Replace a character with a string

ReplaceCharacter.java

public class ReplaceCharacter {

    public static String stringReplacer(String str,char source,String replaced){
        StringBuilder dest = new StringBuilder();
        
        for(int i = 0;i<str.length();i++){
            char ch = str.charAt(i);
            if(ch==source){
                dest.append(replaced);
                
            }
            else{
                dest.append(ch);
                
            }
        }
        return dest.toString();
    }    
    
    
    public static void main(String[] args) {
	
        System.out.println("reverse string");
        String word = "Hello world";
        String word2 = "Hello wordl";
        System.out.println(stringReplacer(word,' ', word2));
    }
}