put particular character in string java 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: add one character to string java

char ch='A';
String str="pple";
str= ch+str;   // str will change to "Apple"