[JAVA] 오버로딩 (overloading)

오버로딩 (overloadind) : 클래스에 메소드를 정의할 때 이름이 같지만 서로 다른 매개변수 형식을 지닌 메소드를 여러 개 정의할 수 있는 방법

• 메소드 이름과 반환값 같아야함
• 매개변수 달라야함

class Calculator {
    int left,right;
    int third = 0;

    public void setCalculator(int left,int right){
        System.out.println("setCalculator(int left,int right)");
        this.left = left;
        this.right = right;
    }

    public void setCalculator(int left,int right,int third){ //오버로딩
        System.out.println("setCalculator(int left,int right,int third)");
        this.left = left;
        this.right = right;
        this.third = third;
    }

    public void sum(){ //더하기
        System.out.println(this.left + this.right + this.third);
    }

    public void avg(){ //평균
        System.out.println((this.left+this.right)/2);
    }
}


public class CalculatorDemo {
    public static void main(String[] args) throws Exception {
        Calculator c1 = new Calculator();
        c1.setCalculator(20, 10);
        c1.sum();
        c1.avg();

        c1.setCalculator(30, 20, 10);
        c1.sum();
        c1.avg();
    }
}

setCalculator(int left,int right)
30
15
setCalculator(int left,int right,int third)
60
25