객체

package object;

public class Calculator {
	int left, right;

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

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

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

package object;

public class Main {

	public static void main(String[] args) {
		
		      Calculator c1 = new Calculator();
		      c1.setOprands(10, 20);
		      c1.sum();
		      c1.avg();

		      Calculator c2 = new Calculator();
		      c2.setOprands(20, 40);
		      c2.sum();
		      c2.avg();
		  
	}

}