打印出数组列表中的所有对象

• Z时代
• 2024-01-10
• 分类：问答

我需要能够在数组列表中打印出Student对象（所有变量）。这可能吗？当我尝试打印时，它会输出此类内容student.Student@82701e。我认为是hexadecimal这样

这是我的代码：

package student;
public class Student {
    private String studentName;
    private String studentNo;
    private String email;
    private int year;
    public Student() {
        this.studentName = null;
        this.studentNo = null;
        this.email = null;
        this.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) {
        this.studentName = newStudentName;
    }
    public void setStudentNo(String newStudentNo) {
        this.studentNo = newStudentNo;
    }
    public void setEmail(String newEmail) {
        this.email = newEmail;
    }
    public void setYear(int newYear) {
        this.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.List;
import java.util.Scanner;
public class studentTest {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        List<Student> Students = new ArrayList();
        Student student1 = new Student();
        student1.setStudentName("Bob Marley");
        student1.setStudentNo("N0002");
        student1.setEmail("student2@student.com");
        student1.setYear(2);
        Students.add(student1);
        Student student2 = new Student();
        student2.setStudentName("Bill Harvey");
        student2.setStudentNo("N0003");
        student2.setEmail("student3@student.com");
        student2.setYear(2);
        Students.add(student2);
        Student student3 = new Student();
        student3.setStudentName("John Beans");
        student3.setStudentNo("N0004");
        student3.setEmail("student4@student.com");
        student3.setYear(2);
        Students.add(student3);
        System.out.println("Add new students: ");
        System.out.println("Enter number of students to add: ");
        int countStudents = input.nextInt();
        for (int i = 0; i < countStudents; i++) {
            Student newStudents = new Student();
            System.out.println("Enter details for student: " + (i + 1));
            System.out.println("Enter name: ");
            newStudents.setStudentName(input.next());
            System.out.println("Enter Number: ");
            newStudents.setStudentNo(input.next());System.out.println("Search by student number: ");
            System.out.println("Enter email: ");
            newStudents.setEmail(input.next());
            System.out.println("Enter year: ");
            newStudents.setYear(input.nextInt());
            Students.add(newStudents);
        }
    }
}

回答：

类中的重写toString()方法Student如下：

   @Override
   public String toString() {
        return ("StudentName:"+this.getStudentName()+
                    " Student No: "+ this.getStudentNo() +
                    " Email: "+ this.getEmail() +
                    " Year : " + this.getYear());
   }

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