(Sort characters in a string) Write a method that returns a sorted string using the following header:

/*********************************************************************************
* (Sort characters in a string) Write a method that returns a sorted string      *
* using the following header:                                                    *
*                                                                                *
* public static String sort(String s)                                            *
*                                                                                *
* For example, sort("acb") returns abc.                                          *
* Write a test program that prompts the user to enter a string and displays the  *
* sorted string.                                                                 *
*********************************************************************************/
import java.util.Scanner;

public class Exercise_07_34 {
	/** Main method */
	public static void main(String[] args) {
		Scanner input = new Scanner(System.in);

		// Prompt the user to enter a string
		System.out.print("Enter a string: ");
		String string = input.nextLine();

		// Display the sorted string
		System.out.println(sort(string));
	}

	/** sort sorts string */
	public static char[] sort(String s) {
		char[] str = new char[s.length()]; // Create char array

		// Fill array with the elements of the string
		for (int i = 0; i < str.length; i++)
			str[i] = s.charAt(i); 

		// Sort array
		for (int i = 0; i < str.length - 1; i++) {
			char min = str[i];
			int minIndex = i;

			for (int j = i + 1; j < str.length; j++) {
				if (min > str[j]) {
					min = str[j];
					minIndex = j;
				}
			}
			if (minIndex != i) {
				str[minIndex] = str[i];
				str[i] =  min;
			}
		}
		return str;
	}
}