Parameter... (ellipsis)

간단하게 한 문장으로 Variable-Length Argument Lists (즉, 파라미터를 몇개를 받아도 처리가 가능한 녀석)라고 한다.

예제코드

package honeymon.java.study;

import org.junit.Test;
import static org.junit.Assert.*;
import static org.hamcrest.CoreMatchers.*;

public class TestEllipsis {
    @Test
    public void testEllipsis() {
	assertThat(lengthEllipsis(3, 4, 5, 6), is(4));
	assertThat(countEllipsis(2, 3, 4, 5, 6), is(20));
	assertThat(stringEllipsis("Korea", "Japan", "China"), is("Korea is Strong country."));
    }

    private String stringEllipsis(String...national) {
	String stmt = null;
	for (int i = 0; i < national.length; i++ ){
	    if("Korea".equals(national[i])) {
		stmt = national[i] + " is Strong country.";
	    }
	}
	return stmt;
    }

    private Integer countEllipsis(int... numberArray) {
	int sumresult = 0;
	for (int i = 0; i < numberArray.length; i++) {
	    sumresult += numberArray[i];
	}
	return sumresult;
    }

    private Integer lengthEllipsis(int... number) {
	return number.length;
    }
    
}

https://java.ihoney.pe.kr/155