String Methods Part 2

Part of the Fundamentals section of Coddy's Java journey — lesson 68 of 73.

String splitting allows you to break a string into an array, while joining lets you combine array items into a string.

The .split() method divides a string into an array of substrings based on a delimiter.

Split by whitespace:

String text = "apple banana cherry";
String[] fruits = text.split(" ");
System.out.println(Arrays.toString(fruits));
// ["apple", "banana", "cherry"]

Split with specific delimiter:

String data = "john,25,new york";
String[] dataArr = data.split(",");
System.out.println(Arrays.toString(dataArr));
// ["john", "25", "new york"]

The String.join() method combines elements of an iterable into a single string.

Basic joining:

String[] words = {"Hello", "World", "Java"};
String text = String.join(" ", words);
System.out.println(text);
// "Hello World Java"

Join with different separator:

String[] fruits = {"apple", "banana", "cherry"};
String line = String.join(",", fruits);
System.out.println(line);
// "apple,banana,cherry"

Challenge

Easy

Write a program that takes two inputs: a text string and a delimiter character. The program should replace all single spaces (" ") in the text with the specified delimiter and print the modified string.

Cheat sheet

The .split() method divides a string into an array based on a delimiter:

String text = "apple banana cherry";
String[] fruits = text.split(" ");
// ["apple", "banana", "cherry"]

String data = "john,25,new york";
String[] dataArr = data.split(",");
// ["john", "25", "new york"]

The String.join() method combines array elements into a single string:

String[] words = {"Hello", "World", "Java"};
String text = String.join(" ", words);
// "Hello World Java"

String[] fruits = {"apple", "banana", "cherry"};
String line = String.join(",", fruits);
// "apple,banana,cherry"

Try it yourself

import java.util.Arrays;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String text = scanner.nextLine();
        String delimiter = scanner.nextLine();
        // Write your code below
    }
}