CommentsDemo.java

//This is an example comment, notice how the compiler ignores it
//There are two slashes(//) at the beginning of the line
//The slashes denote that this is a comment

public class CommentsDemo {
    public static void main(String[] args) {
        //System.out.println("I will show when am commented out"); 
        //Run it, try removing the two slashes and run again
        
        /*
        This is a block comment, its very useful 
        when describing in detail what the code is doing
        Am going to use it below to describe what the program is doing
        */
       
        /*
        int[] numbers = {1,2,3,4,5,6,7,8,9,10};
        int sum = 0;
        for(int number : numbers){
            sum = sum + number;
        }
        System.out.println("Total " + sum);
        */
        
        //Uncomment the above block comment and Run again.
        
        //Observe how block comments are useful for commenting out
        //a huge portion of code. This is useful for debugging
    }
}