Instructions

Test suite

Solution

The classical introductory exercise. Just say "Hello, World!".

"Hello, World!" is the traditional first program for beginning programming in a new language or environment.

The objectives are simple:

Write a function that returns the string "Hello, World!".
Run the test suite and make sure that it succeeds.
Submit your solution and check it at the website.

If everything goes well, you will be ready to fetch your first real exercise.

Java Tips

Since this is your first Java exercise, we've included a detailed TUTORIAL.md file that guides you through your solution. Check it out for tips and assistance!

Running the tests

You can run all the tests for an exercise by entering

$ gradle test

in your terminal.

Source

This is an exercise to introduce users to using Exercism http://en.wikipedia.org/wiki/%22Hello,_world!%22_program

Submitting Incomplete Solutions

It's possible to submit an incomplete solution so you can see how others have completed the exercise.

GreeterTest.java

import org.junit.Test;

import static org.junit.Assert.assertEquals;

public class GreeterTest {

    @Test
    public void testThatGreeterReturnsTheCorrectGreeting() {
        assertEquals("Hello, World!", new Greeter().getGreeting());
    }

}

public class HelloWorld {
	public static String hello(String name) {
		if (name == null || name.isEmpty()) {
			return "Hello, World!";
		}
		return String.format("Hello, %s!", name);
	}
}

Community comments

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What can you learn from this solution?

A huge amount can be learned from reading other people’s code. This is why we wanted to give exercism users the option of making their solutions public.

Here are some questions to help you reflect on this solution and learn the most from it.

What compromises have been made?
Are there new concepts here that you could read more about to improve your understanding?

JaeHyoLee's solution

to Hello World in the Java Track