.nextLine();

    student1.setStudentName(studentName);
    student1.setStudentNo(studentNo);
    student1.setEmail(email);
    student1.setYear(year) 

    int year= input.nextInt();
    String studentName=input.nextLine();
    studentNo=input.nextLine();
    String email=input.nextLine();



      break; // at the last position
      }

Answer 3

您可能需要更新主要方法，如下所示：

public static void main(String[] args) {
    List<Student> students = new ArrayList<Student>();
    Scanner input = new Scanner(System.in);

    System.out.println("Enter number of students");
    int countStudents = input.nextInt();

    for(int i=0; i< countStudents; i++){
          Student student = new Student();
          System.out.println("Enter details for student"+i);

          System.out.println("Enter name");
          student.setStudentName(input.next()); 

          System.out.println("Enter Number");
          student.setStudentNo(input.next()); 

          System.out.println("Enter email");
          student.setEmail(input.next()); 

          System.out.println("Enter year");
          student.setYear(input.nextInt()); 
          students.add(student);
    }
    //Your list of students is populated now
}

简单的Java程序Arraylist

3 个答案: