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class Foo(val n: Int) {
override def hashCode = n % 2 // pretty bad hash
override def equals(other: Any): Boolean = other match {
case f: Foo => f.n == n
case _ => false
}
override def toString = "" + n
}
object Test extends App {
val set = new collection.mutable.HashSet[Foo]
// val set = new collection.jcl.HashSet[Foo]
val max = 200
for (x <- 1 to max)
set += new Foo(x)
testRemove(2)
testExists(2)
def testRemove(m: Int) {
for (x <- 1 to max; if x % m == 0) {
val f = new Foo(x)
set -= f
assert(!(set contains f))
testExists(m)
}
}
def testExists(m: Int) {
for (x <- 1 to max; if x % m == 1) {
val f = new Foo(x)
assert(set contains f, "For element: " + f + " set: " + set)
}
}
}
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