StringReverse.java

package algorithm.basic;

import org.junit.Test;
import utils.Utils;

import static org.hamcrest.CoreMatchers.is;
import static org.junit.Assert.assertThat;

public class StringReverse {

 /*
 TASK
 주어진 문자열을 역순으로 출력한다.
 */

 @Test
 public void test() {
 assertThat(solution1("abc"), is("cba"));
 assertThat(solution1("abcd"), is("dcba"));

 assertThat(solution2("abc"), is("cba"));
 assertThat(solution2("abcd"), is("dcba"));
 }

 // 1. 새로운 배열에 담기
 public String solution1(String str) {
 char[] charArr = str.toCharArray();
 char[] resultArr = new char[charArr.length];

 for (int i = 0; i < charArr.length; i++) {
 resultArr[charArr.length - i - 1] = charArr[i];
 }
 return new String(resultArr);
 }

 // 2. swap하기
 public String solution2(String str) {
 char[] charArr = str.toCharArray();

 for (int i = 0; i < charArr.length / 2; i++) {
 Utils.swapValue(charArr, i, charArr.length - 1 - i);
 }
 return new String(charArr);
 }
}