java string change character at position code example
Example 1: how to change single character of a string in java
//short answer: you cannot individually change any specific character
//of a String in java. You can however do this:
String s1 = "This is a String";
String s2 = s1.substring(0, 8) + "o" + s1.substring(9);
System.out.println(s2);
//Prints "This is o String", replaced the 8th character with an o
Example 2: java string replace character at position
String str = in.nextLine(); //Original String
char cr = in.next().charAt(0); // character to replace
int index = in.nextInt(); // Index where replaced
str = str.substring(0, index) + cr + str.substring(index + 1);// modified string