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[Java] 계산기 실습

September 16, 2020

🌟Java 계산기 실습

🎯기본형

class Calculator_class{
    int left, right;
    int total = 0;

    public void setOperands(int left, int right){
        this.left = left;
        this.right = right;
    }

    public int sum(){
        total = this.left + this.right;
        return total;
    }
    
    public int sub(){
        total = this.left - this.right;
        return total;
    }

    public int mul(){
        total = this.left * this.right;
        return total;
    }
    
    public int div(){
        total = this.left / this.right;
        return total;
    }
}

public class Calculator{
    public static void main(String[] args) {
        Calculator_class cal = new Calculator_class();
        cal.setOperands(25,10);
        System.out.println(cal.sum());
        System.out.println(cal.sub());
        System.out.println(cal.mul());
        System.out.println(cal.div());
    }
}

🎯초기화 수정버전

class Calculator_class{
    int left, right;
    int total = 0;

    //
    public Calculator_class(int left, int right){
        this.left = left;
        this.right = right;
    }
    public int sum(){
        total = this.left + this.right;
        return total;
    }
    
    public int sub(){
        total = this.left - this.right;
        return total;
    }

    public int mul(){
        total = this.left * this.right;
        return total;
    }
    
    public int div(){
        total = this.left / this.right;
        return total;
    }
}
public class Calculator{
    public static void main(String[] args) {
        Calculator_class cal = new Calculator_class(25,10);
        System.out.println(cal.sum());
        System.out.println(cal.sub());
        System.out.println(cal.mul());
        System.out.println(cal.div());
    }
}

🎯상속 버전

class Calculator_set{
    int left, right;
    int total = 0;

    public void setOperands(int left, int right){
        this.left = left;
        this.right = right;
    }
}
class Calculator_func extends Calculator_set{
    public int sum(){
        total = this.left + this.right;
        return total;
    }
    
    public int sub(){
        total = this.left - this.right;
        return total;
    }

    public int mul(){
        total = this.left * this.right;
        return total;
    }
    
    public int div(){
        total = this.left / this.right;
        return total;
    } 
}
    

public class Calculator {
    public static void main(String[] args) {
        Calculator_func cal = new Calculator_func();
        cal.setOperands(25,10);
        System.out.println(cal.sum());
        System.out.println(cal.sub());
        System.out.println(cal.mul());
        System.out.println(cal.div());
    }
}
Written by@이주형
平常心

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