A String is an object that represents an immutable sequence of characters and cannot be changed once created. The java.lang.String class can be used to create a string object.
In the below program, we can sort the characters of a string without using any predefined methods of String class in Java.
Example
public class SortStringWithoutPredefinedMethodsTest { public static void main(String[] args) { String str = "jdkoepacmbtr"; System.out.println("Before Sorting:" + str); int j = 0; char temp = 0; char[] chars = str.toCharArray(); for(int i=0; i < chars.length; i++) { for(j=0; j < chars.length; j++) { if(chars[j] > chars[i]) { temp = chars[i]; chars[i] = chars[j]; chars[j] = temp; } } } System.out.println("After Sorting:"); for(int k=0; k < chars.length; k++) { System.out.println(chars[k]); } } }
Output
Before Sorting: jdkoepacmbtr After Sorting: a b c d e j k m o p r t