Leaving comments in our Java code

In programming, it is always a clever idea to write notes, known as code comments, and sprinkle them liberally throughout your code. This is to remind us what we were thinking at the time we wrote the code. To do this, you simply append a double forward slash and then type your comment, as follows:

// This is a comment and it could be useful

In addition, we can use comments to comment out a line of code. Suppose we have a line of code that we temporarily want to disable. We can do so by adding the two forward slashes, like this:

// The code below used to send a message
// Log.i("info","our message here");
// But now it doesn't do anything
// And I am getting ahead of where I should be

Note

Using comments to comment out code should only be a temporary measure. Once you have found the correct code to use, commented-out code should be deleted to keep the code file clean and organized.

Let's look at two separate ways to send messages in Android, and then we can write some methods that will send messages when our new UI buttons are pressed.