2. 대소문자 변환 import java.util.Scanner; public class Change { public static void main(String[] args) { Scanner scan = new Scanner(System.in); String str = scan.next(); System.out.println(solution(str)); } public static String solution(String str) { String answer = ""; for( char x : str.toCharArray()) { if ( Character.isLowerCase(x) ) { answer += Character.toUpperCase(x); }else { answer += Character..