How to replace comma with New line number in Java?

I need to replace every comma in a string to new line with number in it.

String str = "Peter, Bob, Chester, Mike";

I have done for replacing comma with new line.

str = str.replace(",", "\n");

This give me output like this

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Peter
Bob
Chester
Mike

What I’m wanted to do is

1. Peter
2. Bob
3. Chester
4. Mike

*The requirement need string not a array.

>Solution :

you can use the split (which splits the String into a string array) method like so and use a forEach loop:

    int counter=0;

    for(String s:str.split(",")){
        System.out.println(counter+". "+s);
        counter++;
    }

Hope it helps.