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        <title>문제를 잘 정의하는 것은 문제를 절반 해결한 것이다. - 2023.12 wiki:miscellaneous:doublecolonoperator</title>
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        <description>Lamda and Double Colon Operator

	*  description : Lamda and Double Colon Operator
	*  author      : 오션
	*  email       : shlim@repia.com
	*  lastupdate  : 2022-03-11

Lamda and Double Colon Operator


interface Calculator {
// 두 개의 정수를 입력받고, 결과값을 리턴하는 sum 함수를 정의한 Calculator 인터페이스
   int sum(int a, int b);
}

class MyCalculator implements Calculator 
// 자식 클래스 MyCalculator는 인터페이스인 부모 클래스 Calculator를 구현한다.
   public int sum(int a, int b) {
      return a + b;
   }
}

public class Sample {
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