77 lines
2.1 KiB
Java
77 lines
2.1 KiB
Java
// equalshashcode/Equality.java
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// (c)2021 MindView LLC: see Copyright.txt
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// We make no guarantees that this code is fit for any purpose.
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// Visit http://OnJava8.com for more book information.
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import java.util.*;
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public class Equality {
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protected int i;
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protected String s;
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protected double d;
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public Equality(int i, String s, double d) {
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this.i = i;
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this.s = s;
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this.d = d;
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System.out.println("made 'Equality'");
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}
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@Override public boolean equals(Object rval) {
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if(rval == null)
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return false;
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if(rval == this)
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return true;
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if(!(rval instanceof Equality))
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return false;
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Equality other = (Equality)rval;
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if(!Objects.equals(i, other.i))
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return false;
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if(!Objects.equals(s, other.s))
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return false;
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if(!Objects.equals(d, other.d))
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return false;
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return true;
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}
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public void
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test(String descr, String expected, Object rval) {
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System.out.format("-- Testing %s --%n" +
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"%s instanceof Equality: %s%n" +
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"Expected %s, got %s%n",
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descr, descr, rval instanceof Equality,
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expected, equals(rval));
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}
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public static void testAll(EqualityFactory eqf) {
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Equality
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e = eqf.make(1, "Monty", 3.14),
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eq = eqf.make(1, "Monty", 3.14),
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neq = eqf.make(99, "Bob", 1.618);
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e.test("null", "false", null);
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e.test("same object", "true", e);
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e.test("different type",
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"false", Integer.valueOf(99));
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e.test("same values", "true", eq);
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e.test("different values", "false", neq);
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}
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public static void main(String[] args) {
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testAll( (i, s, d) -> new Equality(i, s, d));
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}
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}
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/* Output:
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made 'Equality'
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made 'Equality'
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made 'Equality'
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-- Testing null --
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null instanceof Equality: false
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Expected false, got false
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-- Testing same object --
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same object instanceof Equality: true
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Expected true, got true
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-- Testing different type --
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different type instanceof Equality: false
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Expected false, got false
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-- Testing same values --
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same values instanceof Equality: true
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Expected true, got true
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-- Testing different values --
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different values instanceof Equality: true
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Expected false, got false
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*/
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