Java 8 coding challenge: Toggle String

Problem:

You have been given a String  consisting of uppercase and lowercase English alphabets. You need to change the case of each alphabet in this String. That is, all the uppercase letters should be converted to lowercase and all the lowercase letters should be converted to uppercase. You need to then print the resultant String to output.

Input Format
The first and only line of input contains the String 

Output Format
Print the resultant String on a single line.

Constraints
$1\le |S|\le 100$ where $|S|$ denotes the length of string $S$.

SAMPLE INPUT

abcdE

SAMPLE OUTPUT

ABCDe

Code:

import java.util.Scanner;
import java.lang.StringBuilder;
 
class TestClass {
 public static void main(String args[] ) throws Exception {
 Scanner sc= new Scanner(System.in);
 String s,s1,sx;
 char[] temp=new char[100];
 s=sc.nextLine();
 int x=s.length();
 for(int i=0;i<x;i++){
 char c = s.charAt(i);
 s1=Character.toString(c);
 if(Character.isLowerCase(c)){
 sx=s1.toUpperCase();
 temp[i]=sx.charAt(0);
 }
 else if(Character.isUpperCase(c)){
 
 sx=s1.toLowerCase();
 temp[i]=sx.charAt(0);
 }
 else{
 temp[i]=c;
 }
 }
 String s2= new String(temp);
 s2=s2.substring(0,x);
 System.out.println(s2);
 }
}