java - 将主类值存储在子类中作为数组

Question

请帮我在 Student 类中添加数组。我将在主类中输入需要存储在学生类中的值，然后可以通过调用方法ShowData()来显示。

import java.util.Scanner;

公共(public)类库{

public static void main(String[] args) {
    Student record = new Student();
    int roll;
    String name;
    int mob;
    int i;

    Scanner sc = new Scanner(System.in);

    System.out.println("Enter roll numer of student \n");
    roll = sc.nextInt();
    System.out.println("Enter name of the student \n");
    name = sc.next();
    System.out.println("Enter mobile number of the student \n");
    mob = sc.nextInt();

    record.getData(roll, name, mob);

record.showData();
}
}

这是一个学生子类

公开课学生{

int roll;
String name;
int mob;
int i = 0;

void getData(int roll, String name, int mob) {

    this.roll = roll;
    this.name = name;
    this.mob = mob;

}

void showData() {

    //for(i=0; i < 3; i++)

    System.out.println("roll number " + roll + "\nname " +  name + "\nmobile number " + mob);
}
}

Answer 1

你必须将子类继承到主类..继承是使一个类能够获取另一个类的属性(方法和变量)的过程。继承另一个类的属性的类称为子类(也称为派生类)。其中继承属性的类是父类(super class)(基类或父类)示例:

class Ajay extends Jay{
//
}

这里

• Ajay 是主类..

• Jay 是子类..

对于您的代码:

import java.util.Scanner;
public class Library extends Student{
public static void main(String[] args) {
    Student record = new Student();
    int roll;
    String name;
    int mob;
    int i;

    Scanner sc = new Scanner(System.in);

    System.out.println("Enter roll numer of student \n");
    roll = sc.nextInt();
    System.out.println("Enter name of the student \n");
    name = sc.next();
    System.out.println("Enter mobile number of the student \n");
    mob = sc.nextInt();

    record.getData(roll, name, mob);

record.showData();
}
}
public class Student
{
 int roll;
String name;
int mob;
int i = 0;

void getData(int roll, String name, int mob) {

    this.roll = roll;
    this.name = name;
    this.mob = mob;

}

void showData() {

    //for(i=0; i < 3; i++)
System.out.println("roll number " + roll + "\nname " +  name + "\nmobile number " + mob);
}
}

请立即查看..并投票给我。!