12. if Statement Equivalent



Answer:
Of course. Any switch statement can be done with nested ifs .


if Statement Equivalent



    

    

        

    





    
If you need to select among several options based on complicated requirements, use nested if statements, or if else if statements (which are really the same thing.) Here is the previous program, rewritten with equivalent if else if statements.





    





    
        

        

        

            
                
import java.util.Scanner;

class Switcher
{
  public static void main ( String[] args ) throws IOException
  {
    String lineIn;
    char   color  ;    
    String message = "Color is";
    
    Scanner scan = new Scanner( System.in );

    System.out.println("Enter a color letter:");
    lineIn = scan.nextLine();
    color = lineIn.charAt( 0 );  // get the first character

    if      ( color=='r' || color=='R' )    
      message = message + " red" ;

    else if ( color=='o' || color=='O' )               
      message = message + " orange" ;
               
    else if ( color=='y' || color=='Y' )               
      message = message + " yellow" ;
               
    else if ( color=='g' || color=='G' )               
      message = message + " green" ;
               
    else if ( color=='b' || color=='B' )               
      message = message + " blue" ;

    else if ( color=='v' || color=='V' )               
      message = message + " violet" ;

    else 
      message = message + " unknown" ;
            
    System.out.println ( message ) ;
  }
}

            		
        

    









    




Question 12:
Is the program correct? Is == being used correctly?