Polymorphic copy: Difference between revisions

=={{header|Groovy}}==

{{trans|Java}} (more or less)

Solution:

<lang groovy>class T implements Cloneable {

String property

String name() { 'T' }

T copy() {

try { super.clone() }

catch(CloneNotSupportedException e) { null }

}

@Override

boolean equals(that) { this.name() == that?.name() && this.property == that?.property }

}

class S extends T {

@Override String name() { 'S' }

}</lang>

Test:

<lang groovy>T obj1 = new T(property: 'whatever')

S obj2 = new S(property: 'meh')

def objA = obj1.copy()

def objB = obj2.copy()

assert objA.class == T

assert objA == obj1 && ! objA.is(obj1) // same values, not same instance

assert objB.class == S

assert objB == obj2 && ! objB.is(obj2) // same values, not same instance

println "objA:: name: ${objA.name()}, property: ${objA.property}"

println "objB:: name: ${objB.name()}, property: ${objB.property}"</lang>

Output:

<pre>objA:: name: T, property: whatever

objB:: name: S, property: meh</pre>