Вывод строки после определенного символа

public class Main
{
public static void main(String[] args){
String sentence = "";
int lenght = sentence.length();
String myCha = "";
String mySt = "";
InputStreamReader is = new InputStreamReader(System.in);
BufferedReader bis = new BufferedReader(is);
try
{
System.out.println("Введи текст: ");
sentence = bis.readLine();
System.out.println("После какого символа:");
myCha = bis.readLine();
System.out.println("Какая подстрока:");
mySt = bis.readLine();
}
catch (IOException e)
{
e.printStackTrace();
}
Text myText = new Text(myCha, sentence, mySt);
myText.changeSentence();
System.out.println("Новая строка" + myText.getSentence());
}}
class Text
{
private String mySentence;
private String myStr;
private String myChar;
private String newSentence = "";
public Text(String myStr, String myChar, String mySentece) {
this.mySentence = mySentece;
this.myStr = myStr;
this.myChar = myChar; 
}
public String getSentence()
{
return newSentence;
}
public void changeSentence ()
{
    int firstPos = 0;
    int i ,n;
    for (i = 0; i < mySentence.length(); i++) {
        n = mySentence.indexOf(myChar);
        if (n!=-1){
        newSentence = newSentence.concat(myChar+" "); }
    }
   }}