// equalshashcode/Equality.java
// (c)2017 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
import java.util.*;

public class Equality {
 protected int i;
 protected String s;
 protected double d;
 public Equality(int i, String s, double d) {
 this.i = i;
 this.s = s;
 this.d = d;
 System.out.println("made 'Equality'");
 }
 @Override
 public boolean equals(Object rval) {
 if(rval == null)
 return false;
 if(rval == this)
 return true;
 if(!(rval instanceof Equality))
 return false;
 Equality other = (Equality)rval;
 if(!Objects.equals(i, other.i))
 return false;
 if(!Objects.equals(s, other.s))
 return false;
 if(!Objects.equals(d, other.d))
 return false;
 return true;
 }
 public void
 test(String descr, String expected, Object rval) {
 System.out.format("-- Testing %s --%n" +
 "%s instanceof Equality: %s%n" +
 "Expected %s, got %s%n",
 descr, descr, rval instanceof Equality,
 expected, equals(rval));
 }
 public static void testAll(EqualityFactory eqf) {
 Equality
 e = eqf.make(1, "Monty", 3.14),
 eq = eqf.make(1, "Monty", 3.14),
 neq = eqf.make(99, "Bob", 1.618);
 e.test("null", "false", null);
 e.test("same object", "true", e);
 e.test("different type",
 "false", Integer.valueOf(99));
 e.test("same values", "true", eq);
 e.test("different values", "false", neq);
 }
 public static void main(String[] args) {
 testAll( (i, s, d) -> new Equality(i, s, d));
 }
}
/* Output:
made 'Equality'
made 'Equality'
made 'Equality'
-- Testing null --
null instanceof Equality: false
Expected false, got false
-- Testing same object --
same object instanceof Equality: true
Expected true, got true
-- Testing different type --
different type instanceof Equality: false
Expected false, got false
-- Testing same values --
same values instanceof Equality: true
Expected true, got true
-- Testing different values --
different values instanceof Equality: true
Expected false, got false
*/