OnJava8-Examples/equalshashcode/ComposedEquality.java at master · CSapprenticeWT/OnJava8-Examples · GitHub

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// equalshashcode/ComposedEquality.java

// We make no guarantees that this code is fit for any purpose.

// Visit http://OnJava8.com for more book information.

import java.util.*;

class Part {

String ss;

double dd;

Part(String ss, double dd) {

this.ss = ss;

this.dd = dd;

}

@Override public boolean equals(Object rval) {

return rval instanceof Part &&

Objects.equals(ss, ((Part)rval).ss) &&

Objects.equals(dd, ((Part)rval).dd);

}

public class ComposedEquality extends SuccinctEquality {

Part part;

public ComposedEquality(int i, String s, double d) {

super(i, s, d);

part = new Part(s, d);

System.out.println("made 'ComposedEquality'");

}

@Override public boolean equals(Object rval) {

return rval instanceof ComposedEquality &&

super.equals(rval) &&

Objects.equals(part,

((ComposedEquality)rval).part);

}

public static void main(String[] args) {

Equality.testAll( (i, s, d) ->

new ComposedEquality(i, s, d));

}

/* Output:

made 'Equality'

made 'SuccinctEquality'

made 'ComposedEquality'

made 'Equality'

made 'SuccinctEquality'

made 'ComposedEquality'

made 'Equality'

made 'SuccinctEquality'

made 'ComposedEquality'

-- 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

OnJava8-Examples/equalshashcode/ComposedEquality.java at master · CSapprenticeWT/OnJava8-Examples · GitHub

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