面向对象综合案例

键盘录入名字和年龄，查找对应的院系。
A 光电学院（光子，电子，光学分析）
B 计算机学院（数据结构，C语言，操作系统）
C 理学院（高等数学，线性代数，概率论）
D 管理学院（会计，管理学，经济学）

光电学院

package com.pp;

public class Dstudent extends Student {
    private String Cname="光电学院";
    String [] zn={"光子","电子","光学分析"};

    public String getCname() {
        return Cname;
    }

    public void setCname(String cname) {
        Cname = cname;
    }
}

管理学院

package com.pp;

public class Gstudent extends  Student {
    private String Cname="管理学院";
    String [] zn={"会计","管理学","经济学"};

    public String getCname() {
        return Cname;
    }

    public void setCname(String cname) {
        Cname = cname;
    }
}

计算机学院

package com.pp;

public class Jstudent extends  Student {
    private String Cname="计算机学院";
    String [] zn={"C语言","数据结构","操作系统"};

    public String getCname() {
        return Cname;
    }

    public void setCname(String cname) {
        Cname = cname;
    }
}

理学院

package com.pp;

public class Lstudent extends  Student {
    private String Cname="理学院";
    String [] zn={"高等数学","线性代数","概率论"};

    public String getCname() {
        return Cname;
    }

    public void setCname(String cname) {
        Cname = cname;
    }
}

录入数据

package com.pp;

public class Inputstudent {
    private String name;
    private int    age;
    private String Zname;

    public String getName() {
        return name;
    }

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

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public String getZname() {
        return Zname;
    }

    public void setZname(String zname) {
        Zname = zname;
    }
}

学生类

package com.pp;

public class Student {
    private String name;
    private int age;

    public String getName() {
        return name;
    }

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

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public Student compare(Inputstudent inputstudent){
        String Zname = inputstudent.getZname();
        Jstudent jstudent = new Jstudent();
        Gstudent gstudent = new Gstudent();
        Lstudent lstudent = new Lstudent();
        Dstudent dstudent = new Dstudent();

        for(int i=0;i<jstudent.zn.length;i++){
            if(Zname.equals(jstudent.zn[i])){
                return new Jstudent();
            }
        }
        for(int i=0;i<dstudent.zn.length;i++){
            if(Zname.equals(dstudent.zn[i])){
                return new Dstudent();
            }
        }
        for(int i=0;i<lstudent.zn.length;i++){
            if(Zname.equals(lstudent.zn[i])){
                return new Lstudent();
            }
        }for(int i=0;i<gstudent.zn.length;i++){
            if(Zname.equals(gstudent.zn[i])){
                return new Gstudent();
            }
        }
        return null;
    }
}

学生工具类

package com.pp;

import java.util.ArrayList;
import java.util.Scanner;

public class StudentUtil {
    private static ArrayList<Inputstudent>Data;

    public static void Scanf(){
        Data=new ArrayList<>();
        for(int i=0;i<3;i++){
            Scanner scanner = new Scanner(System.in);
            Inputstudent inputstudent = new Inputstudent();

            System.out.println("请输入姓名");
            String sname = scanner.next();
            System.out.println("请输入年龄");
            int age = scanner.nextInt();
            System.out.println("请输入专业课名称");
            String Zname = scanner.next();

            inputstudent.setAge(age);
            inputstudent.setName(sname);
            inputstudent.setZname(Zname);

            Data.add(inputstudent);
            System.out.println(Data.size());
        }
    }
    public static void RetCname(){
        for(int i=0;i<Data.size();i++){
            Inputstudent inputstudent=Data.get(i);
            Student student = new Student();
            Student compare=student.compare(inputstudent);

            if(compare instanceof Jstudent){
                Jstudent jstudent=(Jstudent)compare;
                System.out.println(jstudent.getCname());
            }else if(compare instanceof Dstudent){
                Dstudent dstudent=(Dstudent)compare;
                System.out.println(dstudent.getCname());
            }else if(compare instanceof Gstudent){
                Gstudent gstudent=(Gstudent)compare;
                System.out.println(gstudent.getCname());
            }else if(compare instanceof Lstudent){
                Lstudent lstudent=(Lstudent)compare;
                System.out.println(lstudent.getCname());
            }
        }
    }
}

测试类

package com.pp;

public class Test {
    public static void main(String[] args) {

        StudentUtil.Scanf();
        StudentUtil.RetCname();
    }
}

运行结果

请输入姓名
张三
请输入年龄
11
请输入专业课名称
数据结构
1
请输入姓名
李四
请输入年龄
22
请输入专业课名称
会计
2
请输入姓名
王五
请输入年龄
33
请输入专业课名称
光子
3
计算机学院
管理学院
光电学院

Process finished with exit code 0