====== switch ======

The switch statement is a multi-select control structure. An expression is evaluated once and compared to 'constants'. In case of equality, the 'statements' that come after the 'constant' are processed. In switch 'statements' can only ordinary data types (ie, 'int', 'long', char, short, etc.) can be used.

<code java>
switch(expression)
{
   case constant1:
       statements
   break;
 
   case constant2:
       statements
   break;
 
   case constantn:
       statements
   break;
 
   default:
       statements
} 

</code>

===== example of switch in java =====
<code java>
package schoolnotes;
import java.util.Scanner;

public class Schoolnotes{


    public static void main(String[] args) {
        
        int note;
        Scanner scan = new Scanner(System.in);
        
        System.out.print("Please enter a note: ");
        note = scan.nextInt();
        
        switch(note) {
        
            case 1: System.out.println("very well");
                break;
            case 2: System.out.println("good");
                break;
            case 3: System.out.println("satisfactory");
                break;
            case 4: System.out.println("sufficient");
                break;
            case 5: System.out.println("deficient");
                break;
            case 6: System.out.println("insufficient");
                break;
            default: System.out.println("Not a valid note");
        }
        
    }
}
</code>

=== output ===
    Please enter a note: 2
    good