java - 如何打印类字段的值以及父类字段的值？

Question

这是我 child 的类(class)。我想用 toString 方法打印字段的值。任何人都可以帮助我如何打印子类字段以及父类字段

public class Student extends StudentAddress {

    private String studentName;
    private String courseName;


    public Student(
            String address1,
            String address2,
            int mob,
            String studentName,
            String courseName) {
        super(address1, address2, mob);
        this.studentName = studentName;
        this.courseName = courseName;
    }

    public void display(Student s){
        System.out.println(s.toString());
    }

    public static void main(String[] args) {
        Student student = new Student("add1","add2",122,"Abc","MMC");
        System.out.println(student);
        student.display(student);
    }


    @Override
    public String toString() {
        return "Student{" +
                "studentName='" + studentName + '\'' +
                ", courseName='" + courseName + '\'' +
                '}';
    }
}

这是父类。

public class StudentAddress {

    private String address1;
    private String address2;
    private int mob;

    public StudentAddress(String address1, String address2, int mob) {
        this.address1 = address1;
        this.address2 = address2;
        this.mob = mob;
    }

    @Override
    public String toString() {
        return "StudentAddress{" +
                "address1='" + address1 + '\'' +
                ", address2='" + address2 + '\'' +
                ", mob=" + mob +
                '}';
    }
}

我想打印所有 5 个字段的值；

Answer 1

在Student中，使用super.toString()

public String toString() {
    return "Student{" +
            "studentName='" + studentName + '\'' +
            ", courseName='" + courseName + '\'' +
            '}'+super.toString();
}

当然，我不知道您想要如何格式化输出，因此请根据需要进行必要的更改。