java 继承编程题

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1）定义一个学生类，包括属性：学号（ID），姓名（name），成绩（score）；构造方法（带三个参数）；每个属性的访问器方法。

import java.util.Scanner;
class Student {
   String ID = " ";
   String name = " ";
   float Score = 0.0f;
   Student (String ID, String name, float Score) {
       this.ID = ID;
       this.name = name;
       this.Score = Score;
   }
   public String getID () {
       return ID;
   }
   public String getName () {
       return name;
   }
   public float getScore () {
       return Score;
   }
}
public class Test_1 {
   public static void main (String[] args) {
       Scanner sc = new Scanner(System.in);
       System.out.println("请输入学号：");
       String ID = sc.nextLine();
       System.out.println("请输入姓名：");
       String name = sc.nextLine();
       System.out.println("请输入成绩：");
       float Score = sc.nextFloat();
       Student a = new Student("3203", "张三", 100);
       System.out.println("学号：" + a.getID());
       System.out.println("姓名：" + a.getName());
       System.out.println("成绩：" + a.getScore());
   }
}

2）创建类A1，实现构造方法中输出This is A;创建A1的子类B1，实现构造方法中输出This is B;创建B1的子类C1，实现构造方法中输出This is C。

class A1 {
   A1 () {
       System.out.println("This is A!");
   }
   A1 (int i) {
   }
}
class B1 extends A1 {
   B1 () {
       super(1);
       System.out.println("This is B!");
   }
   B1 (int i) {
       super(1);
   }
}
class C1 extends B1 {
   C1 () {
       super(1);
       System.out.println("This is C!");
   }
}
public class Test_2{
   public static void main (String[] args) {
       A1 a = new A1();
       B1 b = new B1();
       C1 c = new C1();
   }
}

3）定义一个人类（Person），它包含属性：姓名（name）,性别（sex）;带两个参数的构造方法；属性的访问器方法。定义上面人类的子类学生类（Student），包括属性：学号（ID），带参数的构造方法；属性的访问器方法。

class Person {
   String Name = null;
   String Sex = null;
   Person (String Name, String Sex) {
       this.Name = Name;
       this.Sex = Sex;
   }
   public String getName () {
       return Name;
   }
   public String getSex () {
       return Sex;
   }
}
class Student extends Person {
   String ID = null;
   Student (String ID) {
       super("张三", "男");
       this.ID = ID;
   }
   public String getID () {
       return ID;
   }
}
public class Test_3 {
   public static void main (String[] args) {
       Person p = new Person("李四", "男");
       Student s = new Student("511502");
       System.out.println("姓名：" + p.getName() + "\n" + "性别：" + p.getSex());
       System.out.println("姓名：" + s.getName() + "\n" + "性别：" + s.getSex() + "\n" + "学号：" + s.getID());
   }
}

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