how to replace ? with a character in string java code example

Example 1: java replace character

// We want to replace every # with a 8
String larry = "Larry is # years old";
String newString = larry.replace("#", "8");

Example 2: how to replace a character with another character in a string in java

public class JavaExample{
   public static void main(String args[]){
	String str = new String("Site is BeginnersBook.com");

	System.out.print("String after replacing com with net :" );
	System.out.println(str.replaceFirst("com", "net"));

	System.out.print("String after replacing Site name:" );
	System.out.println(str.replaceFirst("Beginners(.*)", "XYZ.com"));
   }
}