Java enum: Demonstrate ordinal(), compareTo(), and equals(). : Enum « Language Basics « Java





Java enum: Demonstrate ordinal(), compareTo(), and equals().

Java enum: Demonstrate ordinal(), compareTo(), and equals().
  

/*
Java 2, v5.0 (Tiger) New Features
by Herbert Schildt
ISBN: 0072258543
Publisher: McGraw-Hill/Osborne, 2004
*/
//  
 
// An enumeration of apple varieties. 
enum Apple {  
  Jonathan, GoldenDel, RedDel, Winsap, Cortland 
} 
 
public class EnumDemo4 { 
  public static void main(String args[])  
  { 
    Apple ap, ap2, ap3; 
 
    // Obtain all ordinal values using ordinal(). 
    System.out.println("Here are all apple constants" + 
                       " and their ordinal values: "); 
    for(Apple a : Apple.values()) 
      System.out.println(a + " " + a.ordinal()); 
 
    ap =  Apple.RedDel; 
    ap2 = Apple.GoldenDel; 
    ap3 = Apple.RedDel; 
 
    System.out.println(); 
 
    // Demonstrate compareTo() and equals() 
    if(ap.compareTo(ap2) < 0) 
      System.out.println(ap + " comes before " + ap2); 
 
    if(ap.compareTo(ap2) > 0) 
      System.out.println(ap2 + " comes before " + ap); 
 
    if(ap.compareTo(ap3) == 0) 
      System.out.println(ap + " equals " + ap3); 
   
    System.out.println(); 
 
    if(ap.equals(ap2)) 
      System.out.println("Error!"); 
 
    if(ap.equals(ap3)) 
      System.out.println(ap + " equals " + ap3); 
 
    if(ap == ap3) 
      System.out.println(ap + " == " + ap3); 
 
  } 
}           
         
    
  










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