Java Comments

Comments can be used to explain Java code and make it more readable. They can also be used to prevent execution when testing alternative code.

Single-line Comments

Single-line comments start with two forward slashes (//).

Any text between // and the end of the line is ignored by Java (it will not be executed).

This example uses a single-line comment before a line of code:

// This is a comment
System.out.println("Hello World");

This example uses a single-line comment at the end of a line of code:

System.out.println("Hello World"); // This is a comment

Multi-line comments start with /* and end with */.

Any text between /* and */ will be ignored by Java.

This example uses a multi-line comment (a comment block) to explain the code:

/* The code below will print the words Hello World
   to the screen, and it is amazing */
System.out.println("Hello World");

It's up to you which one you use. Normally, we use // for short comments and /* */ for longer ones.