초롱스쿨

import java.util.Scanner;

public class Mymain {

    public static void main(String[] args) {

        Scanner sc =new Scanner(System.in);

        Memory mem;                            //객체 생성

        MyStack ms = new MyStack();            //스택으로 객체 생성

        MyQueue mq = new MyQueue();            //큐로 객체 생성

        int index = 0, index1=0;

        while (true) {                        //반복

            System.out.println("1.stack 2.queue");

            index = sc.nextInt();            

            if(index == 1) {                //스택 사용 시 객체 스택으로 동적바인딩0

                mem = ms;

            }else if(index == 2) mem = mq;                    //큐 사용시 큐로 동적바인딩

            else break;

            while(true) {

                System.out.println("1.push   2.pop");

                index1 = sc.nextInt();

                if(index1 == 1) {                //푸쉬

                    mem.push(sc.nextInt());        //입력값 넘김

                }else if(index1 == 2) {            //팝

                    System.out.println(mem.pop());

                }else break;

            }

        }

    }

}

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public class A extends Object {

    private String name;

    public A() {

        System.out.println("A");

    }

    public A(String name) {

        this.name = name;

    }

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

}

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public class B extends A{

    private int age;

    public B() {

        super();    

        //부모의 생성자 호출 -> 자식 클래스의 첫번째 생성자에서 호출하도록 되어있다. 명시적으로 쓸 경우 default 없음

        System.out.println("B");

    }

    public B(String name, int age) {

        super(name);    

        this.age = age;

    }

    public int getAge() {

        return age;

    }

    public void setAge(int age) {

        this.age = age;

    }

    public String toString() {                            //@Override

        return getName()+getAge();        //재귀호출 -> 무한 루프 그렇기 때문에 멈출 수 있는 거 필요

    }

    public static void main(String[] args) {

        B bb = new B("superman",1000);

        System.out.println(bb);                            //bb = bb.toString 

    }

}

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import java.util.Scanner;

public class ArrayHasA {

    StudentScore []student;                            //StudentScore 클래스를 배열로 받아옴

    int index;                                        //입력한 학생 인원 수 받음

    ArrayHasA(int index) {                            //생성자 : 인덱스로 받음

        student=new StudentScore[index];            //

        this.index = index;

        loading();

    }

    void loading() {                                

        for(int i = 0; i <student.length;i++) {

            student[i]=new StudentScore();        //생성자 부르자 마자 인덱스 값으로 StudentSccore 객체 생성

            student[i].setInput();                //학생 정보 입력

            student[i].getAvg();                //평균 구하기

        }

    }

    void setStudent(StudentScore []ae) {

        this.student = ae;

    }

    void setIndex(int index) {

        this.index = index;

    }

    StudentScore[] getStudent() {

        return this.student;

    }

    int getIndex() {

        return this.index;

    }

    void printer(){//출력하기 위한 메소드

        for (int i = 0; i < student.length; i++) {                    //student index 크기만큼 돌림

            System.out.print(student[i].name +"\t");            

            for (int j = 0; j < student[i].score.length; j++) {        //StudentScore 의 인덱스 크기만큼 돌림

                System.out.print(student[i].score[j]+"\t");

            }

            System.out.print(student[i].avg);

            System.out.println();

        }    

    }

    public static void main(String[] args) {

        // TODO Auto-generated method stub

        Scanner sc = new Scanner(System.in);

        System.out.println("몇명의 학생 정보를 입력하시겠습니까? ");

        ArrayHasA ah = new ArrayHasA(sc.nextInt());        //입력할 학생 정보 scanner로 받음

        System.out.println("-------------성적 출력---------------");        

        ah.printer();                                    //성적 출력 메소드 활용

    }

}

class StudentScore {

    String name;                    //이름

    int []score;                    //점수(국어, 영어, 수학, 총점)

    float avg;                        //평균

    StudentScore(){                    //생성자

        score=new int[4];            

    }

    StudentScore(String name, int []score, float avg){

        this.score = score;            //초기화

        this.name = name;            //이름

        this.avg = avg;                //평균

    }

    public void setName(String name) {

        this.name = name;

    }

    public void setScore(int[] arr) {

        this.score=arr;

    }

    public void setAvg(float avg) {

        this.avg = avg;

    }

    public String getName() {

        return this.name;

    }

    public int[] getScore() {

        return this.score;

    }

    public float getAvg() {                //float 형태로 평균 구함

        this.avg = (float)score[3]/3;

        return avg;

    }

    void setInput() {                        //사용자 이름과 성적 입력 메소드

        Scanner sc = new Scanner(System.in);

        System.out.print("이름을 입력하세요 : ");

        this.name = sc.next();

        System.out.println("성적을 입력하세요 (국어, 수학, 영어 성적 순):");

        score[3]=0;

        for(int i = 0; i < score.length-1;i++) {        //for 반복하여 숫자 입력

            this.score[i]= sc.nextInt();

            this.score[3] += score[i];

        }

    }

}

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