if-else

• Basic form of conditional control flow.

    if (boolean-expression)
       statement1
    else
       statement2
  

• Example

    class IfElse1 {
       public static void main (String[] args) {
       int i = 10;
       if ( i==1 )
          System.out.println( "i == 1" );
       else if ( i==2 )
          System.out.println( "i == 2" );
       else if ( i==3 )
          System.out.println( "i == 3" );
       else
          System.out.println( "don't know what 'i' is" );
       }
    }