java 스터디 - Class Review

Level1
1) 사각형 만들기

public class Square {
    int width;
    int height;
    public Square(int width, int height) {
        this.width = width;
        this.height = height;
    }
    public int getWidth() {
        return this.width;
    }
    public int getHeight() {
        return this.height;
    }
    public int calculateArea() {
        return width*height;
    }
}

2) 원 만들기

public class Circle {
    int radius;
    public Circle(int radius) {
        this.radius = radius;
    }
    public int getRadius() {
        return this.radius;
    }
    public double calculateArea() {
        return 3.14*radius*radius;
    }
}

3) 아이유 프로필 출력하기

class Person {
    String name;
    int age;
    boolean student;
    double weight;

    Person(String name, int age, boolean student, double weight) {
        this.name = name;
        this.age = age;
        if (student) {
            this.student = true;
        } else {
            this.student = false;
        }
        this.weight = weight;
    }

    void printProfile() {
        System.out.println("이름 : " + name);
        System.out.println("나이 : " + age);
        System.out.println("대학생인가요? : " + student);
        System.out.println("몸무게 : " + weight);
    }
}

4) 학생들의 국어, 영어 점수 출력하기

import java.util.*;
class Student {

    String name = "";
    int KoreanScore = 0;
    int EnglishScore = 0;

    Student(String name, int Korean, int English) {
        this.name = name;
        this.KoreanScore = Korean;
        this.EnglishScore = English;}
    String getName() {
        return this.name;}
    int getKoreanScore() {
        return this.KoreanScore;}

    int getEnglishScore() {
        return this.EnglishScore;}
}
public class Score {

    public static void main(String[] args) {
        List<Student> students = new ArrayList<Student>();

        students.add(new Student("제이슨", 87, 92));
        students.add(new Student("레이첼", 82, 92));
        students.add(new Student("리사", 92, 88));

        for (int i = 0; i < students.size(); i++) {
            System.out.println("이름 : " + students.get(i).getName());
            System.out.println("국어 : " + students.get(i).getKoreanScore());
            System.out.println("영어 : " + students.get(i).getEnglishScore());
        }
    }
}

5) 계좌 만들기

class Account {
    String number;
    String name;
    double balance;
    public Account(){
        this.balance=0;
    }
    public Account(String number, String name) {
        this.number = number;
        this.name = name;
    }
    public String getAccountNumber() {
        return number;
    }
    public void deposit(int amount) {
        balance += amount;
    }
    public void withdraw(int amount) {
        balance -= amount;
    }
    public double getBalance() {
        return balance;
    }
}

6) 아이유 프로필 출력하기2

class Person {
    String name;
    int age;
    boolean student;
    double weight;

    Person(String name, int age, boolean student, double weight) {
        this.name = name;
        this.age = age;
        if (student) {
            this.student = true;
        } else {
            this.student = false;
        }
        this.weight = weight;
    }
    Person(String name, String age, boolean student, String weight) {
        this.name = name;
        this.age = Integer.parseInt(age);
        if (student) {
            this.student = true;
        } else {
            this.student = false;
        }
        this.weight = Double.parseDouble(weight);
    }
    Person(String name, int age, boolean student, String weight) {
        this.name = name;
        this.age = age;
        if (student) {
            this.student = true;
        } else {
            this.student = false;
        }
        this.weight = Double.parseDouble(weight);
    }
    Person(String name, String age, boolean student, double weight) {
        this.name = name;
        this.age = Integer.parseInt(age);
        if (student) {
            this.student = true;
        } else {
            this.student = false;
        }
        this.weight = weight;
    }
    void printProfile() {
        System.out.println("이름 : " + name);
        System.out.println("나이 : " + age);
        System.out.println("대학생인가요? : " + student);
        System.out.println("몸무게 : " + weight);
        System.out.println("");
    }
}

7) 계산기 만들기

class Calculator {
    String name;
    Calculator(String name){
        this.name = name;}
    String getOwner() {
        return this.name;}
    int add(int a, int b) {
        return a + b;}
    int minus(int a, int b) {
        return a - b;}
    int multiply(int a, int b) {
        return a * b;}

    double divide(double a, double b) {
        return a / b;}

    double divide(String a, String b){
        return Double.parseDouble(a) / Double.parseDouble(b);}
}

Class의 의의는 이해한 것 같지만 논리적으로 연결되는 큰 흐름을 파악하는데 아직 많은 시간이 들어서 확신을 가지고 코드를 구현하지 못했다. 다음주에는 아직 듣지 못한 유데미 강의와 자바의 정석으로 다시 공부해서 스터디에서 배운 개념들의 전체적인 틀을 잡아야겠다.