java - 打印哈希码来代替数组元素

Question

我创建了一个程序，其中有一个名为 Student 的新类，它设置和获取不同的变量，例如姓名、GPA、是否已注册以及何时注册(这是一个字符串，它的目的是)。问题是，当我尝试将信息存储到数组和/或数组列表中并打印它时，我得到的是打印的哈希代码而不是信息。该程序并不完全完整，但我试图首先解决哈希码问题。如果您能提供帮助，我将不胜感激。预先感谢您!

    Student st = new Student();


    System.out.println(st.getName());
    Student1();
    Student st1 = new Student("John");

}

public static void Student1() {

    System.out.println("Enter the data for student 1 :");
    Student st = new Student();
    Scanner keyboard = new Scanner(System.in);

    String name = keyboard.next();
    double GPA = keyboard.nextDouble();
    boolean enrolled = keyboard.nextBoolean();
    String date = keyboard.next();
     for (int i =0; i<5; i++){
    Student newStudent = new Student();
    newStudent.setName(name);
    newStudent.setGPA(GPA);
    newStudent.setEnrolled(enrolled);
    newStudent.setDate(date);
    ArrayList <Student> strList = new ArrayList<Student>();
    Student student[] = new Student[5];
    newStudent.getName();
    student[i] = newStudent;

    strList.add(newStudent);
    System.out.println(student[i]);

}

学生类

公开课学生{

private String name;
private double gpa;
private boolean enrolled;
private String enrollDate;

public Student() {

    this.name = "";
    this.gpa = 0.0;
    this.enrolled = false;
    this.enrollDate = "none";

}

public Student(String name1) {
    this.name = name1;
    this.gpa = 0.0;
    this.enrolled = false;
    this.enrollDate = "none";
}

public void setName(String name) {
    this.name = name;
}

public String getName() {
    return this.name;
}

public void setGPA(double gpa) {
    this.gpa = gpa;
}

public double getGPA() {
    return this.gpa;
}

public void setEnrolled(boolean enrolled) {
    this.enrolled = enrolled;


}

public boolean getEnrolled() {
    return this.enrolled;
}

public void setDate(String date) {
}

}

Answer 1

这是因为您要将一个学生对象放入数组中:

Student student[] = new Student[5];
newStudent.getName();
student[i] = newStudent;

strList.add(newStudent);
System.out.println(student[i]);

在这里，当您打印时，您不是打印学生姓名，而是打印对象本身。每当您对对象执行 System.out.println 时，都会返回哈希码。

这是你的问题吗？