/**
 * This is some code to illustrate the difference between equals and
 * ==.  Interning is also illustrated.
 *
 *
 * @author Benjamin Shults
 */

public class Equals {
  
  public static void main(String[] args) {
   // String greet2 = "Hello";
    String greet = new String("Hello");
    String salute = new String("Hello");
    String temp = salute;

    System.out.println("Initially:");

    System.out.println(greet + ((greet == salute) ? " == " : " != ") + salute);

    if (greet.equals(salute))
      System.out.println(greet + " equals " + salute);
    else
      System.out.println(greet + " not equals " + salute);

    salute = greet;

//    Add stuff here about Boolean.valueOf, Integer.valueOf, and the
//    interning/efficiency issues related to that.

    System.out.println("After salute = greet:");

    if (greet == salute)
      System.out.println(greet + " == " + salute);
    else
      System.out.println(greet + " != " + salute);

    salute = temp.intern();

    System.out.println("After salute = temp.intern():");
    // This shows that there are actually three different String
    // objects floating around.
    if (greet == salute)
      System.out.println(greet + " == " + salute);
    else
      System.out.println(greet + " != " + salute);

    greet = greet.intern();

    System.out.println("After greet = greet.intern():");

    if (greet == salute)
      System.out.println(greet + " == " + salute);
    else
      System.out.println(greet + " != " + salute);

    if ("Hello" == salute)
      System.out.println("Hello == " + salute);
    else
      System.out.println("Hello != " + salute);

    if ("Hello" == temp)
      System.out.println("Hello == " + salute);
    else
      System.out.println("Hello != " + salute);

    if ("Hello" == "Hello")
      System.out.println("Hello == Hello");
    else
      System.out.println("Hello != Hello");

    if ("Hello".equals("Hello"))
      System.out.println("Hello equals Hello");
    else
      System.out.println("Hello is not equal to Hello");
  }
  
} // Equals