// 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

*/