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Rooted by: Reverse the given string.
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  • Code 
    //import java.util.Scanner;
import java.lang.StringBuilder;

public class Practice01{
	public static String reverse(String input) {
		/*Scanner sc = new Scanner(System.in);
		System.out.println("Give the desired string to be reversed :");
		String e = sc.nextLine();*/
    return new StringBuilder(input).reverse().toString();
	}
}
    Test Cases 
    import static org.junit.Assert.*;
import org.junit.Test;

// TODO: Replace examples and use TDD by writing your own tests
public class Practice01Test {

    private static void testing(String actual, String expected) {
        assertEquals(expected, actual);
    }
    @Test
    public void test() {
        testing("!ereht olleH" , Practice01.reverse("Hello there!"));
    }
}
    View Run Output
  • Code
    • //import java.util.Scanner;
    • import java.lang.StringBuilder;
    • public class Practice01{
    • public static String reverse(String input) {
    • /*Scanner sc = new Scanner(System.in);
    • System.out.println("Give the desired string to be reversed :");
    • String e = sc.nextLine();*/
    • String result = "";
    • for(int i = input.length() - 1; i >= 0; i --){
    • result += input.substring(i , i + 1);
    • }
    • return result;
    • return new StringBuilder(input).reverse().toString();
    • }
    • }