Thread: Having problems understanding String Methods

I'm not sure if I'm using the replaceAll method correctly. Based on the example below, if I'm using Public String replaceAll method, do I need to use " around each string inside the parenthesis? Am I using the method correctly?

Example/:
exampleString = "Hello, Jenn. How are you, Jenn?";
exampleString = exampleString.replaceAll("Jenn", "Kim");

I want to change the string to substitute Kim for Jenn. I'm confused because my textbook is telling me that string are immutable, or can't be changed. Do I have to assign a new name to my string entirely or will my example above work? If it works, how can a string be immutable but allow me to alter it?

i couldn't figure out how to get it to work like you said but you could do it like this...I'm also not sure how you are getting the name (from a console input maybe?)

String s; 
		s = "Jenn";
		System.out.printf("Hello, %s. How are you, %s?\n", s, s);
 
		s = "Kim";
		System.out.printf("Hello, %s. How are you, %s?", s, s);

well i was playing around with it and this works...refined it lol

		String s = "Hello Jenn";
		System.out.println(s);
		System.out.println(s.replaceAll("Jenn", "Kim"));

i learned something new from this and hopefully you did too

String s; 
		s = "Jenn";
		System.out.printf("Hello, %s. How are you, %s?\n", s, s);
 
		s = "Kim";
		System.out.printf("Hello, %s. How are you, %s?", s, s);

I can't use the example above as the string that I'm working with is user inputed, so I don't know the values that I'm trying to replace until they tell me.

		String s = "Hello Jenn";
		System.out.println(s);
		System.out.println(s.replaceAll("Jenn", "Kim"));

I'm still new at this, so bear with me. In this example, you are printing the original string and then printing the string with the replacement of Kim for Jenn, correct? Can I do this without the print by just assigning the value to the string like so:
s = s.replaceAll("Jenn","Kim");

Also, any idea why my book is telling me that I can't reassign a value to a string? I'm not sure that I understand that.

thats correct i printed both just to show that it changed the name..ah yes the s = s.replaceAll("Jenn", "Kim");
works outside the println you are correct

also if you are getting the names from user input you should probably store the names as variables and use the variables instead of "Jenn" and "Kim" unless one or both of those never changes

sorry forgot about the second part of your question

im not sure why its saying you cant reassign a value to it...maybe its not good practice to do that?

If I'm using a named variable for the string target and string replacement, I do not need the quotes, correct?

nope you dont need the quotes

say you have 2 variables name1 and name2
example: s = s.replaceAll(name1, name2);