how to add special character to All Lines in EditText or in String?

i hope you are fine.
i want a way to add a special character to begenning of every new Line (to the line break), for example i have this text line by line :

Paragraphs are the building blocks of papers. 
Many students define paragraphs in terms of length. 
a paragraph is a group of at least five sentences. 
a paragraph is half a page long, etc. In reality. 
though, the unity and coherence of ideas among. 
sentences is what constitutes a paragraph. 

and i want it to be like this (with "-" in every beginning of line) :

-Paragraphs are the building blocks of papers. 
-Many students define paragraphs in terms of length. 
-a paragraph is a group of at least five sentences. 
-a paragraph is half a page long, etc. In reality. 
-though, the unity and coherence of ideas among. 
-sentences is what constitutes a paragraph. 

and this is my small code :

String string = edittext1.getText().toString();

//here i want to add code for adding a "special character like -+*" in every new line

textview1.setText(string);

and thank you in advance.

Honestly, you should just be editing the strings directly, but in this case, maybe make a third-string and for that string concatenate the individual lines of text as strings with a string that contains "-" so now you can print your desired strings one line at a time with \n to separate the lines.

Here is a simple way to do that

    String string = edittext1.getText.toString; 

    StringBuilder result = new StringBuilder(); 

    String[] array = string.split("\\n"); 

    for(String line : array){ 
         result.append("-").append(line).append("\n"); 

          }

    textview1.setText(result);

You can achieve this by replacing the charSequence with new one as you want.

Kotlin Code Example
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.text/replace.html

Java Code Example
https://www.javatpoint.com/java-string-replace