[명품JAVA프로그래밍] 4장 실습문제 11번

import java.util.Scanner;

class Add{
	private int a,b;
	
	void setValue(int a, int b) {
		this.a = a;
		this.b = b;
	}
	
	public int calculate() {
		return a+b;
	}
}

class Sub{
	private int a,b;

	void setValue(int a, int b) {
		this.a = a;
		this.b = b;
	}
	
	public int calculate() {
		return a-b;
	}
}

class Mul{
	private int a,b;
	
	void setValue(int a, int b) {
		this.a = a;
		this.b = b;
	}
	
	public int calculate() {
		return a*b;
	}
}

class Div{
	private int a,b;
	
	void setValue(int a, int b) {
		this.a = a;
		this.b = b;
	}
	
	public int calculate() {
		return a/b;
	}
}

public class ex11 {
	
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		System.out.print("두 정수와 연산자를 입력하시오>>");
		int a = sc.nextInt();
		int b = sc.nextInt();
		String op = sc.next();
		
		switch(op) {
		case "+":
			 Add add = new Add();
			 add.setValue(a, b);
			 System.out.println(add.calculate());
			 break;
		case "-":
			 Sub sub = new Sub();
			 sub.setValue(a, b);
			 System.out.println(sub.calculate());
			 break;		
		case "*":
			 Mul mul = new Mul();
			 mul.setValue(a, b);
			 System.out.println(mul.calculate());
			 break;		
		case "/":
			 Div div = new Div();
			 div.setValue(a, b);
			 System.out.println(div.calculate());
			 break;		
		}
		sc.close();
	}

}

결과

두 정수와 연산자를 입력하시오>>1 2 *
2