Lesson 15: String Array - Intro to Java

String Array Make an array of words.

1import java.util.Arrays;

3public static void main(String[] args) {

4 String[] arr = {"hello", "world", "!"};

5 System.out.println(Arrays.toString(arr));

Terminal

$ javac Main.java

$ java Main

[hello, world, !]

Every line, explained

import java.util.Arrays;: import lines go at the very top of a Java file and bring in extra tools. java.util.Arrays is a helper class full of useful methods for working with arrays; we need it for Arrays.toString below.
public static void main(String[] args) {: Every Java program starts at the main method. When you run the program, Java looks for this exact line, public static void main(String[] args), and runs everything between its { and } from top to bottom.
String[] arr = {"hello", "world", "!"};: String[] declares an array of text values. Each String still needs its own double quotes. arr[0] is "hello", arr[1] is "world" and arr[2] is "!".
System.out.println(Arrays.toString(arr));: Careful: printing an array directly, System.out.println(arr), does NOT show its contents in Java! It prints a strange code like [I@1b6d3586 (the exact letters depend on the array's type). Arrays.toString(arr) converts the array into readable text like [1, 2, 3] first, and that is what we print.
}: This closing curly brace } ends the main method. In Java every opening brace { must have a matching closing brace }.