Write a program swap two character in String?

Sure, here is an example program in Java that swaps two characters in a string:

public class StringSwapExample { public static void main(String[] args) { String str = "Hello World"; System.out.println("Before swap: " + str); // Swap characters at positions 1 and 4 str = swapCharacters(str, 1, 4); System.out.println("After swap: " + str); } public static String swapCharacters(String str, int pos1, int pos2) { // Convert the string to a character array char[] charArray = str.toCharArray(); // Swap the characters at the specified positions char temp = charArray[pos1]; charArray[pos1] = charArray[pos2]; charArray[pos2] = temp; // Convert the character array back to a string return new String(charArray); } }

In this program, we first define a string "Hello World" and print it out. Then we call the swapCharacters method to swap the characters at positions 1 and 4 (which are 'e' and 'o', respectively) and store the result back in the original string variable.

The swapCharacters method takes a string, and two integer positions to swap. It converts the string to a character array, swaps the characters at the specified positions using a temporary variable, and then converts the character array back to a string and returns it.