1. JAVA 2 - Class (클래스) 예제 및 연습문제

I. 예제

1) CellphoneTest

public class CellphoneTest {

	public static void main(String[] args) {
		// 나의 의식 
		Cellphone cp1 = new Cellphone ();
		cp1.maker = "Apple";
		cp1.model = "14pro";
		cp1.color = "deep purple";
		cp1.price = 170;
		
		System.out.println(cp1.maker);	
		System.out.println(cp1.model);
		System.out.println(cp1.color);
		System.out.println(cp1.price);
		
		cp1.call();
		cp1.camera();

// field 값 변경하기

		cp1.color = "light pink";
		cp1.model = "14";
		System.out.println(cp1.maker);	
		System.out.println(cp1.model);
	}

}

2) Cellphone

// 설계도
public class Cellphone {
	
	// 속성: member 변수 또는 field - 명사로 짓는 편
	String maker;
	String model;
	String color;
	int price;
	
	// 기능: method
	public void call() {
		System.out.println("여보세요");
	}
	
	public void camera() {
		System.out.println("찰칵");
	}
}

II. 연습문제

1) PersonTest

public class PersonTest {
	public static void main(String[] args) {
		Person p1 = new Person ();
        
		p1.name = "Stella";
		p1.bday = "19960923";
		p1.gender = "Female";
			
		p1.sayhi();
		p1.walk();
		p1.introduce();
		p1.printAge();
	}
}

2) Person

public class Person {
// 속성: 멤버 변수 또는 field
	String name;
	String bday;
	String gender;

// 기능: method
	public void sayhi () {
		System.out.println("안녕하세요~~ ");
	}
	public void walk () {
		System.out.println("걷기 ");
	}
	public void introduce () {
		System.out.println("내 이름은 " + this.name + "이고 성별은 " + this.gender);
	}
	public void printAge () {
		int year = Integer.parseInt(bday.substring(0, 4));
		int age = 2023 - year + 1;
		
		System.out.println("나이는 " + age + "입니다 " );
	}
}